docs: clarify signature byte cap comment is Stalwart-specific

In the dark theme --color-border was #262626, identical to --color-secondary/--color-muted. The global `* { border-color: var(--color-border) }` rule therefore rendered borders invisible on those surfaces - e.g. the folder sidebar's right border and the account header's bottom border vanished in dark mode.

Set --color-border to rgba(128, 128, 128, 0.3) (the same neutral the navigation rail already uses inline) so borders stay visible and consistent across all dark surfaces (background, secondary, card, popover).

.env.dev.example

@@ -47,3 +47,8 @@ LOG_LEVEL=debug
 # LOGIN_IMPRINT_URL=https://example.com/imprint
 # LOGIN_PRIVACY_POLICY_URL=https://example.com/privacy
 # LOGIN_WEBSITE_URL=https://example.com
+
+# Per-domain branding overrides. Each entry must have "host" (exact or
+# "*.subdomain" wildcard) plus any subset of branding fields to override.
+# Unset fields fall through to the global values above.
+# DOMAIN_BRANDING=[{"host":"localhost","loginCompanyName":"Local Dev"}]

.env.example

@@ -49,6 +49,11 @@ JMAP_SERVER_URL=https://your-jmap-server.com
 # OpenID Connect issuer URL for discovery
 # OAUTH_ISSUER_URL=https://your-idp.example.com
 
+# Allow OAuth discovery to resolve to private (RFC-1918 / loopback) addresses.
+# Off by default as an SSRF guard. Enable for split-DNS deployments where the
+# OAuth issuer's public hostname resolves to an internal IP from this server.
+# OAUTH_ALLOW_PRIVATE_ENDPOINTS=true
+
 # =============================================================================
 # Session & Security
 # =============================================================================
@@ -220,6 +225,29 @@ LOGIN_COMPANY_NAME=Bulwark Webmail
 # URL for the company website link on the login page.
 LOGIN_WEBSITE_URL=https://bulwarkmail.org
 
+# ---------------------------------------------------------------------------
+# Per-domain branding overrides (optional)
+# ---------------------------------------------------------------------------
+#
+# When you serve the webmail on multiple hostnames, each hostname can override
+# a subset of branding fields. Unset fields fall back to the global values
+# above. Match is on the request's Host (or X-Forwarded-Host) header.
+#
+# Use the leftmost label "*." to match any subdomain (e.g. "*.example.com"
+# matches mail.example.com and any deeper subdomain, but NOT example.com).
+# Exact matches always win over wildcards; the longest wildcard suffix wins
+# among multiple wildcard matches.
+#
+# Overridable keys: appName, appShortName, appDescription, faviconUrl,
+# pwaIconUrl, pwaThemeColor, pwaBackgroundColor, appLogoLightUrl,
+# appLogoDarkUrl, loginLogoLightUrl, loginLogoDarkUrl, loginCompanyName,
+# loginImprintUrl, loginPrivacyPolicyUrl, loginWebsiteUrl.
+#
+# Prefer setting this from the admin dashboard (PATCH /api/admin/config).
+# The env-var form is provided for stateless deployments.
+#
+# DOMAIN_BRANDING=[{"host":"maildomain1.com","loginCompanyName":"Company One","loginLogoLightUrl":"/branding/one-color.svg","loginLogoDarkUrl":"/branding/one-white.svg","loginWebsiteUrl":"https://one.example"},{"host":"maildomain2.com","loginCompanyName":"Company Two","faviconUrl":"/branding/two-favicon.svg"},{"host":"*.intranet.example.com","loginCompanyName":"Internal"}]
+
 # =============================================================================
 # Extension Directory / Marketplace
 # =============================================================================
@@ -229,6 +257,22 @@ LOGIN_WEBSITE_URL=https://bulwarkmail.org
 # your own directory (e.g. http://localhost:3001 for local development).
 # EXTENSION_DIRECTORY_URL=https://extensions.bulwarkmail.org
 
+# =============================================================================
+# Internationalization
+# =============================================================================
+# These are build-time variables - to change them with the published Docker
+# image, rebuild it with --build-arg (see README "Default UI locale").
+#
+# Fallback UI locale used when the visitor's Accept-Language header does not
+# match any supported locale. Defaults to "en".
+# Supported: cs, da, de, en, es, fr, it, ja, ko, lv, nl, pl, pt, ru, tr, uk, zh
+# NEXT_PUBLIC_DEFAULT_LOCALE=tr
+
+# Locale prefix mode for URLs. Recommended "always" when proxying under a
+# subpath (NEXT_PUBLIC_BASE_PATH) to avoid next-intl rewrite loops.
+# Values: never (default) | always | as-needed
+# NEXT_PUBLIC_LOCALE_PREFIX=always
+
 # =============================================================================
 # Legacy Build-time Variables (still supported as fallback)
 # =============================================================================

CHANGELOG.md

@@ -1,5 +1,96 @@
 # Changelog
 
+## 1.7.3 (2026-06-04)
+
+### Features
+
+- **Mail**: Inline attachment preview — reliable MIME detection with inline PDF on desktop and mobile
+- **Mail**: Preview composer attachments inline (click to open)
+- **Mail**: Preview `.eml` (`message/rfc822`) attachments like an email
+- **Mail**: Read receipts (MDN, RFC 8098)
+- **Mail**: Editable, layout-preserving quote island when replying
+- **Mail**: Surface the most severe SPF result and hide the "via" badge on spoofed mail
+- **Calendar**: Per-viewer colors for shared calendars (#345)
+- **Filters**: Extended filter rules — attachment field and multi-value conditions
+- **Settings**: New built-in themes — Aurora Glass and Elastic
+- **Settings**: Theme cards render as a mini mailbox mockup from theme colors, with light/dark variant chips
+- **Plugins**: Localizable sandboxed plugins (manifest locales + `api.i18n.t`)
+- **Plugins**: `/api/translate` proxy and email body exposed to plugins
+- **Admin**: Toggle for search-engine indexing (robots)
+- **Admin**: `passwordHashFile` in `admin.json`
+- **Admin**: `sessionSecretFile` and `oauthClientSecretFile` for file-based secrets in JSON config
+- **PWA**: Configurable install screenshots (per-domain)
+- **i18n**: Hungarian locale support
+
+### Fixes
+
+- **Files**: Store Files as real `FileNode` hierarchy, migrate legacy flat-named files on load, and list folders via `FileNode/get` so they are visible (#379)
+- **Files**: Treat a blob-less `FileNode` as the only folder signal and migrate legacy dir-markers
+- **Mail**: Empty Trash for shared and group folders (#387)
+- **Mail**: Move mail from a shared group inbox to a personal inbox (#375)
+- **Mail**: Preserve the HTML signature when sending a quick reply
+- **Mail**: Stop body clipping under the fold when the email sets `html`/`body` `height: 100%`
+- **Mail**: Drop single-letter `R:`/`I:` subject prefix tokens and deduplicate localized reply/forward prefixes
+- **Mail**: No more 404 console spam for missing sender favicons
+- **Auth**: Discover OIDC metadata server-side to avoid CORS failures (#382)
+- **Send**: Route the Sent copy to the shared-mailbox account on per-identity send
+- **Routing**: Honour `basePath` in the plugin sandbox, `http.post` proxy, and branding
+- **i18n**: Localize the PWA install prompt, reply/forward quote header (incl. sender address), `<html lang>`, and per-locale `<head>` description; add missing `settings.folders.role_memos` key
+- **Themes**: Plugin slot iframes inherit host font and color tokens
+- **Theme**: Gate preview "open in new tab" on inline-safe MIME types
+- **Appearance**: Move Themes settings into the Appearance category with a distinct tab icon; clicking the active theme is a no-op
+- **UI**: Fix invisible dark-mode borders (border token collided with secondary)
+- **UI**: Remove the 16px empty strip beside the collapsed sidebar
+- **UI**: Align top bars to a uniform `h-14` height and the account selector header to the search/reply toolbars
+- **UI**: Close pane gaps by centering the resize handle on the seam
+- **Settings**: Fix section gears permanently hijacking the active tab
+
+## 1.7.2 (2026-05-28)
+
+### Features
+
+- **Mail**: Scheduled send and send delay (#322)
+- **Mail**: Drag emails out to the file explorer as `.eml`
+- **Mail**: Import emails from `.zip` archives
+- **Mail**: "Move to Trash and mark as read" delete action (#323)
+- **Mail**: Include group inboxes in the unified mailbox view (#328)
+- **Mail**: Locale-aware date format in the email list with a preset picker (#331)
+- **Mail**: Allow drag-and-drop into shared mailboxes
+- **Composer**: Ctrl/Cmd+Enter sends the open draft
+- **Settings**: New Downloads tab with template editor for `.eml` and attachment filenames
+- **Settings**: Filename transform settings and an ASCII-only "date (from-to) subject" template
+- **Settings**: Post-export action (keep / archive / trash)
+- **Settings**: Template for multi-email `.zip` filenames
+- **Admin**: Per-domain branding editor with overrides on `/api/config`, manifest, and PWA icon (#332)
+- **Admin**: Policy-controlled push relay URL with optional user lock
+- **i18n**: `NEXT_PUBLIC_DEFAULT_LOCALE` for fallback UI locale (#243)
+
+### Fixes
+
+- **Mail**: Editable HTML signature in new mail; clean state on every compose entry (#329)
+- **Mail**: Report real upload progress with XHR progress events (#333)
+- **Mail**: Restore `blob:` in `object-src` and `frame-src` CSP for PDF/HTML previews
+- **Mail**: Match user-avatar treatment on quick reply
+- **Email viewer**: Stop shattering table cells with `word-break: break-word`
+- **Composer**: Scope Ctrl/Cmd+Enter send to the focused composer
+- **Composer**: Stop closing the form when editing any field
+- **Pro**: Keep the empty viewer pane visible in the split layout
+- **Pro**: Prevent an empty main pane when reordering tabs across panes
+- **Mobile**: Collapse focus mail layout to multi-line
+- **Mobile**: Keep a gutter on bare-HTML and plain-text emails
+- **Calendar**: Align continued multi-week events with the week's left edge
+- **Calendar**: Show the end date in the event popover for multi-day events (#318)
+- **Calendar**: Convert `recurrenceRules` to singular in batch create
+- **Calendar**: Handle malformed event dates (#316)
+- **Files**: Stop URL-encoding drag-out filenames and preserve Unicode letters
+- **Routing**: Prefix remaining `<img>`, favicon, and WebDAV URLs with `basePath` (#319)
+- **Routing**: Prefix hand-written URLs with `basePath` for subpath deployments
+- **Auth**: `OAUTH_ALLOW_PRIVATE_ENDPOINTS` for split-DNS setups
+
+### i18n
+
+- Add missing translation keys across 16 locales
+
 ## 1.7.1 (2026-05-22)
 
 ### Features

Dockerfile

@@ -8,6 +8,11 @@ ENV NEXT_TELEMETRY_DISABLED=1
 # at build time, so it cannot be changed without rebuilding.
 ARG NEXT_PUBLIC_BASE_PATH=
 ENV NEXT_PUBLIC_BASE_PATH=$NEXT_PUBLIC_BASE_PATH
+# Optional: fallback UI locale (e.g. tr, de, fr) used when the visitor's
+# Accept-Language header does not match any supported locale. Baked in at
+# build time because next-intl wires it into client-side routing too.
+ARG NEXT_PUBLIC_DEFAULT_LOCALE=
+ENV NEXT_PUBLIC_DEFAULT_LOCALE=$NEXT_PUBLIC_DEFAULT_LOCALE
 # Commit SHA shown in the About screen. .dockerignore excludes .git, so
 # `git rev-parse` inside the build can't find it - CI must pass it in.
 ARG GIT_COMMIT=unknown

FEATURES.md

@@ -7,7 +7,10 @@
 - Unified mailbox view across all connected accounts
 - Three selectable mail layouts: split (three-pane), focused list, and reading pane at bottom
 - Draft auto-save with identity preservation, persisted HTML body, and proper `In-Reply-To` / `References` headers on replies
-- Attachment upload, download, drag-out to local file system, and inline preview; image thumbnails and forgotten-attachment warning
+- Attachment upload, download, drag-out to local file system, and inline preview – images, inline PDF on desktop and mobile, composer attachments (click to open), and `.eml` (`message/rfc822`) attachments rendered like an email; image thumbnails and forgotten-attachment warning
+- Scheduled send and configurable send delay
+- Read receipts (MDN, RFC 8098)
+- Editable, layout-preserving quote island when replying
 - Full-text search with JMAP filter panel, search chips, wildcards, OR conditions, and cross-mailbox queries
 - Batch operations – multi-select, archive, delete, move, tag
 - Archive modes – direct, by year, or by month
@@ -36,7 +39,7 @@
 - Auto-generated birthday calendar from contacts
 - Virtual locations (video conference URLs) as first-class event fields
 - Task management with due dates, priority, and completion status
-- Shared calendars with CalDAV discovery and multi-account home resolution
+- Shared calendars with CalDAV discovery, multi-account home resolution, and per-viewer colors
 - Week numbers, event hover preview, notifications with sound picker
 - Real-time sync via JMAP push
 
@@ -52,7 +55,7 @@
 ## Filters & Templates
 
 - Server-side filters via JMAP Sieve Scripts (RFC 9661)
-- Visual rule builder with expanded view; conditions (From, To, Subject, Size, Body…) and actions (Move, Forward, Star, Discard…)
+- Visual rule builder with expanded view; conditions (From, To, Subject, Size, Body, Attachment…) with multi-value matching and actions (Move, Forward, Star, Discard…)
 - Preserves rules authored in other clients
 - Raw Sieve editor with syntax validation
 - Vacation responder with date range scheduling
@@ -60,7 +63,7 @@
 
 ## Files
 
-- JMAP FileNode browser (Stalwart native cloud storage)
+- JMAP FileNode browser (Stalwart native cloud storage) with a real folder hierarchy; legacy flat-named files are migrated into nested `FileNode` folders automatically on load
 - Streamed WebDAV PUT upload and folder upload with progress tracking
 - Dynamic upload limits based on server configuration
 - Grid and list views with sorting by name, size, or date
@@ -72,7 +75,7 @@
 - External content blocked by default, with a trusted senders list
 - HTML sanitization via DOMPurify
 - S/MIME – manage certificates, sign, encrypt, decrypt, and verify; legacy 3DES / PBE support; per-account key isolation
-- SPF / DKIM / DMARC status indicators
+- SPF / DKIM / DMARC status indicators – surfaces the most severe SPF result and hides the "via" badge on spoofed mail
 - OAuth2 / OIDC with PKCE (Keycloak, Authentik, or built-in), OAuth-only mode, OAuth app passwords, and non-interactive SSO for embedded deployments
 - TOTP two-factor authentication
 - Account security panel for password and 2FA management via the Stalwart admin API
@@ -85,6 +88,7 @@
 
 - Selectable mail layouts (split three-pane, focused list, reading pane at bottom) with resizable columns
 - Dark and light themes with intelligent email color transformation
+- Bundled color themes including Aurora Glass and Elastic; theme cards render as a mini mailbox mockup built from the theme's own colors, with light/dark variant chips
 - Responsive desktop, tablet, and mobile layouts
 - Full keyboard navigation
 - Drag-and-drop email organization and tag assignment
@@ -98,7 +102,7 @@
 
 ## Internationalization
 
-17 languages: Česky · Dansk · Deutsch · English · Español · Français · Italiano · Latviešu · Nederlands · Polski · Português · Türkçe · Русский · Українська · 한국어 · 日本語 · 简体中文
+18 languages: Česky · Dansk · Deutsch · English · Español · Français · Italiano · Latviešu · Magyar · Nederlands · Polski · Português · Türkçe · Русский · Українська · 한국어 · 日本語 · 简体中文
 
 Automatic browser detection with persistent preference. Configurable locale URL prefix via `NEXT_PUBLIC_LOCALE_PREFIX`.
 
@@ -118,7 +122,9 @@ Automatic browser detection with persistent preference. Configurable locale URL
 - Web setup wizard for first launch – guides through JMAP server(s), OAuth/OIDC, session secret, logging, branding (with file upload), and admin password; persists to the admin config dir, no `.env.local` editing required
 - Stalwart admin dashboard with dedicated policy sections, collapsed into a single tabbed page
 - Split admin storage: `ADMIN_CONFIG_DIR` (operator-authored, mountable read-only after setup) and `ADMIN_STATE_DIR` (runtime audit log and login timestamps)
-- Plugin system – schema-driven config UI, render and intercept hooks, `onAvatarResolve`, `onBeforeEmailSend`, composer-sidebar and email-banner slots, calendar event slots, i18n APIs, and managed policy enforcement
+- File-based secrets for JSON config: `passwordHashFile` (admin password), `sessionSecretFile`, and `oauthClientSecretFile` for Docker/Kubernetes secret mounts
+- Admin toggle for search-engine indexing (`robots.txt` / `noindex`)
+- Plugin system – schema-driven config UI, render and intercept hooks, `onAvatarResolve`, `onBeforeEmailSend`, composer-sidebar and email-banner slots, calendar event slots, i18n APIs (localizable sandboxed plugins via manifest locales and `api.i18n.t`), an `/api/translate` proxy, email-body access, and managed policy enforcement
 - Plugin hot-reload and dev-folder loading, on-demand `src/` bundling via esbuild, and `http:fetch` permission with `httpOrigins`
 - Themes – upload, enforce, and manage admin-controlled themes as ZIP bundles
 - Extension marketplace – browse and install plugins and themes from a configurable directory (`EXTENSION_DIRECTORY_URL`); install/uninstall restricted to the admin dashboard
@@ -126,7 +132,7 @@ Automatic browser detection with persistent preference. Configurable locale URL
 
 ## Operations
 
-- Progressive Web App with service worker, install prompt, web push notifications for inbox mail, and dynamic manifest
+- Progressive Web App with service worker, install prompt, web push notifications for inbox mail, dynamic manifest, and configurable (per-domain) install screenshots
 - Automatic update check with server-side logging of new releases and a non-dismissible update notice
 - Structured logging (`text` or `json`) with category-based levels
 - Anonymous instance telemetry (opt-out via admin UI or `BULWARK_TELEMETRY=off`) – version, platform, bucketed account counts, feature toggles only

README.md

@@ -12,7 +12,7 @@ A modern, self-hosted webmail client for [Stalwart Mail Server](https://stalw.ar
 
 [![License: AGPL v3](https://img.shields.io/badge/license-AGPL%20v3-blue.svg?logo=gnu&logoColor=white)](LICENSE)
 [![Discord](https://img.shields.io/discord/1482128142939455674?color=7289da&label=discord&logo=discord&logoColor=white)](https://discord.gg/tYCujymGrT)
-[![Version](https://img.shields.io/badge/version-1.7.1-green.svg?logo=git&logoColor=white)](CHANGELOG.md)
+[![Version](https://img.shields.io/badge/version-1.7.3-green.svg?logo=git&logoColor=white)](CHANGELOG.md)
 [![Docker](https://img.shields.io/badge/docker-ghcr.io%2Fbulwarkmail%2Fwebmail-blue?logo=docker&logoColor=white)](https://ghcr.io/bulwarkmail/webmail)
 [![Grafana](https://img.shields.io/badge/grafana-dashboard-orange?logo=grafana&logoColor=white)](https://grafana.external.bulwarkmail.org/)
 
@@ -86,7 +86,7 @@ Bulwark is a full webmail suite, not just an inbox. It bundles the four apps mos
 - **Contacts** – multiple address books, groups, vCard import/export
 - **Files** – Stalwart's JMAP FileNode storage with previews and folder upload
 
-Plus the infrastructure around them: a web setup wizard, OAuth2 / OIDC SSO, TOTP 2FA, multi-account with HTTP/2 connection pooling, 15 languages, PWA install, dark/light themes, a plugin system with an extension marketplace, and an admin dashboard.
+Plus the infrastructure around them: a web setup wizard, OAuth2 / OIDC SSO, TOTP 2FA, multi-account with HTTP/2 connection pooling, 18 languages, PWA install, dark/light themes, a plugin system with an extension marketplace, and an admin dashboard.
 
 Full feature list: **[FEATURES.md](FEATURES.md)**.
 
@@ -211,6 +211,12 @@ LOGIN_COMPANY_NAME=My Company
 LOGIN_WEBSITE_URL=https://example.com
 LOGIN_IMPRINT_URL=https://example.com/imprint
 LOGIN_PRIVACY_POLICY_URL=https://example.com/privacy
+
+# Per-domain overrides (optional). When the webmail is served on multiple
+# hostnames, each host can override any subset of the branding fields above.
+# Match is on the request Host (or X-Forwarded-Host). Use "*.example.com" to
+# match any subdomain. Unset fields fall back to the global values.
+DOMAIN_BRANDING=[{"host":"maildomain1.com","loginCompanyName":"Company One","loginLogoLightUrl":"/branding/one.svg"},{"host":"maildomain2.com","loginCompanyName":"Company Two"}]
 ```
 
 </details>

VERSION

@@ -1 +1 @@
-1.7.1
+1.7.3

app/(main)/[locale]/auth/callback/page.tsx

@@ -4,7 +4,7 @@ import { Suspense, useEffect, useState } from "react";
 import { useRouter, useSearchParams } from "next/navigation";
 import { useTranslations } from "next-intl";
 import { useAuthStore } from "@/stores/auth-store";
-import { getPathPrefix } from "@/lib/browser-navigation";
+import { apiFetch, getPathPrefix } from "@/lib/browser-navigation";
 import { Loader2, AlertCircle } from "lucide-react";
 import { Button } from "@/components/ui/button";
 import { useParams } from "next/navigation";
@@ -96,7 +96,7 @@ function OAuthCallbackInner() {
         // the refresh-token cookie write for the same reason.
         (async () => {
           try {
-            const res = await fetch("/api/auth/sso/complete", {
+            const res = await apiFetch("/api/auth/sso/complete", {
               method: "POST",
               headers: { "Content-Type": "application/json" },
               credentials: "include",

app/(main)/[locale]/calendar/page.tsx

@@ -60,6 +60,7 @@ import { useConfirmDialog } from "@/hooks/use-confirm-dialog";
 import { CreateCalendarModal } from "@/components/calendar/create-calendar-modal";
 import { getUserParticipantId } from "@/lib/calendar-participants";
 import { generateBirthdayEvents, createBirthdayCalendar, BIRTHDAY_CALENDAR_ID } from "@/lib/birthday-calendar";
+import { sharedCalendarColorKey, pickUnusedCalendarColor } from "@/lib/shared-calendar-colors";
 import { debug } from "@/lib/debug";
 import { consumePendingWebcal, hasPendingWebcal, subscribeToPendingWebcal } from "@/lib/protocol-handlers/session";
 import type { ParsedWebcal } from "@/lib/protocol-handlers/webcal";
@@ -97,6 +98,9 @@ export default function CalendarPage() {
     refreshAllSubscriptions, icalSubscriptions,
   } = useCalendarStore();
   const { firstDayOfWeek, timeFormat, showWeekNumbers, enableCalendarTasks, showTasksOnCalendar, calendarHoverPreview, showBirthdayCalendar, birthdayCalendarColor, updateSetting } = useSettingsStore();
+  const sharedCalendarColors = useSettingsStore((s) => s.sharedCalendarColors);
+  const setSharedCalendarColor = useSettingsStore((s) => s.setSharedCalendarColor);
+  const removeSharedCalendarColor = useSettingsStore((s) => s.removeSharedCalendarColor);
   const taskStore = useTaskStore();
   const fetchTasksFn = useTaskStore(state => state.fetchTasks);
   const { identities } = useIdentityStore();
@@ -1030,10 +1034,47 @@ export default function CalendarPage() {
     try { return t('birthday_calendar'); } catch { return 'Birthdays'; }
   })();
 
+  // Apply each shared calendar's local color override (per-viewer recolor,
+  // #345). The override replaces the calendar's color and wins over per-event
+  // colors via the `colorIsLocalOverride` flag (see getEventColor). Personal
+  // calendars are passed through untouched.
+  const displayCalendars = useMemo(() => {
+    return calendars.map((cal) => {
+      if (!cal.isShared) return cal;
+      const override = sharedCalendarColors[sharedCalendarColorKey(cal)];
+      if (!override) return cal;
+      return { ...cal, color: override, colorIsLocalOverride: true };
+    });
+  }, [calendars, sharedCalendarColors]);
+
+  // Auto-assign a random, not-yet-used palette color to any freshly shared
+  // calendar so multiple shared calendars don't collide on one color. Runs
+  // once per calendar (guarded by the presence of an existing key), and the
+  // user can still overwrite it from the sidebar.
+  useEffect(() => {
+    const shared = calendars.filter((c) => c.isShared);
+    const missing = shared.filter((c) => !sharedCalendarColors[sharedCalendarColorKey(c)]);
+    if (missing.length === 0) return;
+    // Seed "used" with personal calendar colors plus already-assigned shared
+    // overrides so the picks stay distinct from what's already on screen.
+    const used = new Set<string>();
+    for (const c of calendars) {
+      if (!c.isShared && c.color) used.add(c.color.toLowerCase());
+    }
+    for (const color of Object.values(sharedCalendarColors)) {
+      if (color) used.add(color.toLowerCase());
+    }
+    for (const cal of missing) {
+      const color = pickUnusedCalendarColor(used);
+      used.add(color.toLowerCase());
+      setSharedCalendarColor(sharedCalendarColorKey(cal), color);
+    }
+  }, [calendars, sharedCalendarColors, setSharedCalendarColor]);
+
   const allCalendars = useMemo(() => {
-    if (!showBirthdayCalendar) return calendars;
+    if (!showBirthdayCalendar) return displayCalendars;
-    return [...calendars, createBirthdayCalendar(birthdayCalendarName, birthdayCalendarColor)];
+    return [...displayCalendars, createBirthdayCalendar(birthdayCalendarName, birthdayCalendarColor)];
-  }, [calendars, showBirthdayCalendar, birthdayCalendarName, birthdayCalendarColor]);
+  }, [displayCalendars, showBirthdayCalendar, birthdayCalendarName, birthdayCalendarColor]);
 
   const visibleEvents = useMemo(() => {
     const filtered = events.filter((e) => {
@@ -1219,7 +1260,7 @@ export default function CalendarPage() {
               />
               <TaskListView
                 tasks={taskStore.tasks}
-                calendars={calendars}
+                calendars={displayCalendars}
                 selectedCalendarIds={selectedCalendarIds}
                 filter={taskStore.filter}
                 showCompleted={taskStore.showCompleted}
@@ -1317,8 +1358,21 @@ export default function CalendarPage() {
                   updateSetting('birthdayCalendarColor', color);
                   return;
                 }
+                // Shared calendars: recolor locally only (the viewer usually
+                // can't write the owner's calendar, and it'd recolor it for
+                // everyone). Personal calendars write through to the server.
+                const cal = allCalendars.find((c) => c.id === calendarId);
+                if (cal?.isShared) {
+                  setSharedCalendarColor(sharedCalendarColorKey(cal), color);
+                  return;
+                }
                 updateCalendar(client, calendarId, { color });
               } : undefined}
+              onResetColor={(cal) => {
+                // Drop the local override; the auto-assign effect picks a
+                // fresh unused color (so it never reverts to a collision).
+                removeSharedCalendarColor(sharedCalendarColorKey(cal));
+              }}
               onShareCalendar={client ? (cal) => setSharingCalendarId(cal.id) : undefined}
               onCreateEvent={(cal: Calendar) => {
                 setDefaultCalendarIdForCreate(cal.id);
@@ -1389,7 +1443,7 @@ export default function CalendarPage() {
           onSubscribe={() => setShowSubscriptionModal(true)}
           isMobile={isMobile}
           onNavigateBack={isMobile && mobileReturnToMonth && normalizedViewMode === "day" ? navigateBackToMonth : undefined}
-          calendars={calendars}
+          calendars={displayCalendars}
           selectedCalendarIds={selectedCalendarIds}
           onToggleVisibility={toggleCalendarVisibility}
           enableCalendarTasks={enableCalendarTasks}
@@ -1419,7 +1473,7 @@ export default function CalendarPage() {
               <EventModal
                 key={editEvent?.id ?? 'new'}
                 event={editEvent}
-                calendars={calendars}
+                calendars={displayCalendars}
                 defaultDate={defaultModalDate}
                 defaultEndDate={defaultModalEndDate}
                 defaultAllDay={defaultModalAllDay}
@@ -1442,7 +1496,7 @@ export default function CalendarPage() {
               <TaskModal
                 key={editTask?.id ?? 'new-task'}
                 task={editTask}
-                calendars={calendars}
+                calendars={displayCalendars}
                 onSave={handleSaveTask}
                 onDelete={handleDeleteTask}
                 onClose={() => { setShowTaskModal(false); setEditTask(null); }}
@@ -1529,7 +1583,7 @@ export default function CalendarPage() {
       {detailEvent && detailAnchorRect && (
         <EventDetailPopover
           event={detailEvent}
-          calendar={calendars.find(c => detailEvent.calendarIds[c.id])}
+          calendar={displayCalendars.find(c => detailEvent.calendarIds[c.id])}
           anchorRect={detailAnchorRect}
           onEdit={handleEditFromDetail}
           onDelete={handleDeleteFromDetail}
@@ -1549,7 +1603,7 @@ export default function CalendarPage() {
         <EventModal
           key={editEvent?.id ?? 'new'}
           event={editEvent}
-          calendars={calendars}
+          calendars={displayCalendars}
           defaultDate={defaultModalDate}
           defaultEndDate={defaultModalEndDate}
           defaultAllDay={defaultModalAllDay}
@@ -1566,7 +1620,7 @@ export default function CalendarPage() {
 
       {showImportModal && client && (
         <ICalImportModal
-          calendars={calendars}
+          calendars={displayCalendars}
           client={client}
           initialUrl={pendingSubscription?.url}
           onClose={() => {

app/(main)/[locale]/files/page.tsx

@@ -27,7 +27,7 @@ import { FilePreviewModal } from "@/components/files/file-preview-modal";
 import { loadFilesSettings } from "@/components/files/files-settings-dialog";
 import type { FolderLayout } from "@/components/files/files-settings-dialog";
 import { AppTopBannerSlot } from "@/components/plugins/app-top-banner-slot";
-import { AlertTriangle } from "lucide-react";
+import { AlertTriangle, Loader2 } from "lucide-react";
 
 export default function FilesPage() {
   const router = useRouter();
@@ -48,9 +48,11 @@ export default function FilesPage() {
     supportsFiles,
     selectedResources,
     uploadProgress,
+    migrationProgress,
     clipboard,
     initClient,
     checkSupport,
+    migrateLegacyFlatNodes,
     navigate,
     navigateByPath,
     refresh,
@@ -160,13 +162,16 @@ export default function FilesPage() {
   const storeClient = useFileStore(s => s.client);
   useEffect(() => {
     if (storeClient && supportsFiles === null) {
-      checkSupport().then((supported) => {
+      checkSupport().then(async (supported) => {
         if (supported) {
+          // Upgrade any files created by older builds (flat path-encoded names)
+          // into the real FileNode hierarchy before the first listing.
+          await migrateLegacyFlatNodes();
           navigate(null);
         }
       });
     }
-  }, [storeClient, supportsFiles, checkSupport, navigate]);
+  }, [storeClient, supportsFiles, checkSupport, migrateLegacyFlatNodes, navigate]);
 
   const handleNavigate = useCallback((path: string, resourceId?: string | null) => {
     // Pro shell only: the Account breadcrumb segment signals "go to this
@@ -573,6 +578,32 @@ export default function FilesPage() {
         />
       )}
 
+      {/* Legacy file migration progress (issue #379) */}
+      {migrationProgress && (
+        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/40 backdrop-blur-sm">
+          <div className="w-[22rem] max-w-[90vw] rounded-lg border border-border bg-background p-6 shadow-xl">
+            <div className="flex items-center gap-3">
+              <Loader2 className="w-5 h-5 text-primary animate-spin shrink-0" />
+              <div>
+                <p className="text-sm font-medium">{t("migration_title")}</p>
+                <p className="text-xs text-muted-foreground">{t("migration_description")}</p>
+              </div>
+            </div>
+            <div className="mt-4 h-1.5 bg-primary/20 rounded-full overflow-hidden">
+              <div
+                className="h-full bg-primary rounded-full transition-all duration-300"
+                style={{ width: migrationProgress.total > 0
+                  ? `${(migrationProgress.current / migrationProgress.total) * 100}%`
+                  : '0%' }}
+              />
+            </div>
+            <p className="mt-2 text-xs text-muted-foreground tabular-nums text-right">
+              {migrationProgress.current} / {migrationProgress.total}
+            </p>
+          </div>
+        </div>
+      )}
+
       <SidebarAppsModal isOpen={showAppsModal} onClose={closeAppsModal} />
       <ConfirmDialog {...confirmDialogProps} />
       </div>

app/(main)/[locale]/layout.tsx

@@ -9,6 +9,7 @@ import { ProtocolLaunchHandlerProvider } from "@/components/protocol/protocol-la
 import { ProInterfaceRedirect } from "@/components/pro/pro-interface-redirect";
 import { PluginDialogHost } from "@/components/plugins/plugin-dialog-host";
 import { PluginConsentDialog } from "@/components/plugins/plugin-consent-dialog";
+import { PWAInstallPrompt } from "@/components/pwa-install-prompt";
 import { locales } from "@/i18n/routing";
 
 export default async function LocaleLayout({
@@ -41,6 +42,7 @@ export default async function LocaleLayout({
                   {children}
                   <PluginDialogHost />
                   <PluginConsentDialog />
+                  <PWAInstallPrompt />
                 </ProtocolLaunchHandlerProvider>
               </TourProvider>
             </EmbeddedBridgeProvider>

app/(main)/[locale]/login/page.tsx

@@ -11,10 +11,10 @@ import { useAccountStore } from "@/stores/account-store";
 import { useThemeStore } from "@/stores/theme-store";
 import { useShallow } from "zustand/react/shallow";
 import { useConfig } from "@/hooks/use-config";
-import { apiFetch, getPathPrefix } from "@/lib/browser-navigation";
+import { apiFetch, getPathPrefix, withBasePath } from "@/lib/browser-navigation";
 import { cn } from "@/lib/utils";
 import { AlertCircle, Loader2, X, Info, Eye, EyeOff, LogIn, Sun, Moon, Monitor, Check, Shield, Play, Copy } from "lucide-react";
-import { discoverOAuth, type OAuthMetadata } from "@/lib/oauth/discovery";
+import { type OAuthMetadata } from "@/lib/oauth/discovery";
 import { generateCodeVerifier, generateCodeChallenge, generateState } from "@/lib/oauth/pkce";
 import { useUpdateStore, selectBanner } from "@/stores/update-store";
 import type { PublicJmapServerEntry } from "@/lib/admin/jmap-servers";
@@ -329,16 +329,27 @@ export default function LoginPage() {
     if (!oauthEnabled || !serverUrl) return;
     setOauthDiscoveryDone(false);
     setOauthMetadata(null);
-    discoverOAuth(effectiveOauthIssuerUrl || serverUrl)
+    const controller = new AbortController();
+    // Discover via our own origin rather than fetching the IdP's /.well-known/*
+    // documents directly from the browser. A direct cross-origin discovery
+    // fetch is subject to CORS, and providers like Authentik serve those
+    // documents without Access-Control-Allow-Origin, so the browser blocks the
+    // response and login breaks (issue #382). The proxy runs discovery server
+    // side where CORS does not apply.
+    const query = selectedServer?.id ? `?server_id=${encodeURIComponent(selectedServer.id)}` : "";
+    apiFetch(`/api/auth/oauth/metadata${query}`, { signal: controller.signal })
+      .then(async (res) => (res.ok ? ((await res.json()) as OAuthMetadata) : null))
       .then((metadata) => {
         setOauthMetadata(metadata);
         setOauthDiscoveryDone(true);
       })
-      .catch(() => {
+      .catch((err) => {
+        if (err?.name === "AbortError") return;
         setOauthMetadata(null);
         setOauthDiscoveryDone(true);
       });
-  }, [oauthEnabled, serverUrl, effectiveOauthIssuerUrl]);
+    return () => controller.abort();
+  }, [oauthEnabled, serverUrl, effectiveOauthIssuerUrl, selectedServer?.id]);
 
   // Auto-SSO: when enabled with OAUTH_ONLY, skip the login page entirely
   const ssoError = searchParams.get("sso_error");
@@ -722,7 +733,7 @@ export default function LoginPage() {
             <div className="px-8 pt-12 pb-4 text-center">
               <div className="inline-flex items-center justify-center w-20 h-20 mb-6">
                 <img
-                  src={resolvedTheme === 'dark' ? loginLogoDarkUrl : loginLogoLightUrl}
+                  src={withBasePath(resolvedTheme === 'dark' ? loginLogoDarkUrl : loginLogoLightUrl)}
                   alt={appName}
                   className="max-w-20 max-h-20 object-contain"
                 />
@@ -872,7 +883,7 @@ export default function LoginPage() {
           <div className="px-8 pt-10 pb-6 text-center">
             <div className="inline-flex items-center justify-center w-16 h-16 mb-5">
               <img
-                src={resolvedTheme === 'dark' ? loginLogoDarkUrl : loginLogoLightUrl}
+                src={withBasePath(resolvedTheme === 'dark' ? loginLogoDarkUrl : loginLogoLightUrl)}
                 alt={appName}
                 className="max-w-16 max-h-16 object-contain"
               />

app/(main)/[locale]/pro/page.tsx

@@ -16,6 +16,7 @@ import { PaneSizeContext } from "@/hooks/use-pane-size";
 import { ProTabBar, PRO_TAB_DRAG_MIME } from "@/components/pro/pro-tab-bar";
 import { useProTabStore, type ProTab, type ProTabKind, type ProPaneId } from "@/stores/pro-tab-store";
 import { cn } from "@/lib/utils";
+import { getPathPrefix } from "@/lib/browser-navigation";
 
 import MailPage from "@/app/(main)/[locale]/page";
 import CalendarPage from "@/app/(main)/[locale]/calendar/page";
@@ -172,7 +173,7 @@ export default function ProHome() {
     // enabled it. If either precondition stops holding, hand the user back
     // to the standard shell.
     if (isMobile || isTablet || !proInterface) {
-      window.location.replace("/");
+      window.location.replace(`${getPathPrefix()}/`);
     }
   }, [initialCheckDone, isMobile, isTablet, proInterface]);
 

app/(main)/[locale]/settings/page.tsx

@@ -33,6 +33,8 @@ import {
   Languages,
   Info,
   Bug,
+  SwatchBook,
+  Download,
   X,
   type LucideIcon,
 } from 'lucide-react';
@@ -59,6 +61,7 @@ import { FolderSettings } from '@/components/settings/folder-settings';
 import { KeywordSettings } from '@/components/settings/keyword-settings';
 import { AccountSecuritySettings } from '@/components/settings/account-security-settings';
 import { FilesSettingsComponent } from '@/components/settings/files-settings';
+import { DownloadsSettings } from '@/components/settings/downloads-settings';
 import { ContactsSettings } from '@/components/settings/contacts-settings';
 import { SmimeSettings } from '@/components/settings/smime-settings';
 import { SidebarAppsSettings } from '@/components/settings/sidebar-apps-settings';
@@ -90,6 +93,7 @@ type Tab =
   | 'layout'
   | 'reading'
   | 'composing'
+  | 'downloads'
   | 'identities'
   | 'vacation'
   | 'filters'
@@ -126,6 +130,7 @@ const tabIcons: Record<Tab, LucideIcon> = {
   layout: LayoutGrid,
   reading: BookOpen,
   composing: PenLine,
+  downloads: Download,
   identities: UserPen,
   vacation: PalmtreeIcon,
   filters: Filter,
@@ -141,7 +146,7 @@ const tabIcons: Record<Tab, LucideIcon> = {
   protocol_handlers: LinkIcon,
   sidebar_apps: PanelLeftClose,
   about_data: Info,
-  themes: Palette,
+  themes: SwatchBook,
   plugins: Puzzle,
   debug: Bug,
 };
@@ -202,6 +207,7 @@ const tabSearchPaths: Record<Tab, string[]> = {
     'settings.email_behavior.signature_position',
     'settings.email_behavior.sub_address_delimiter',
   ],
+  downloads: ['settings.downloads'],
   identities: ['settings.identities'],
   vacation: ['settings.vacation'],
   filters: ['settings.filters'],
@@ -236,6 +242,7 @@ const tabKeywords: Record<Tab, string> = {
   layout: 'toolbar sidebar account switcher unified mailbox icons rail',
   reading: 'mark read preview thread conversation archive delete attachment open',
   composing: 'editor signature plain text reply forward draft compose',
+  downloads: 'download filename template eml attachment save export',
   identities: 'from address signature email',
   vacation: 'auto reply away out of office holiday responder',
   filters: 'sieve rules block junk forward',
@@ -329,6 +336,14 @@ const LEGACY_TAB_MAP: Record<string, Tab> = {
 
 function readPersistedTab(): Tab {
   try {
+    // One-shot deep link from the sidebar section gears (Folders / Tags).
+    // Used only as the initial tab and intentionally NOT written to
+    // 'settings-active-tab', so a gear click never becomes the persisted
+    // default that the regular Settings button lands on. Cleared on mount.
+    const deepLink = sessionStorage.getItem('settings-deep-link-tab');
+    if (deepLink) {
+      return (deepLink in LEGACY_TAB_MAP ? LEGACY_TAB_MAP[deepLink] : deepLink) as Tab;
+    }
     const saved = localStorage.getItem('settings-active-tab');
     if (!saved) return 'appearance';
     if (saved in LEGACY_TAB_MAP) {
@@ -354,6 +369,11 @@ export default function SettingsPage() {
   const { stalwartFeaturesEnabled } = useConfig();
   const { isFeatureEnabled } = usePolicyStore();
   const [activeTab, setActiveTab] = useState<Tab>(readPersistedTab);
+  // Consume the one-shot deep-link key so a section gear only steers this one
+  // open, never the persisted default for future Settings-button clicks.
+  useEffect(() => {
+    try { sessionStorage.removeItem('settings-deep-link-tab'); } catch { /* ignore */ }
+  }, []);
   const [mobileShowContent, setMobileShowContent] = useState(false);
   const [searchQuery, setSearchQuery] = useState('');
   const [pendingHighlight, setPendingHighlight] = useState<{ tab: Tab; label: string; pluginId?: string } | null>(null);
@@ -576,10 +596,12 @@ export default function SettingsPage() {
     // Appearance
     { id: 'appearance', label: t('tabs.appearance'), icon: tabIcons.appearance, group: 'appearance' },
     { id: 'layout', label: t('tabs.layout'), icon: tabIcons.layout, group: 'appearance' },
+    ...(isFeatureEnabled('themesEnabled') ? [{ id: 'themes' as Tab, label: 'Themes', icon: tabIcons.themes, group: 'appearance' as TabGroup }] : []),
 
     // Mail
     { id: 'reading', label: t('tabs.reading'), icon: tabIcons.reading, group: 'mail' },
     { id: 'composing', label: t('tabs.composing'), icon: tabIcons.composing, group: 'mail' },
+    { id: 'downloads', label: t('tabs.downloads'), icon: tabIcons.downloads, group: 'mail' },
     { id: 'identities', label: t('tabs.identities'), icon: tabIcons.identities, group: 'mail' },
     ...(supportsVacation ? [{ id: 'vacation' as Tab, label: t('tabs.vacation'), icon: tabIcons.vacation, group: 'mail' as TabGroup }] : []),
     ...(supportsSieve ? [{ id: 'filters' as Tab, label: t('tabs.filters'), icon: tabIcons.filters, group: 'mail' as TabGroup }] : []),
@@ -600,7 +622,6 @@ export default function SettingsPage() {
 
     // Advanced
     { id: 'about_data', label: t('tabs.about_data'), icon: tabIcons.about_data, group: 'advanced' },
-    ...(isFeatureEnabled('themesEnabled') ? [{ id: 'themes' as Tab, label: 'Themes', icon: tabIcons.themes, group: 'advanced' as TabGroup }] : []),
     ...(isFeatureEnabled('pluginsEnabled') ? [{ id: 'plugins' as Tab, label: 'Plugins', icon: tabIcons.plugins, group: 'advanced' as TabGroup }] : []),
     ...(isFeatureEnabled('debugModeEnabled') ? [{ id: 'debug' as Tab, label: t('tabs.debug'), icon: tabIcons.debug, group: 'advanced' as TabGroup }] : []),
   ];
@@ -666,6 +687,7 @@ export default function SettingsPage() {
       {effectiveActiveTab === 'layout' && <LayoutSettings />}
       {effectiveActiveTab === 'reading' && <ReadingSettings />}
       {effectiveActiveTab === 'composing' && <ComposingSettings />}
+      {effectiveActiveTab === 'downloads' && <DownloadsSettings />}
       {effectiveActiveTab === 'identities' && <IdentitySettings />}
       {effectiveActiveTab === 'vacation' && <VacationSettings />}
       {effectiveActiveTab === 'filters' && <FilterSettings />}
@@ -925,7 +947,7 @@ export default function SettingsPage() {
                   return (
                     <div key={tab.id}>
                       <button
-                        onClick={() => setActiveTab(tab.id)}
+                        onClick={() => handleTabSelect(tab.id)}
                         className={cn(
                           'w-full text-left px-3 py-2 rounded-md text-sm transition-colors duration-150 flex items-center gap-2.5',
                           effectiveActiveTab === tab.id

app/(main)/admin/_tabs/_jmap-servers-section.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { useEffect, useState } from 'react';
+import { useEffect, useRef, useState } from 'react';
 import { Plus, Trash2, RotateCcw, ChevronDown, ChevronRight } from 'lucide-react';
 import type { JmapServerEntry } from '@/lib/admin/jmap-servers';
 
@@ -77,30 +77,17 @@ function emptyDraft(): RowDraft {
 
 export function JmapServersSection({ value, source, onChange, onRevert }: Props) {
   const [drafts, setDrafts] = useState<RowDraft[]>(() => value.map(entryToDraft));
+  const lastEmittedRef = useRef(value);
 
   useEffect(() => {
-    // Re-sync from props when the underlying config value changes (e.g. revert,
+    if (value === lastEmittedRef.current) return;
-    // initial load). Skip when drafts already represent the same array to avoid
+    setDrafts(value.map(entryToDraft))
-    // clobbering in-progress edits.
-    setDrafts((prev) => {
-      if (prev.length === value.length) {
-        const same = prev.every((d, i) => {
-          const e = value[i];
-          return d.id === e.id && d.url === e.url && d.label === e.label;
-        });
-        if (same) return prev;
-      }
-      return value.map(entryToDraft);
-    });
   }, [value]);
 
   function commit(next: RowDraft[]) {
     setDrafts(next);
-    const entries: JmapServerEntry[] = [];
+    const entries = next.map(draftToEntry).filter((e): e is JmapServerEntry => e !== null);
-    for (const d of next) {
+    lastEmittedRef.current = entries;
-      const e = draftToEntry(d);
-      if (e) entries.push(e);
-    }
     onChange(entries);
   }
 

app/(main)/admin/_tabs/auth.tsx

@@ -273,6 +273,7 @@ export function AuthTab() {
         <Text label="OAuth Client ID" configKey="oauthClientId" value={currentValue('oauthClientId') as string} source={config.oauthClientId?.source} onChange={handleChange} onRevert={handleRevert} />
         <Text label="OAuth Client Secret" configKey="oauthClientSecret" value={currentValue('oauthClientSecret') as string} source={config.oauthClientSecret?.source} onChange={handleChange} onRevert={handleRevert} type="password" placeholder={config.oauthClientSecret?.hasValue ? '••••••••  (saved - type to replace)' : undefined} />
         <Text label="OAuth Issuer URL" configKey="oauthIssuerUrl" value={currentValue('oauthIssuerUrl') as string} source={config.oauthIssuerUrl?.source} onChange={handleChange} onRevert={handleRevert} placeholder="https://auth.example.com" />
+        <Toggle label="Allow private OAuth endpoints" description="Permit discovery to resolve to RFC-1918 / loopback hosts. Enable only for split-DNS deployments where the mail server's public hostname resolves to an internal IP." configKey="oauthAllowPrivateEndpoints" value={currentValue('oauthAllowPrivateEndpoints') as boolean} source={config.oauthAllowPrivateEndpoints?.source} onChange={handleChange} onRevert={handleRevert} />
         <Text label="OAuth Scopes" description="Space-separated scopes that replace the defaults. Leave blank to use the built-in scope list." configKey="oauthScopes" value={currentValue('oauthScopes') as string} source={config.oauthScopes?.source} onChange={handleChange} onRevert={handleRevert} placeholder="openid email offline_access" />
         <Text label="OAuth Extra Scopes" description="Additional space-separated scopes appended to the defaults." configKey="oauthExtraScopes" value={currentValue('oauthExtraScopes') as string} source={config.oauthExtraScopes?.source} onChange={handleChange} onRevert={handleRevert} placeholder="urn:ietf:params:oauth:..." />
       </Section>

app/(main)/admin/_tabs/branding.tsx

@@ -1,8 +1,14 @@
 'use client';
 
-import { useEffect, useRef, useState } from 'react';
+import { useEffect, useMemo, useRef, useState } from 'react';
-import { Save, Loader2, RotateCcw, ImageIcon, Upload, Trash2 } from 'lucide-react';
+import { Save, Loader2, RotateCcw, ImageIcon, Upload, Trash2, Globe, Plus, X } from 'lucide-react';
-import { apiFetch } from '@/lib/browser-navigation';
+import { apiFetch, withBasePath } from '@/lib/browser-navigation';
+import {
+  BRANDING_OVERRIDE_KEYS,
+  parseDomainBranding,
+  type BrandingOverrideKey,
+  type DomainBrandingEntry,
+} from '@/lib/admin/domain-branding';
 
 interface ConfigEntry {
   value?: unknown;
@@ -16,42 +22,67 @@ const IMAGE_FIELDS = [
   { key: 'appLogoDarkUrl', label: 'App Logo (Dark Mode)', accept: '.svg,.png,.jpg,.webp' },
   { key: 'loginLogoLightUrl', label: 'Login Logo (Light Mode)', accept: '.svg,.png,.jpg,.webp' },
   { key: 'loginLogoDarkUrl', label: 'Login Logo (Dark Mode)', accept: '.svg,.png,.jpg,.webp' },
-];
+] as const;
 
 const TEXT_FIELDS = [
   { key: 'loginCompanyName', label: 'Company Name' },
   { key: 'loginImprintUrl', label: 'Imprint URL' },
   { key: 'loginPrivacyPolicyUrl', label: 'Privacy Policy URL' },
   { key: 'loginWebsiteUrl', label: 'Company Website URL' },
-];
+] as const;
 
 const PWA_IMAGE_FIELDS = [
   { key: 'pwaIconUrl', label: 'PWA Icon', accept: '.svg,.png,.jpg,.webp' },
-];
+  { key: 'pwaScreenshotMobileUrl', label: 'PWA Screenshot (Mobile)', accept: '.png,.jpg,.webp' },
+  { key: 'pwaScreenshotDesktopUrl', label: 'PWA Screenshot (Desktop)', accept: '.png,.jpg,.webp' },
+] as const;
 
 const PWA_TEXT_FIELDS = [
   { key: 'appShortName', label: 'Short Name', placeholder: 'Shown on home screen (max ~12 chars)' },
   { key: 'appDescription', label: 'Description', placeholder: 'App description for install prompts' },
-];
+] as const;
 
 const PWA_COLOR_FIELDS = [
   { key: 'pwaThemeColor', label: 'Theme Color', defaultValue: '#ffffff' },
   { key: 'pwaBackgroundColor', label: 'Background Color', defaultValue: '#ffffff' },
-];
+] as const;
+
+// Accepts exact hosts and one-level wildcards (e.g. *.example.com).
+const HOST_RE = /^(\*\.)?[a-z0-9]([a-z0-9-]*[a-z0-9])?(\.[a-z0-9]([a-z0-9-]*[a-z0-9])?)*$/;
+// Tighter rule for uploads: wildcards can only point to externally-hosted
+// URLs, since we'd have no concrete subdomain to serve a file from.
+const EXACT_HOST_RE = /^[a-z0-9]([a-z0-9-]*[a-z0-9])?(\.[a-z0-9]([a-z0-9-]*[a-z0-9])?)*$/;
 
 export function BrandingTab() {
   const [config, setConfig] = useState<Record<string, ConfigEntry>>({});
-  const [edits, setEdits] = useState<Record<string, unknown>>({});
+  const [edits, setEdits] = useState<Record<string, string>>({});
   const [loading, setLoading] = useState(true);
   const [saving, setSaving] = useState(false);
   const [uploading, setUploading] = useState<string | null>(null);
   const [message, setMessage] = useState<{ type: 'success' | 'error'; text: string } | null>(null);
+  const [selectedHost, setSelectedHost] = useState<string | null>(null);
+  const [addingHost, setAddingHost] = useState(false);
+  const [newHostInput, setNewHostInput] = useState('');
+  const [newHostError, setNewHostError] = useState<string | null>(null);
   const fileInputRefs = useRef<Record<string, HTMLInputElement | null>>({});
 
   useEffect(() => {
     fetchConfig();
   }, []);
 
+  const domainEntries = useMemo<DomainBrandingEntry[]>(
+    () => parseDomainBranding(config['domainBranding']?.value),
+    [config],
+  );
+
+  // Drop selection if the host disappeared from the config (e.g. concurrent edit).
+  useEffect(() => {
+    if (selectedHost && !domainEntries.some(e => e.host === selectedHost)) {
+      setSelectedHost(null);
+      setEdits({});
+    }
+  }, [domainEntries, selectedHost]);
+
   async function fetchConfig() {
     setLoading(true);
     const res = await apiFetch('/api/admin/config');
@@ -59,29 +90,81 @@ export function BrandingTab() {
     setLoading(false);
   }
 
+  function selectedEntry(): DomainBrandingEntry | null {
+    if (!selectedHost) return null;
+    return domainEntries.find(e => e.host === selectedHost) ?? null;
+  }
+
   function handleChange(key: string, value: string) {
     setEdits(prev => ({ ...prev, [key]: value }));
     setMessage(null);
   }
 
   function currentValue(key: string): string {
-    if (key in edits) return edits[key] as string;
+    if (key in edits) return edits[key];
+    if (selectedHost) {
+      const entry = selectedEntry();
+      return (entry?.[key as BrandingOverrideKey] as string | undefined) ?? '';
+    }
     return (config[key]?.value as string) ?? '';
   }
 
+  function isOverriddenInScope(key: string): boolean {
+    if (selectedHost) {
+      const entry = selectedEntry();
+      const v = entry?.[key as BrandingOverrideKey];
+      return typeof v === 'string' && v.length > 0;
+    }
+    return config[key]?.source === 'admin';
+  }
+
+  const isUploadedFile = (key: string): boolean => {
+    const val = currentValue(key);
+    return val.startsWith('/api/admin/branding/');
+  };
+
+  function buildUpdatedDomainBranding(merge: Record<string, string>): DomainBrandingEntry[] {
+    if (!selectedHost) return domainEntries;
+    const next = domainEntries.slice();
+    const idx = next.findIndex(e => e.host === selectedHost);
+    const base: DomainBrandingEntry =
+      idx === -1 ? { host: selectedHost } : { ...next[idx] };
+    const writable = base as unknown as Record<string, string | undefined>;
+    for (const [key, value] of Object.entries(merge)) {
+      if (!(BRANDING_OVERRIDE_KEYS as readonly string[]).includes(key)) continue;
+      if (typeof value === 'string' && value.length > 0) {
+        writable[key] = value;
+      } else {
+        delete writable[key];
+      }
+    }
+    if (idx === -1) next.push(base);
+    else next[idx] = base;
+    return next;
+  }
+
   async function handleSave() {
     if (Object.keys(edits).length === 0) return;
     setSaving(true);
     setMessage(null);
 
+    const payload = selectedHost
+      ? { domainBranding: buildUpdatedDomainBranding(edits) }
+      : edits;
+
     const res = await apiFetch('/api/admin/config', {
       method: 'PATCH',
       headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify(edits),
+      body: JSON.stringify(payload),
     });
 
     if (res.ok) {
-      setMessage({ type: 'success', text: 'Branding updated. Changes visible on next page load.' });
+      setMessage({
+        type: 'success',
+        text: selectedHost
+          ? `Branding for ${selectedHost} updated. Changes visible on next page load.`
+          : 'Branding updated. Changes visible on next page load.',
+      });
       setEdits({});
       await fetchConfig();
     } else {
@@ -92,12 +175,20 @@ export function BrandingTab() {
   }
 
   async function handleUpload(slot: string, file: File) {
+    if (selectedHost && !EXACT_HOST_RE.test(selectedHost)) {
+      setMessage({
+        type: 'error',
+        text: 'Wildcard hosts cannot upload files. Enter a URL instead.',
+      });
+      return;
+    }
     setUploading(slot);
     setMessage(null);
 
     const formData = new FormData();
     formData.append('file', file);
     formData.append('slot', slot);
+    if (selectedHost) formData.append('host', selectedHost);
 
     const res = await apiFetch('/api/admin/branding', {
       method: 'POST',
@@ -112,10 +203,9 @@ export function BrandingTab() {
         delete next[slot];
         return next;
       });
-      setConfig(prev => ({
+      // Refresh from server so domainBranding entries reflect the upload.
-        ...prev,
+      await fetchConfig();
-        [slot]: { value: data.url, source: 'admin' },
+      void data;
-      }));
     } else {
       const data = await res.json();
       setMessage({ type: 'error', text: data.error || 'Upload failed' });
@@ -126,10 +216,13 @@ export function BrandingTab() {
   async function handleDeleteUpload(slot: string) {
     setMessage(null);
 
+    const body: { slot: string; host?: string } = { slot };
+    if (selectedHost) body.host = selectedHost;
+
     const res = await apiFetch('/api/admin/branding', {
       method: 'DELETE',
       headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify({ slot }),
+      body: JSON.stringify(body),
     });
 
     if (res.ok) {
@@ -147,6 +240,25 @@ export function BrandingTab() {
   }
 
   async function handleRevert(key: string) {
+    if (selectedHost) {
+      // Domain scope: drop the field from the entry and PATCH the array.
+      const updated = buildUpdatedDomainBranding({ [key]: '' });
+      const res = await apiFetch('/api/admin/config', {
+        method: 'PATCH',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ domainBranding: updated }),
+      });
+      if (res.ok) {
+        setEdits(prev => {
+          const next = { ...prev };
+          delete next[key];
+          return next;
+        });
+        await fetchConfig();
+      }
+      return;
+    }
+    // Default scope: revert via DELETE /api/admin/config
     const res = await apiFetch('/api/admin/config', {
       method: 'DELETE',
       headers: { 'Content-Type': 'application/json' },
@@ -162,12 +274,71 @@ export function BrandingTab() {
     }
   }
 
-  const isUploadedFile = (key: string): boolean => {
+  async function handleAddDomain() {
-    const val = currentValue(key);
+    const host = newHostInput.trim().toLowerCase().replace(/\.+$/, '');
-    return val.startsWith('/api/admin/branding/');
+    if (!host) {
-  };
+      setNewHostError('Enter a hostname');
+      return;
+    }
+    if (!HOST_RE.test(host)) {
+      setNewHostError('Invalid hostname. Use foo.example.com or *.example.com');
+      return;
+    }
+    if (domainEntries.some(e => e.host === host)) {
+      setNewHostError('A branding entry for this host already exists');
+      return;
+    }
+    setNewHostError(null);
+
+    const next: DomainBrandingEntry[] = [...domainEntries, { host }];
+    const res = await apiFetch('/api/admin/config', {
+      method: 'PATCH',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ domainBranding: next }),
+    });
+    if (res.ok) {
+      setNewHostInput('');
+      setAddingHost(false);
+      setSelectedHost(host);
+      setEdits({});
+      await fetchConfig();
+    } else {
+      const data = await res.json();
+      setNewHostError(data.error || 'Failed to add domain');
+    }
+  }
+
+  async function handleDeleteDomain() {
+    if (!selectedHost) return;
+    if (!confirm(`Remove branding entry for ${selectedHost}? Uploaded files for this domain will be left behind on disk.`)) {
+      return;
+    }
+    const next = domainEntries.filter(e => e.host !== selectedHost);
+    const res = await apiFetch('/api/admin/config', {
+      method: 'PATCH',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ domainBranding: next }),
+    });
+    if (res.ok) {
+      setSelectedHost(null);
+      setEdits({});
+      await fetchConfig();
+      setMessage({ type: 'success', text: `Removed branding entry for ${selectedHost}.` });
+    } else {
+      const data = await res.json();
+      setMessage({ type: 'error', text: data.error || 'Failed to remove domain' });
+    }
+  }
+
+  function handleScopeChange(host: string | null) {
+    if (Object.keys(edits).length > 0 && !confirm('Discard unsaved changes?')) return;
+    setSelectedHost(host);
+    setEdits({});
+    setMessage(null);
+  }
 
   const hasEdits = Object.keys(edits).length > 0;
+  const wildcardScope = !!selectedHost && !EXACT_HOST_RE.test(selectedHost);
 
   if (loading) {
     return <div className="flex items-center justify-center py-12 text-muted-foreground text-sm">Loading...</div>;
@@ -192,6 +363,102 @@ export function BrandingTab() {
         )}
       </div>
 
+      {/* Scope picker */}
+      <div className="border border-border rounded-lg">
+        <div className="px-4 py-3 border-b border-border bg-muted/30 flex items-center gap-2">
+          <Globe className="w-4 h-4 text-muted-foreground" />
+          <h2 className="text-sm font-medium text-foreground">Scope</h2>
+        </div>
+        <div className="px-4 py-3 space-y-3">
+          <div className="flex flex-wrap gap-2">
+            <button
+              type="button"
+              onClick={() => handleScopeChange(null)}
+              className={`h-8 px-3 rounded-md text-sm font-medium transition-colors ${
+                selectedHost === null
+                  ? 'bg-primary text-primary-foreground'
+                  : 'bg-muted text-foreground hover:bg-muted/70'
+              }`}
+            >
+              Default
+            </button>
+            {domainEntries.map(entry => (
+              <button
+                key={entry.host}
+                type="button"
+                onClick={() => handleScopeChange(entry.host)}
+                className={`h-8 px-3 rounded-md text-sm font-medium transition-colors ${
+                  selectedHost === entry.host
+                    ? 'bg-primary text-primary-foreground'
+                    : 'bg-muted text-foreground hover:bg-muted/70'
+                }`}
+              >
+                {entry.host}
+              </button>
+            ))}
+            {!addingHost && (
+              <button
+                type="button"
+                onClick={() => { setAddingHost(true); setNewHostError(null); }}
+                className="inline-flex items-center gap-1 h-8 px-3 rounded-md border border-dashed border-input text-sm text-muted-foreground hover:bg-muted hover:text-foreground transition-colors"
+              >
+                <Plus className="w-3.5 h-3.5" />
+                Add domain
+              </button>
+            )}
+          </div>
+          {addingHost && (
+            <div className="flex flex-wrap items-center gap-2">
+              <input
+                type="text"
+                autoFocus
+                value={newHostInput}
+                onChange={(e) => { setNewHostInput(e.target.value); setNewHostError(null); }}
+                onKeyDown={(e) => { if (e.key === 'Enter') void handleAddDomain(); }}
+                placeholder="mail.example.com or *.example.com"
+                className="h-8 w-64 rounded-md border border-input bg-background px-2.5 text-sm text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
+              />
+              <button
+                type="button"
+                onClick={handleAddDomain}
+                className="h-8 px-3 rounded-md bg-primary text-primary-foreground text-sm font-medium hover:bg-primary/90 transition-colors"
+              >
+                Add
+              </button>
+              <button
+                type="button"
+                onClick={() => { setAddingHost(false); setNewHostInput(''); setNewHostError(null); }}
+                className="h-8 px-2.5 rounded-md text-sm text-muted-foreground hover:text-foreground transition-colors"
+              >
+                Cancel
+              </button>
+              {newHostError && <span className="text-xs text-destructive">{newHostError}</span>}
+            </div>
+          )}
+          {selectedHost ? (
+            <div className="flex items-center justify-between gap-3 text-xs">
+              <p className="text-muted-foreground">
+                Editing overrides for <span className="font-mono text-foreground">{selectedHost}</span>.
+                Unset fields fall back to the Default values.
+                {wildcardScope && ' Uploads are disabled for wildcard hosts; enter a URL instead.'}
+              </p>
+              <button
+                type="button"
+                onClick={handleDeleteDomain}
+                className="inline-flex items-center gap-1 text-destructive hover:underline whitespace-nowrap"
+              >
+                <X className="w-3.5 h-3.5" />
+                Remove domain
+              </button>
+            </div>
+          ) : (
+            <p className="text-xs text-muted-foreground">
+              Editing the Default branding. Add a domain to override branding when the webmail is served on a specific hostname.
+            </p>
+          )}
+        </div>
+      </div>
+
       {message && (
         <div className={`text-sm rounded-md px-3 py-2 ${message.type === 'success' ? 'bg-emerald-50 text-emerald-700 dark:bg-emerald-950/30 dark:text-emerald-300' : 'bg-destructive/10 text-destructive'}`}>
           {message.text}
@@ -209,9 +476,9 @@ export function BrandingTab() {
               <div className="flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between sm:gap-4">
                 <div className="flex items-center gap-2 min-w-0">
                   <label className="text-sm text-foreground">{field.label}</label>
-                  {config[field.key]?.source === 'admin' && (
+                  {isOverriddenInScope(field.key) && (
                     <span className="text-[10px] font-medium uppercase tracking-wider px-1.5 py-0.5 rounded bg-primary/10 text-primary">
-                      {isUploadedFile(field.key) ? 'uploaded' : 'admin'}
+                      {isUploadedFile(field.key) ? 'uploaded' : selectedHost ? 'domain' : 'admin'}
                     </span>
                   )}
                 </div>
@@ -220,7 +487,7 @@ export function BrandingTab() {
                     type="text"
                     value={currentValue(field.key)}
                     onChange={(e) => handleChange(field.key, e.target.value)}
-                    placeholder="Enter URL or upload a file"
+                    placeholder={selectedHost ? 'Enter URL (uploads only for default scope)' : 'Enter URL or upload a file'}
                     className="h-8 w-full sm:w-64 min-w-0 rounded-md border border-input bg-background px-2.5 text-sm text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
                   />
                   <input
@@ -236,9 +503,9 @@ export function BrandingTab() {
                   />
                   <button
                     onClick={() => fileInputRefs.current[field.key]?.click()}
-                    disabled={uploading === field.key}
+                    disabled={uploading === field.key || wildcardScope}
                     className="inline-flex items-center gap-1.5 h-8 px-2.5 rounded-md border border-input bg-background text-sm text-foreground hover:bg-muted disabled:opacity-50 transition-colors"
-                    title="Upload file"
+                    title={wildcardScope ? 'Uploads disabled for wildcard hosts' : 'Upload file'}
                   >
                     {uploading === field.key ? <Loader2 className="w-3.5 h-3.5 animate-spin" /> : <Upload className="w-3.5 h-3.5" />}
                   </button>
@@ -251,7 +518,7 @@ export function BrandingTab() {
                       <Trash2 className="w-3.5 h-3.5" />
                     </button>
                   )}
-                  {config[field.key]?.source === 'admin' && !isUploadedFile(field.key) && (
+                  {isOverriddenInScope(field.key) && !isUploadedFile(field.key) && (
                     <button onClick={() => handleRevert(field.key)} className="text-muted-foreground hover:text-foreground" title="Revert to default">
                       <RotateCcw className="w-3.5 h-3.5" />
                     </button>
@@ -263,7 +530,7 @@ export function BrandingTab() {
                   <ImageIcon className="w-3.5 h-3.5 text-muted-foreground" />
                   <div className="h-8 w-auto bg-muted rounded flex items-center justify-center px-2">
                     <img
-                      src={currentValue(field.key)}
+                      src={withBasePath(currentValue(field.key))}
                       alt={field.label}
                       className="max-h-6 max-w-[200px] object-contain"
                       onError={(e) => { (e.target as HTMLImageElement).style.display = 'none'; }}
@@ -287,9 +554,9 @@ export function BrandingTab() {
               <div className="flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between sm:gap-4">
                 <div className="flex items-center gap-2 min-w-0">
                   <label className="text-sm text-foreground">{field.label}</label>
-                  {config[field.key]?.source === 'admin' && (
+                  {isOverriddenInScope(field.key) && (
                     <span className="text-[10px] font-medium uppercase tracking-wider px-1.5 py-0.5 rounded bg-primary/10 text-primary">
-                      {isUploadedFile(field.key) ? 'uploaded' : 'admin'}
+                      {isUploadedFile(field.key) ? 'uploaded' : selectedHost ? 'domain' : 'admin'}
                     </span>
                   )}
                 </div>
@@ -298,7 +565,7 @@ export function BrandingTab() {
                     type="text"
                     value={currentValue(field.key)}
                     onChange={(e) => handleChange(field.key, e.target.value)}
-                    placeholder="Enter URL or upload a file"
+                    placeholder={selectedHost ? 'Enter URL (uploads only for default scope)' : 'Enter URL or upload a file'}
                     className="h-8 w-full sm:w-64 min-w-0 rounded-md border border-input bg-background px-2.5 text-sm text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
                   />
                   <input
@@ -314,9 +581,9 @@ export function BrandingTab() {
                   />
                   <button
                     onClick={() => fileInputRefs.current[field.key]?.click()}
-                    disabled={uploading === field.key}
+                    disabled={uploading === field.key || wildcardScope}
                     className="inline-flex items-center gap-1.5 h-8 px-2.5 rounded-md border border-input bg-background text-sm text-foreground hover:bg-muted disabled:opacity-50 transition-colors"
-                    title="Upload file"
+                    title={wildcardScope ? 'Uploads disabled for wildcard hosts' : 'Upload file'}
                   >
                     {uploading === field.key ? <Loader2 className="w-3.5 h-3.5 animate-spin" /> : <Upload className="w-3.5 h-3.5" />}
                   </button>
@@ -329,7 +596,7 @@ export function BrandingTab() {
                       <Trash2 className="w-3.5 h-3.5" />
                     </button>
                   )}
-                  {config[field.key]?.source === 'admin' && !isUploadedFile(field.key) && (
+                  {isOverriddenInScope(field.key) && !isUploadedFile(field.key) && (
                     <button onClick={() => handleRevert(field.key)} className="text-muted-foreground hover:text-foreground" title="Revert to default">
                       <RotateCcw className="w-3.5 h-3.5" />
                     </button>
@@ -341,7 +608,7 @@ export function BrandingTab() {
                   <ImageIcon className="w-3.5 h-3.5 text-muted-foreground" />
                   <div className="h-8 w-auto bg-muted rounded flex items-center justify-center px-2">
                     <img
-                      src={currentValue(field.key)}
+                      src={withBasePath(currentValue(field.key))}
                       alt={field.label}
                       className="max-h-6 max-w-[200px] object-contain"
                       onError={(e) => { (e.target as HTMLImageElement).style.display = 'none'; }}
@@ -355,8 +622,10 @@ export function BrandingTab() {
             <div key={field.key} className="px-4 py-3 flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between sm:gap-4">
               <div className="flex items-center gap-2 min-w-0">
                 <label className="text-sm text-foreground">{field.label}</label>
-                {config[field.key]?.source === 'admin' && (
+                {isOverriddenInScope(field.key) && (
-                  <span className="text-[10px] font-medium uppercase tracking-wider px-1.5 py-0.5 rounded bg-primary/10 text-primary">admin</span>
+                  <span className="text-[10px] font-medium uppercase tracking-wider px-1.5 py-0.5 rounded bg-primary/10 text-primary">
+                    {selectedHost ? 'domain' : 'admin'}
+                  </span>
                 )}
               </div>
               <div className="flex items-center gap-2 w-full sm:w-auto">
@@ -367,7 +636,7 @@ export function BrandingTab() {
                   placeholder={field.placeholder}
                   className="h-8 w-full sm:w-72 min-w-0 rounded-md border border-input bg-background px-2.5 text-sm text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
                 />
-                {config[field.key]?.source === 'admin' && (
+                {isOverriddenInScope(field.key) && (
                   <button onClick={() => handleRevert(field.key)} className="text-muted-foreground hover:text-foreground" title="Revert to default">
                     <RotateCcw className="w-3.5 h-3.5" />
                   </button>
@@ -381,8 +650,10 @@ export function BrandingTab() {
               <div key={field.key} className="px-4 py-3 flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between sm:gap-4">
                 <div className="flex items-center gap-2 min-w-0">
                   <label className="text-sm text-foreground">{field.label}</label>
-                  {config[field.key]?.source === 'admin' && (
+                  {isOverriddenInScope(field.key) && (
-                    <span className="text-[10px] font-medium uppercase tracking-wider px-1.5 py-0.5 rounded bg-primary/10 text-primary">admin</span>
+                    <span className="text-[10px] font-medium uppercase tracking-wider px-1.5 py-0.5 rounded bg-primary/10 text-primary">
+                      {selectedHost ? 'domain' : 'admin'}
+                    </span>
                   )}
                 </div>
                 <div className="flex items-center gap-2 w-full sm:w-auto">
@@ -400,7 +671,7 @@ export function BrandingTab() {
                     placeholder={field.defaultValue}
                     className="h-8 w-full sm:w-32 min-w-0 rounded-md border border-input bg-background px-2.5 text-sm font-mono text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
                   />
-                  {config[field.key]?.source === 'admin' && (
+                  {isOverriddenInScope(field.key) && (
                     <button onClick={() => handleRevert(field.key)} className="text-muted-foreground hover:text-foreground" title="Revert to default">
                       <RotateCcw className="w-3.5 h-3.5" />
                     </button>
@@ -421,8 +692,10 @@ export function BrandingTab() {
             <div key={field.key} className="px-4 py-3 flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between sm:gap-4">
               <div className="flex items-center gap-2 min-w-0">
                 <label className="text-sm text-foreground">{field.label}</label>
-                {config[field.key]?.source === 'admin' && (
+                {isOverriddenInScope(field.key) && (
-                  <span className="text-[10px] font-medium uppercase tracking-wider px-1.5 py-0.5 rounded bg-primary/10 text-primary">admin</span>
+                  <span className="text-[10px] font-medium uppercase tracking-wider px-1.5 py-0.5 rounded bg-primary/10 text-primary">
+                    {selectedHost ? 'domain' : 'admin'}
+                  </span>
                 )}
               </div>
               <div className="flex items-center gap-2 w-full sm:w-auto">
@@ -433,7 +706,7 @@ export function BrandingTab() {
                   placeholder={field.key.includes('Url') ? 'https://...' : 'Enter value'}
                   className="h-8 w-full sm:w-72 min-w-0 rounded-md border border-input bg-background px-2.5 text-sm text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
                 />
-                {config[field.key]?.source === 'admin' && (
+                {isOverriddenInScope(field.key) && (
                   <button onClick={() => handleRevert(field.key)} className="text-muted-foreground hover:text-foreground" title="Revert to default">
                     <RotateCcw className="w-3.5 h-3.5" />
                   </button>

app/(main)/admin/_tabs/policy.tsx

@@ -28,7 +28,7 @@ const RESTRICTABLE_SETTINGS = [
   { key: 'density', label: 'Density', category: 'Appearance', type: 'enum', allowedValues: ['compact', 'regular', 'spacious'] },
   { key: 'animationsEnabled', label: 'Animations', category: 'Appearance', type: 'boolean' },
   { key: 'markAsReadDelay', label: 'Mark as Read Delay', category: 'Email', type: 'number' },
-  { key: 'deleteAction', label: 'Delete Action', category: 'Email', type: 'enum', allowedValues: ['trash', 'permanent'] },
+  { key: 'deleteAction', label: 'Delete Action', category: 'Email', type: 'enum', allowedValues: ['trash', 'trash-and-read', 'permanent'] },
   { key: 'showPreview', label: 'Show Preview', category: 'Email', type: 'boolean' },
   { key: 'mailLayout', label: 'Mail Layout', category: 'Email', type: 'enum', allowedValues: ['split', 'focus', 'horizontal'] },
   { key: 'emailsPerPage', label: 'Emails Per Page', category: 'Email', type: 'number' },
@@ -74,6 +74,18 @@ export function PolicyTab() {
     setMessage(null);
   }
 
+  function setPushRelayUrl(value: string) {
+    setPolicy(prev => ({ ...prev, pushRelayUrl: value }));
+    setDirty(true);
+    setMessage(null);
+  }
+
+  function togglePushRelayLocked() {
+    setPolicy(prev => ({ ...prev, pushRelayUrlLocked: !prev.pushRelayUrlLocked }));
+    setDirty(true);
+    setMessage(null);
+  }
+
   function toggleLocked(settingKey: string) {
     setPolicy(prev => {
       const existing = prev.restrictions[settingKey] || {};
@@ -183,6 +195,34 @@ export function PolicyTab() {
         </div>
       </div>
 
+      <div className="border border-border rounded-lg">
+        <div className="px-4 py-3 border-b border-border bg-muted/30">
+          <h2 className="text-sm font-medium text-foreground">Push Relay</h2>
+          <p className="text-xs text-muted-foreground mt-0.5">Override the Web Push relay URL shown in user notification settings. Leave empty to use the built-in default.</p>
+        </div>
+        <div className="px-4 py-3 space-y-3">
+          <input
+            type="url"
+            inputMode="url"
+            autoComplete="off"
+            spellCheck={false}
+            value={policy.pushRelayUrl ?? ''}
+            onChange={(e) => setPushRelayUrl(e.target.value)}
+            placeholder="https://notifications.relay.example.com"
+            className="w-full rounded border border-input bg-background px-3 py-2 text-sm"
+          />
+          <label className="flex items-center gap-1.5 text-xs text-muted-foreground cursor-pointer">
+            <input
+              type="checkbox"
+              checked={!!policy.pushRelayUrlLocked}
+              onChange={togglePushRelayLocked}
+              className="rounded border-input"
+            />
+            <Lock className="w-3 h-3" /> Lock - users cannot change this URL
+          </label>
+        </div>
+      </div>
+
       {categories.map(category => (
         <div key={category} className="border border-border rounded-lg">
           <div className="px-4 py-3 border-b border-border bg-muted/30">

app/(main)/admin/_tabs/settings.tsx

@@ -125,6 +125,7 @@ export function SettingsTab() {
         )}
         <ToggleSetting label="Stalwart Features" description="Enable Stalwart Mail Server-specific features" configKey="stalwartFeaturesEnabled" value={currentValue('stalwartFeaturesEnabled') as boolean} source={config.stalwartFeaturesEnabled?.source} onChange={handleChange} onRevert={handleRevert} />
         <ToggleSetting label="Demo Mode" description="Enable demo mode with sample data" configKey="demoMode" value={currentValue('demoMode') as boolean} source={config.demoMode?.source} onChange={handleChange} onRevert={handleRevert} />
+        <ToggleSetting label="Search Engine Indexing" description="Allow search engines to index this webmail. Off (the default) sends noindex/nofollow in the page head, recommended for private deployments." configKey="searchEngineIndexing" value={currentValue('searchEngineIndexing') as boolean} source={config.searchEngineIndexing?.source} onChange={handleChange} onRevert={handleRevert} />
       </SettingsSection>
 
       <SettingsSection title="JMAP Servers (multi-server)">

app/(main)/admin/layout.tsx

@@ -32,7 +32,7 @@ import { useThemeStore } from '@/stores/theme-store';
 import { getActiveAccountSlotHeaders } from '@/lib/auth/active-account-slot';
 
 import { useUpdateStore, selectHasUpdate } from '@/stores/update-store';
-import { apiFetch, getPathPrefix } from '@/lib/browser-navigation';
+import { apiFetch, getPathPrefix, withBasePath } from '@/lib/browser-navigation';
 
 // Single-page tab navigation: clicks update a Zustand store. The URL stays
 // at /admin so React doesn't fire a route transition on every tab switch -
@@ -90,9 +90,9 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
   const { appLogoLightUrl, appLogoDarkUrl, loginLogoLightUrl, loginLogoDarkUrl } = useConfig();
   const filesEnabled = usePolicyStore((s) => s.isFeatureEnabled('filesEnabled'));
   const resolvedTheme = useThemeStore((s) => s.resolvedTheme);
-  const logoUrl = resolvedTheme === 'dark'
+  const logoUrl = withBasePath(resolvedTheme === 'dark'
     ? (appLogoDarkUrl || appLogoLightUrl || loginLogoDarkUrl)
-    : (appLogoLightUrl || appLogoDarkUrl || loginLogoLightUrl);
+    : (appLogoLightUrl || appLogoDarkUrl || loginLogoLightUrl));
 
   // Match the navigation rail: red for security/deprecated, amber for normal.
   const hasUpdate = useUpdateStore(selectHasUpdate);

app/(main)/admin/login/page.tsx

@@ -5,7 +5,7 @@ import { useRouter } from 'next/navigation';
 import { Shield } from 'lucide-react';
 import { useConfig } from '@/hooks/use-config';
 import { useThemeStore } from '@/stores/theme-store';
-import { apiFetch } from '@/lib/browser-navigation';
+import { apiFetch, withBasePath } from '@/lib/browser-navigation';
 
 export default function AdminLoginPage() {
   const router = useRouter();
@@ -14,7 +14,7 @@ export default function AdminLoginPage() {
   const [loading, setLoading] = useState(false);
   const { loginLogoLightUrl, loginLogoDarkUrl } = useConfig();
   const resolvedTheme = useThemeStore((s) => s.resolvedTheme);
-  const logoUrl = resolvedTheme === 'dark' ? loginLogoDarkUrl : loginLogoLightUrl;
+  const logoUrl = withBasePath(resolvedTheme === 'dark' ? loginLogoDarkUrl : loginLogoLightUrl);
 
   async function handleSubmit(e: FormEvent) {
     e.preventDefault();

app/(main)/layout.tsx

@@ -1,12 +1,25 @@
 import type { Metadata, Viewport } from "next";
 import { Geist, Geist_Mono } from "next/font/google";
 import { headers } from "next/headers";
-import { getLocale } from "next-intl/server";
+import { getLocale, getTranslations } from "next-intl/server";
-import { PWAInstallPrompt } from "@/components/pwa-install-prompt";
 import { ServiceWorkerRegistration } from "@/components/service-worker-registration";
 import { configManager } from "@/lib/admin/config-manager";
+import { withBasePath } from "@/lib/browser-navigation";
+import { locales } from "@/i18n/routing";
 import "../globals.css";
 
+// This layout renders <html> and sits ABOVE the [locale] segment, so
+// next-intl's getLocale() returns the default locale here - emitting
+// <html lang="en"> on e.g. /de pages, which makes browsers offer to
+// "translate this page". Recover the active locale from the request pathname
+// (exposed by proxy.ts as x-pathname), falling back to getLocale() (cookie /
+// Accept-Language) when the path carries no locale segment.
+async function resolveRequestLocale(): Promise<string> {
+  const pathname = (await headers()).get("x-pathname") || "";
+  const seg = pathname.split("/").find((s) => (locales as readonly string[]).includes(s));
+  return seg ?? (await getLocale());
+}
+
 const geistSans = Geist({
   variable: "--font-geist-sans",
   subsets: ["latin"],
@@ -26,10 +39,21 @@ export const viewport: Viewport = {
 export async function generateMetadata(): Promise<Metadata> {
   await configManager.ensureLoaded();
   const faviconUrl = configManager.get<string>("faviconUrl", "/branding/Bulwark_Favicon.svg");
+  // Localize the <head> description to match the UI language; a hardcoded
+  // English description is another signal that makes Chrome offer to
+  // "translate this page". Resolve the locale from the request path, since this
+  // layout is above the [locale] segment (see resolveRequestLocale).
+  const locale = await resolveRequestLocale();
+  const t = await getTranslations({ locale });
 
   return {
     title: process.env.APP_NAME || process.env.NEXT_PUBLIC_APP_NAME || "Webmail",
-    description: "Minimalist webmail client using JMAP protocol",
+    description: t("meta_description"),
+    // A private webmail should not be indexed by search engines. This is opt-in
+    // via Settings -> General; the default (false) emits noindex/nofollow.
+    robots: configManager.get<boolean>("searchEngineIndexing", false)
+      ? { index: true, follow: true }
+      : { index: false, follow: false },
     appleWebApp: {
       capable: true,
       statusBarStyle: "black-translucent",
@@ -38,7 +62,7 @@ export async function generateMetadata(): Promise<Metadata> {
     formatDetection: {
       telephone: false,
     },
-    icons: { icon: faviconUrl },
+    icons: { icon: withBasePath(faviconUrl) },
   };
 }
 
@@ -47,7 +71,7 @@ export default async function RootLayout({
 }: {
   children: React.ReactNode;
 }) {
-  const locale = await getLocale();
+  const locale = await resolveRequestLocale();
   const nonce = (await headers()).get("x-nonce") ?? "";
   const parentOrigin = process.env.NEXT_PUBLIC_PARENT_ORIGIN || "";
 
@@ -91,7 +115,6 @@ export default async function RootLayout({
       >
         <ServiceWorkerRegistration />
         {children}
-        <PWAInstallPrompt />
       </body>
     </html>
   );

app/(main)/setup/page.tsx

@@ -3,7 +3,7 @@
 import { useEffect, useState, type FormEvent, type ReactNode } from 'react';
 import { useRouter, useSearchParams } from 'next/navigation';
 import { CheckCircle2, AlertTriangle, AlertCircle, Server, ShieldCheck, KeyRound, FileText, Palette, Lock, ShieldAlert } from 'lucide-react';
-import { apiFetch } from '@/lib/browser-navigation';
+import { apiFetch, getPathPrefix, withBasePath } from '@/lib/browser-navigation';
 
 type State = 'bootstrap' | 'configured' | 'env-managed';
 
@@ -258,7 +258,7 @@ export default function SetupWizardPage() {
                 // edge cases that swallow client-side replaces after the
                 // setupComplete flag flips.
                 setTimeout(() => {
-                  window.location.assign('/admin/login');
+                  window.location.assign(`${getPathPrefix()}/admin/login`);
                 }, 1500);
               }}
             />
@@ -340,13 +340,13 @@ function CompletedScreen() {
       </div>
       <div className="mt-6 space-y-2">
         <a
-          href="/admin/login"
+          href={`${getPathPrefix()}/admin/login`}
           className="block w-full rounded-md bg-primary text-primary-foreground text-center px-4 py-2.5 text-sm font-medium hover:bg-primary/90"
         >
           Sign in to admin dashboard
         </a>
         <a
-          href="/"
+          href={`${getPathPrefix()}/`}
           className="block w-full rounded-md border border-border text-center px-4 py-2.5 text-sm font-medium hover:bg-muted"
         >
           Open webmail login
@@ -422,13 +422,13 @@ function AlreadyConfiguredScreen() {
       </div>
       <div className="mt-6 space-y-2">
         <a
-          href="/admin/login"
+          href={`${getPathPrefix()}/admin/login`}
           className="block w-full rounded-md bg-primary text-primary-foreground text-center px-4 py-2.5 text-sm font-medium hover:bg-primary/90"
         >
           Sign in to admin dashboard
         </a>
         <a
-          href="/"
+          href={`${getPathPrefix()}/`}
           className="block w-full rounded-md border border-border text-center px-4 py-2.5 text-sm font-medium hover:bg-muted"
         >
           Open webmail login
@@ -1329,7 +1329,7 @@ function BrandingAsset({
             }}
           />
           {value ? (
-            <img src={value} alt="" className="max-w-full max-h-full object-contain" />
+            <img src={withBasePath(value)} alt="" className="max-w-full max-h-full object-contain" />
           ) : (
             <span className="text-[10px] text-muted-foreground text-center px-1">click or drop</span>
           )}

app/(sandbox)/layout.tsx

@@ -1,17 +1,14 @@
 import type { Metadata } from 'next';
 import type { ReactNode } from 'react';
-import { Geist, Geist_Mono } from 'next/font/google';
-import '../globals.css';
 
-const geistSans = Geist({
+// The plugin sandbox iframe runs with an opaque origin (the `sandbox`
-  variable: '--font-geist-sans',
+// attribute in production excludes `allow-same-origin` for isolation). Any
-  subsets: ['latin'],
+// asset request from this layout - bundled fonts, globals.css, etc. - is then
-});
+// cross-origin from the "null" origin to the host origin and gets blocked
-
+// (fonts in particular require CORS). So this layout is intentionally minimal:
-const geistMono = Geist_Mono({
+// no font imports, no CSS imports. Plugins ship their own styles, and both the
-  variable: '--font-geist-mono',
+// plugin bundle and all host API calls travel over the postMessage RPC bridge,
-  subsets: ['latin'],
+// so the sandbox never fetches same-origin assets itself.
-});
 
 export const metadata: Metadata = {
   title: 'Plugin sandbox',
@@ -21,10 +18,7 @@ export const metadata: Metadata = {
 export default function PluginSandboxLayout({ children }: { children: ReactNode }) {
   return (
     <html lang="en">
-      <body
+      <body style={{ margin: 0, padding: 0, background: 'transparent' }}>
-        className={`${geistSans.variable} ${geistMono.variable} antialiased`}
-        style={{ margin: 0, padding: 0, background: 'transparent' }}
-      >
         {children}
       </body>
     </html>

app/api/admin/branding/route.ts

@@ -3,8 +3,13 @@ import { requireAdminAuth, getClientIP } from '@/lib/admin/session';
 import { auditLog } from '@/lib/admin/audit';
 import { configManager } from '@/lib/admin/config-manager';
 import { getConfigDir } from '@/lib/admin/paths';
+import {
+  parseDomainBranding,
+  type DomainBrandingEntry,
+  type BrandingOverrideKey,
+} from '@/lib/admin/domain-branding';
 import { logger } from '@/lib/logger';
-import { writeFile, unlink, mkdir } from 'node:fs/promises';
+import { writeFile, unlink, mkdir, readdir } from 'node:fs/promises';
 import { existsSync } from 'node:fs';
 import path from 'node:path';
 
@@ -21,27 +26,99 @@ const ALLOWED_MIME_TYPES = new Set([
   'image/vnd.microsoft.icon',
 ]);
 
+type UploadSlot = BrandingOverrideKey;
+
 /** Slots that correspond to branding config keys */
-const VALID_SLOTS = new Set([
+const VALID_SLOTS = new Set<UploadSlot>([
   'faviconUrl',
   'pwaIconUrl',
   'appLogoLightUrl',
   'appLogoDarkUrl',
   'loginLogoLightUrl',
   'loginLogoDarkUrl',
+  'pwaScreenshotMobileUrl',
+  'pwaScreenshotDesktopUrl',
 ]);
 
+const EXT_BY_MIME: Record<string, string> = {
+  'image/svg+xml': '.svg',
+  'image/png': '.png',
+  'image/jpeg': '.jpg',
+  'image/webp': '.webp',
+  'image/x-icon': '.ico',
+  'image/vnd.microsoft.icon': '.ico',
+};
+
+const POSSIBLE_EXTS = ['.svg', '.png', '.jpg', '.jpeg', '.webp', '.ico'];
+
+// Exact hostnames only (no wildcards): wildcards can't be uploaded against
+// because we'd need a real subdomain to serve the file from.
+const EXACT_HOST_RE = /^[a-z0-9]([a-z0-9-]*[a-z0-9])?(\.[a-z0-9]([a-z0-9-]*[a-z0-9])?)*$/;
+
 function sanitizeFilename(name: string): string {
   // Strip directory traversal, keep only safe chars
   return path.basename(name).replace(/[^a-zA-Z0-9._-]/g, '_');
 }
 
+function normalizeHost(raw: string): string {
+  return raw.trim().toLowerCase().replace(/\.+$/, '');
+}
+
+/** Filename used to store a per-host uploaded asset. */
+function domainAssetName(host: string, slot: BrandingOverrideKey, ext: string): string {
+  return sanitizeFilename(`domain__${host}__${slot}${ext}`);
+}
+
+/** True if the file belongs to the given host+slot (any extension). */
+function isDomainAssetFor(filename: string, host: string, slot: BrandingOverrideKey): boolean {
+  const prefix = sanitizeFilename(`domain__${host}__${slot}.`);
+  return filename.startsWith(prefix);
+}
+
+/** Merge a per-host update into the existing domainBranding array. */
+function mergeDomainEntry(
+  current: DomainBrandingEntry[],
+  host: string,
+  patch: Partial<DomainBrandingEntry>,
+): DomainBrandingEntry[] {
+  const next = current.slice();
+  const idx = next.findIndex(e => e.host === host);
+  if (idx === -1) {
+    next.push({ host, ...patch });
+  } else {
+    next[idx] = { ...next[idx], ...patch };
+  }
+  return next;
+}
+
+/** Remove keys from a host's entry. If the entry has nothing left besides
+ *  `host`, drop it entirely. */
+function clearDomainKeys(
+  current: DomainBrandingEntry[],
+  host: string,
+  keys: BrandingOverrideKey[],
+): DomainBrandingEntry[] {
+  const idx = current.findIndex(e => e.host === host);
+  if (idx === -1) return current;
+  const entry = { ...current[idx] };
+  for (const key of keys) delete (entry as Record<string, unknown>)[key];
+  const next = current.slice();
+  if (Object.keys(entry).filter(k => k !== 'host').length === 0) {
+    next.splice(idx, 1);
+  } else {
+    next[idx] = entry;
+  }
+  return next;
+}
+
 /**
  * POST /api/admin/branding - Upload a branding image file
  *
  * Expects multipart/form-data with:
  *   - file: the image file
  *   - slot: which branding field this is for (e.g. "faviconUrl")
+ *   - host (optional): when set, the upload is stored against the
+ *     per-domain entry for that hostname instead of the global default.
  */
 export async function POST(request: NextRequest) {
   try {
@@ -52,15 +129,24 @@ export async function POST(request: NextRequest) {
     const formData = await request.formData();
     const file = formData.get('file') as File | null;
     const slot = formData.get('slot') as string | null;
+    const rawHost = (formData.get('host') as string | null) ?? '';
 
     if (!file || !slot) {
       return NextResponse.json({ error: 'Missing file or slot' }, { status: 400 });
     }
 
-    if (!VALID_SLOTS.has(slot)) {
+    if (!VALID_SLOTS.has(slot as UploadSlot)) {
       return NextResponse.json({ error: `Invalid slot: ${slot}` }, { status: 400 });
     }
 
+    const host = rawHost ? normalizeHost(rawHost) : '';
+    if (host && !EXACT_HOST_RE.test(host)) {
+      return NextResponse.json(
+        { error: `Invalid host: ${rawHost} (wildcards must be configured by URL, not upload)` },
+        { status: 400 },
+      );
+    }
+
     if (file.size > MAX_FILE_SIZE) {
       return NextResponse.json({ error: 'File too large (max 2 MB)' }, { status: 400 });
     }
@@ -72,34 +158,51 @@ export async function POST(request: NextRequest) {
       );
     }
 
-    // Determine extension from mime type
+    const ext = EXT_BY_MIME[file.type] ?? '.png';
-    const extMap: Record<string, string> = {
+    const safeName = host
-      'image/svg+xml': '.svg',
+      ? domainAssetName(host, slot as BrandingOverrideKey, ext)
-      'image/png': '.png',
+      : sanitizeFilename(`${slot}${ext}`);
-      'image/jpeg': '.jpg',
-      'image/webp': '.webp',
-      'image/x-icon': '.ico',
-      'image/vnd.microsoft.icon': '.ico',
-    };
-    const ext = extMap[file.type] || '.png';
-    const safeName = sanitizeFilename(`${slot}${ext}`);
     const filePath = path.join(getBrandingDir(), safeName);
 
-    // Ensure branding directory exists
     if (!existsSync(getBrandingDir())) {
       await mkdir(getBrandingDir(), { recursive: true });
     }
 
-    // Write file to disk
+    // Strip any prior asset for the same slot but a different extension so
+    // the directory doesn't accumulate orphan files on re-upload.
+    const dir = getBrandingDir();
+    const allFiles = await readdir(dir).catch(() => [] as string[]);
+    for (const f of allFiles) {
+      if (f === safeName) continue;
+      const isSame = host
+        ? isDomainAssetFor(f, host, slot as BrandingOverrideKey)
+        : POSSIBLE_EXTS.some(e => f === `${slot}${e}`);
+      if (isSame) {
+        try { await unlink(path.join(dir, f)); } catch { /* ignore */ }
+      }
+    }
+
     const buffer = Buffer.from(await file.arrayBuffer());
     await writeFile(filePath, buffer);
 
-    // Update config to point to the served URL
     const servedUrl = `/api/admin/branding/${safeName}`;
     await configManager.ensureLoaded();
-    await configManager.setAdminConfig({ [slot]: servedUrl });
 
-    await auditLog('branding_upload', { slot, filename: safeName, size: file.size, mimeType: file.type }, ip);
+    if (host) {
+      const current = parseDomainBranding(configManager.get<unknown>('domainBranding', []));
+      const next = mergeDomainEntry(current, host, { [slot]: servedUrl });
+      await configManager.setAdminConfig({ domainBranding: next });
+    } else {
+      await configManager.setAdminConfig({ [slot]: servedUrl });
+    }
+
+    await auditLog('branding_upload', {
+      slot,
+      host: host || undefined,
+      filename: safeName,
+      size: file.size,
+      mimeType: file.type,
+    }, ip);
 
     return NextResponse.json({ url: servedUrl, filename: safeName });
   } catch (error) {
@@ -111,7 +214,11 @@ export async function POST(request: NextRequest) {
 /**
  * DELETE /api/admin/branding - Remove an uploaded branding file
  *
- * Expects JSON body: { slot: string }
+ * Expects JSON body: { slot: string, host?: string }
+ *
+ * When `host` is provided, only the per-domain asset for that host+slot is
+ * removed (and the override in `domainBranding[host][slot]` is cleared).
+ * Otherwise the global asset and config override are removed.
  */
 export async function DELETE(request: NextRequest) {
   try {
@@ -119,28 +226,48 @@ export async function DELETE(request: NextRequest) {
     if ('error' in result) return result.error;
 
     const ip = getClientIP(request);
-    const { slot } = await request.json();
+    const body = await request.json().catch(() => ({})) as { slot?: string; host?: string };
+    const slot = body.slot;
+    const rawHost = body.host ?? '';
 
-    if (!slot || !VALID_SLOTS.has(slot)) {
+    if (!slot || !VALID_SLOTS.has(slot as UploadSlot)) {
       return NextResponse.json({ error: 'Invalid or missing slot' }, { status: 400 });
     }
 
-    // Find and remove matching files for this slot
+    const host = rawHost ? normalizeHost(rawHost) : '';
-    const possibleExts = ['.svg', '.png', '.jpg', '.webp', '.ico'];
+    if (host && !EXACT_HOST_RE.test(host)) {
+      return NextResponse.json({ error: `Invalid host: ${rawHost}` }, { status: 400 });
+    }
+
+    const dir = getBrandingDir();
     let removed = false;
-    for (const ext of possibleExts) {
+    if (host) {
-      const filePath = path.join(getBrandingDir(), `${slot}${ext}`);
+      const allFiles = await readdir(dir).catch(() => [] as string[]);
-      if (existsSync(filePath)) {
+      for (const f of allFiles) {
-        await unlink(filePath);
+        if (isDomainAssetFor(f, host, slot as BrandingOverrideKey)) {
-        removed = true;
+          try { await unlink(path.join(dir, f)); removed = true; } catch { /* ignore */ }
+        }
+      }
+    } else {
+      for (const ext of POSSIBLE_EXTS) {
+        const filePath = path.join(dir, `${slot}${ext}`);
+        if (existsSync(filePath)) {
+          await unlink(filePath);
+          removed = true;
+        }
       }
     }
 
-    // Clear the config override so it falls back to default/env
     await configManager.ensureLoaded();
-    await configManager.removeAdminOverride(slot);
+    if (host) {
+      const current = parseDomainBranding(configManager.get<unknown>('domainBranding', []));
+      const next = clearDomainKeys(current, host, [slot as BrandingOverrideKey]);
+      await configManager.setAdminConfig({ domainBranding: next });
+    } else {
+      await configManager.removeAdminOverride(slot);
+    }
 
-    await auditLog('branding_delete', { slot, fileRemoved: removed }, ip);
+    await auditLog('branding_delete', { slot, host: host || undefined, fileRemoved: removed }, ip);
 
     return NextResponse.json({ success: true });
   } catch (error) {

app/api/admin/config/route.ts

@@ -4,6 +4,7 @@ import { requireAdminAuth, getClientIP } from '@/lib/admin/session';
 import { auditLog } from '@/lib/admin/audit';
 import { CONFIG_ENV_MAP, SENSITIVE_CONFIG_KEYS } from '@/lib/admin/types';
 import { parseJmapServers } from '@/lib/admin/jmap-servers';
+import { parseDomainBranding } from '@/lib/admin/domain-branding';
 import { logger } from '@/lib/logger';
 
 // Strings that count as "no real secret configured" - used so the dashboard
@@ -88,6 +89,25 @@ export async function PATCH(request: NextRequest) {
       updates.jmapServers = sanitized;
     }
 
+    // Normalize domainBranding: drop entries with an invalid/missing host or
+    // duplicate hosts before persisting. Each entry's branding field strings
+    // are passed through unchanged (URL/string content is the operator's
+    // responsibility, same as the flat branding fields).
+    if ('domainBranding' in updates) {
+      const incoming = updates.domainBranding;
+      if (incoming != null && !Array.isArray(incoming)) {
+        return NextResponse.json({ error: 'domainBranding must be an array' }, { status: 400 });
+      }
+      const sanitized = parseDomainBranding(incoming);
+      const incomingCount = Array.isArray(incoming) ? incoming.length : 0;
+      if (sanitized.length !== incomingCount) {
+        return NextResponse.json({
+          error: 'One or more domainBranding entries are invalid (each needs a unique, valid host).',
+        }, { status: 400 });
+      }
+      updates.domainBranding = sanitized;
+    }
+
     // Get old values for audit
     const oldValues: Record<string, unknown> = {};
     for (const key of Object.keys(updates)) {

app/api/admin/plugins/route.ts

@@ -192,6 +192,9 @@ export async function POST(request: NextRequest) {
       ...(manifest.settingsSchema && typeof manifest.settingsSchema === 'object'
         ? { settingsSchema: manifest.settingsSchema as ServerPlugin['settingsSchema'] }
         : {}),
+      ...(manifest.locales && typeof manifest.locales === 'object'
+        ? { locales: manifest.locales as ServerPlugin['locales'] }
+        : {}),
       ...(declaredFrameOrigins.length > 0
         ? { frameOrigins: declaredFrameOrigins }
         : {}),

app/api/auth/oauth/metadata/route.ts

@@ -0,0 +1,53 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { logger } from '@/lib/logger';
+import { configManager } from '@/lib/admin/config-manager';
+import { getMetadata, getRequiredConfig } from '@/lib/oauth/token-exchange';
+
+/**
+ * Same-origin OAuth metadata (discovery) proxy.
+ *
+ * The login page needs the authorization_endpoint to build the PKCE authorize
+ * URL in the browser. Discovering it directly from the browser means a
+ * cross-origin fetch to the IdP's /.well-known/* documents, which is subject
+ * to CORS: providers like Authentik serve those documents without an
+ * Access-Control-Allow-Origin header, so the browser blocks the response and
+ * discovery fails (issue #382). Performing discovery here - server to server,
+ * where CORS does not apply - and handing the result back as a same-origin
+ * response sidesteps the problem entirely.
+ *
+ * The discovery URL is resolved from admin config (via server_id), never from
+ * client input, so this cannot be abused as an open SSRF proxy. Endpoint URLs
+ * in the discovered document are still gated by the SSRF validator inside
+ * discoverOAuth. The returned fields are public well-known metadata.
+ */
+export async function GET(request: NextRequest) {
+  await configManager.ensureLoaded();
+  const serverId = request.nextUrl.searchParams.get('server_id');
+
+  let discoveryUrl: string;
+  try {
+    ({ discoveryUrl } = getRequiredConfig(serverId));
+  } catch {
+    // OAuth not configured for this server - surface as "no metadata" rather
+    // than a 500 so the login page just hides the SSO button.
+    return NextResponse.json({ error: 'OAuth not configured' }, { status: 404 });
+  }
+
+  try {
+    const metadata = await getMetadata(serverId);
+    if (!metadata?.authorization_endpoint || !metadata.token_endpoint) {
+      logger.warn('OAuth metadata discovery returned no usable endpoints', { discoveryUrl });
+      return NextResponse.json({ error: 'OAuth discovery failed' }, { status: 502 });
+    }
+    return NextResponse.json(metadata, {
+      // Mirror the in-process discovery cache TTL so repeated login-page loads
+      // hit the CDN/browser cache instead of re-running discovery.
+      headers: { 'Cache-Control': 'private, max-age=600' },
+    });
+  } catch (error) {
+    logger.error('OAuth metadata discovery error', {
+      error: error instanceof Error ? error.message : 'Unknown error',
+    });
+    return NextResponse.json({ error: 'OAuth discovery failed' }, { status: 502 });
+  }
+}

app/api/auth/sso/start/route.ts

@@ -3,9 +3,8 @@ import { cookies } from 'next/headers';
 import { logger } from '@/lib/logger';
 import { encryptPayload } from '@/lib/auth/crypto';
 import { generateCodeVerifierServer, generateCodeChallengeServer, generateStateServer } from '@/lib/oauth/pkce-server';
-import { getRequiredConfig } from '@/lib/oauth/token-exchange';
+import { getRequiredConfig, getDiscoveryValidator } from '@/lib/oauth/token-exchange';
 import { discoverOAuth } from '@/lib/oauth/discovery';
-import { isPublicHttpUrl } from '@/lib/security/url-guard';
 import { getOauthScopes } from '@/lib/oauth/tokens';
 import { getCookieOptions } from '@/lib/oauth/cookie-config';
 import { hasSessionSecret } from '@/lib/auth/session-secret';
@@ -62,7 +61,7 @@ export async function POST(request: NextRequest) {
     }
 
     const { clientId, discoveryUrl } = getRequiredConfig(serverId);
-    const metadata = await discoverOAuth(discoveryUrl, { validateEndpoint: isPublicHttpUrl });
+    const metadata = await discoverOAuth(discoveryUrl, { validateEndpoint: getDiscoveryValidator() });
 
     if (!metadata?.authorization_endpoint) {
       return NextResponse.json({ error: 'OAuth discovery failed' }, { status: 502 });

app/api/auth/totp-token-exchange/route.ts

@@ -2,6 +2,7 @@ import { NextRequest, NextResponse } from 'next/server';
 import { cookies } from 'next/headers';
 import { logger } from '@/lib/logger';
 import { discoverOAuth } from '@/lib/oauth/discovery';
+import { getDiscoveryValidator } from '@/lib/oauth/token-exchange';
 import { refreshTokenCookieName, refreshTokenServerCookieName } from '@/lib/oauth/tokens';
 import { getCookieOptions } from '@/lib/oauth/cookie-config';
 import { readFileEnv } from '@/lib/read-file-env';
@@ -52,9 +53,13 @@ async function tryTokenRequest(
   }
 }
 
-async function findTokenEndpoint(serverUrl: string): Promise<string | null> {
+async function findTokenEndpoint(serverUrl: string, adminTrusted: boolean): Promise<string | null> {
+  // Admin-trusted callers (matched server entry or configured JMAP server URL)
+  // honor the `oauthAllowPrivateEndpoints` opt-in. User-supplied URLs always
+  // go through the SSRF validator regardless of the setting.
+  const validateEndpoint = adminTrusted ? getDiscoveryValidator() : isPublicHttpUrl;
   // 1. Try OAuth discovery
-  const metadata = await discoverOAuth(serverUrl, { validateEndpoint: isPublicHttpUrl });
+  const metadata = await discoverOAuth(serverUrl, { validateEndpoint });
   if (metadata?.token_endpoint) return metadata.token_endpoint;
 
   // 2. Try common Stalwart token endpoint paths directly
@@ -105,14 +110,17 @@ export async function POST(request: NextRequest) {
 
     let upstreamUrl: string;
     let resolvedServerId: string | null = null;
+    let adminTrusted = false;
     const requestedEntry = findServerById(serverList, requestedServerId);
     const matchedEntry = requestedEntry || findServerByUrl(serverList, serverUrl);
 
     if (matchedEntry) {
       upstreamUrl = matchedEntry.url;
       resolvedServerId = matchedEntry.id;
+      adminTrusted = true;
     } else if (configuredServerUrl) {
       upstreamUrl = configuredServerUrl;
+      adminTrusted = true;
     } else if (allowCustomEndpoint) {
       if (!(await isPublicHttpUrl(serverUrl))) {
         logger.warn('TOTP token exchange: rejected non-public server URL');
@@ -123,7 +131,7 @@ export async function POST(request: NextRequest) {
       return NextResponse.json({ error: 'jmap_server_not_configured' }, { status: 500 });
     }
 
-    const tokenEndpoint = await findTokenEndpoint(upstreamUrl);
+    const tokenEndpoint = await findTokenEndpoint(upstreamUrl, adminTrusted);
     if (!tokenEndpoint) {
       logger.warn('TOTP token exchange: no token endpoint found');
       return NextResponse.json({ error: 'no_token_endpoint', detail: 'Could not discover OAuth token endpoint on the mail server' }, { status: 404 });

app/api/config/route.ts

@@ -1,9 +1,15 @@
-import { NextResponse } from 'next/server';
+import { NextRequest, NextResponse } from 'next/server';
 import { logger } from '@/lib/logger';
 import { configManager } from '@/lib/admin/config-manager';
 import { parseJmapServers, redactJmapServers } from '@/lib/admin/jmap-servers';
 import { hasSessionSecret } from '@/lib/auth/session-secret';
 import { getOauthScopes } from '@/lib/oauth/tokens';
+import {
+  matchDomainBranding,
+  parseDomainBranding,
+  pickRequestHost,
+  type BrandingOverrideKey,
+} from '@/lib/admin/domain-branding';
 
 /**
  * Runtime configuration endpoint
@@ -13,49 +19,73 @@ import { getOauthScopes } from '@/lib/oauth/tokens';
  * post-build configuration for Docker deployments.
  *
  * Priority order:
- * 1. Admin dashboard overrides (data/admin/config.json)
+ * 1. Per-domain branding override (admin-configured, matched on request host)
- * 2. Runtime env vars (APP_NAME, JMAP_SERVER_URL)
+ * 2. Admin dashboard overrides (data/admin/config.json)
- * 3. Build-time env vars (NEXT_PUBLIC_APP_NAME, NEXT_PUBLIC_JMAP_SERVER_URL)
+ * 3. Runtime env vars (APP_NAME, JMAP_SERVER_URL)
- * 4. Default values
+ * 4. Build-time env vars (NEXT_PUBLIC_APP_NAME, NEXT_PUBLIC_JMAP_SERVER_URL)
+ * 5. Default values
  */
-export async function GET() {
+export async function GET(request: NextRequest) {
   logger.debug('Config requested');
   await configManager.ensureLoaded();
 
-  const appName = configManager.get<string>('appName') || process.env.NEXT_PUBLIC_APP_NAME || 'Webmail';
+  const host = pickRequestHost(request);
+  const domainOverrides = matchDomainBranding(
+    host,
+    parseDomainBranding(configManager.get<unknown>('domainBranding', [])),
+  );
+
+  // Per-domain override wins over the global value, but only when the
+  // entry explicitly sets that key. Otherwise we fall through to the
+  // global admin/env/default chain.
+  const branded = <T,>(key: BrandingOverrideKey, fallback: T): T => {
+    const override = domainOverrides[key];
+    if (typeof override === 'string' && override.length > 0) return override as T;
+    return configManager.get<T>(key, fallback);
+  };
+
+  const appName =
+    branded<string>('appName', '') || process.env.NEXT_PUBLIC_APP_NAME || 'Webmail';
   const jmapServerUrl = configManager.get<string>('jmapServerUrl') || process.env.NEXT_PUBLIC_JMAP_SERVER_URL || '';
   const oauthEnabled = configManager.get<boolean>('oauthEnabled', false);
   const oauthOnly = oauthEnabled && configManager.get<boolean>('oauthOnly', false);
   const stalwartFeaturesEnabled = configManager.get<boolean>('stalwartFeaturesEnabled', true);
   const allowedFrameAncestors = configManager.get<string>('allowedFrameAncestors', '');
 
-  return NextResponse.json({
+  return NextResponse.json(
-    appName,
+    {
-    jmapServerUrl,
+      appName,
-    oauthEnabled,
+      jmapServerUrl,
-    oauthOnly,
+      oauthEnabled,
-    oauthClientId: configManager.get<string>('oauthClientId', ''),
+      oauthOnly,
-    oauthIssuerUrl: configManager.get<string>('oauthIssuerUrl', ''),
+      oauthClientId: configManager.get<string>('oauthClientId', ''),
-    oauthScopes: getOauthScopes(),
+      oauthIssuerUrl: configManager.get<string>('oauthIssuerUrl', ''),
-    rememberMeEnabled: hasSessionSecret(),
+      oauthScopes: getOauthScopes(),
-    settingsSyncEnabled: configManager.get<boolean>('settingsSyncEnabled', false) && hasSessionSecret(),
+      rememberMeEnabled: hasSessionSecret(),
-    stalwartFeaturesEnabled,
+      settingsSyncEnabled: configManager.get<boolean>('settingsSyncEnabled', false) && hasSessionSecret(),
-    devMode: configManager.get<boolean>('devMode', false),
+      stalwartFeaturesEnabled,
-    faviconUrl: configManager.get<string>('faviconUrl', '/branding/Bulwark_Favicon.svg'),
+      devMode: configManager.get<boolean>('devMode', false),
-    appLogoLightUrl: configManager.get<string>('appLogoLightUrl', ''),
+      faviconUrl: branded<string>('faviconUrl', '/branding/Bulwark_Favicon.svg'),
-    appLogoDarkUrl: configManager.get<string>('appLogoDarkUrl', ''),
+      appLogoLightUrl: branded<string>('appLogoLightUrl', ''),
-    loginLogoLightUrl: configManager.get<string>('loginLogoLightUrl', '/branding/Bulwark_Logo_Color.svg'),
+      appLogoDarkUrl: branded<string>('appLogoDarkUrl', ''),
-    loginLogoDarkUrl: configManager.get<string>('loginLogoDarkUrl', '/branding/Bulwark_Logo_White.svg'),
+      loginLogoLightUrl: branded<string>('loginLogoLightUrl', '/branding/Bulwark_Logo_Color.svg'),
-    loginCompanyName: configManager.get<string>('loginCompanyName', ''),
+      loginLogoDarkUrl: branded<string>('loginLogoDarkUrl', '/branding/Bulwark_Logo_White.svg'),
-    loginImprintUrl: configManager.get<string>('loginImprintUrl', ''),
+      loginCompanyName: branded<string>('loginCompanyName', ''),
-    loginPrivacyPolicyUrl: configManager.get<string>('loginPrivacyPolicyUrl', ''),
+      loginImprintUrl: branded<string>('loginImprintUrl', ''),
-    loginWebsiteUrl: configManager.get<string>('loginWebsiteUrl', ''),
+      loginPrivacyPolicyUrl: branded<string>('loginPrivacyPolicyUrl', ''),
-    demoMode: configManager.get<boolean>('demoMode', false),
+      loginWebsiteUrl: branded<string>('loginWebsiteUrl', ''),
-    allowCustomJmapEndpoint: configManager.get<boolean>('allowCustomJmapEndpoint', false),
+      demoMode: configManager.get<boolean>('demoMode', false),
-    jmapServers: redactJmapServers(parseJmapServers(configManager.get<unknown>('jmapServers', []))),
+      allowCustomJmapEndpoint: configManager.get<boolean>('allowCustomJmapEndpoint', false),
-    jmapServerAutoPickByDomain: configManager.get<boolean>('jmapServerAutoPickByDomain', false),
+      jmapServers: redactJmapServers(parseJmapServers(configManager.get<unknown>('jmapServers', []))),
-    autoSsoEnabled: configManager.get<boolean>('autoSsoEnabled', false),
+      jmapServerAutoPickByDomain: configManager.get<boolean>('jmapServerAutoPickByDomain', false),
-    embeddedMode: !!allowedFrameAncestors && allowedFrameAncestors !== "'none'",
+      autoSsoEnabled: configManager.get<boolean>('autoSsoEnabled', false),
-    parentOrigin: configManager.get<string>('parentOrigin', ''),
+      embeddedMode: !!allowedFrameAncestors && allowedFrameAncestors !== "'none'",
-  });
+      parentOrigin: configManager.get<string>('parentOrigin', ''),
+    },
+    {
+      // Branding varies by host, so any cache between us and the browser
+      // must key its entry by the host headers we consulted.
+      headers: { Vary: 'Host, X-Forwarded-Host' },
+    },
+  );
 }

app/api/dev-jmap/[...path]/route.ts

@@ -10,6 +10,8 @@ import { NextRequest, NextResponse } from 'next/server';
  */
 
 const ACCOUNT_ID = 'dev-account-001';
+const scheduledSubmissions: Array<{ id: string; emailId: string; identityId: string; sendAt: string; undoStatus: 'pending' | 'final' | 'canceled' }> = [];
+const emailCreationIds = new Map<string, string>();
 
 // ---------------------------------------------------------------------------
 // Mailboxes
@@ -721,7 +723,18 @@ const emails: MockEmail[] = [
 // Identities
 // ---------------------------------------------------------------------------
 
-const IDENTITIES = [
+type MockIdentity = {
+  id: string;
+  name: string;
+  email: string;
+  replyTo: Array<{ name?: string; email: string }> | null;
+  bcc: Array<{ name?: string; email: string }> | null;
+  textSignature: string | null;
+  htmlSignature: string | null;
+  mayDelete: boolean;
+};
+
+const IDENTITIES: MockIdentity[] = [
   {
     id: 'identity-001',
     name: 'Dev User',
@@ -1533,6 +1546,7 @@ function handleEmailSet(args: MethodArgs, callId: string): MethodResult {
         bodyValues: {},
       };
       emails.unshift(newEmail);
+      emailCreationIds.set(key, newId);
       created[key] = { id: newId };
     }
   }
@@ -1559,13 +1573,55 @@ function handleIdentityGet(_args: MethodArgs, callId: string): MethodResult {
 
 function handleIdentitySet(args: MethodArgs, callId: string): MethodResult {
   const created: Record<string, { id: string }> = {};
-  const create = args.create as Record<string, unknown> | undefined;
+  const updated: Record<string, null> = {};
+  const destroyed: string[] = [];
+
+  const create = args.create as Record<string, Record<string, unknown>> | undefined;
   if (create) {
-    for (const key of Object.keys(create)) {
+    for (const [key, data] of Object.entries(create)) {
-      created[key] = { id: `identity-new-${Date.now()}-${key}` };
+      const newId = `identity-${Date.now()}-${key}`;
+      IDENTITIES.push({
+        id: newId,
+        name: (data.name as string) || '',
+        email: (data.email as string) || '',
+        replyTo: (data.replyTo as MockIdentity['replyTo']) ?? null,
+        bcc: (data.bcc as MockIdentity['bcc']) ?? null,
+        textSignature: (data.textSignature as string | null) ?? null,
+        htmlSignature: (data.htmlSignature as string | null) ?? null,
+        mayDelete: true,
+      });
+      created[key] = { id: newId };
     }
   }
-  return ['Identity/set', { accountId: ACCOUNT_ID, oldState: nextState(), newState: nextState(), created, updated: null, destroyed: null }, callId];
+
+  const update = args.update as Record<string, Record<string, unknown>> | undefined;
+  if (update) {
+    for (const [id, changes] of Object.entries(update)) {
+      const identity = IDENTITIES.find((i) => i.id === id);
+      if (identity) {
+        // Email is immutable per the identity form, so it's never in `changes`.
+        if (changes.name !== undefined) identity.name = changes.name as string;
+        if (changes.replyTo !== undefined) identity.replyTo = changes.replyTo as MockIdentity['replyTo'];
+        if (changes.bcc !== undefined) identity.bcc = changes.bcc as MockIdentity['bcc'];
+        if (changes.textSignature !== undefined) identity.textSignature = changes.textSignature as string | null;
+        if (changes.htmlSignature !== undefined) identity.htmlSignature = changes.htmlSignature as string | null;
+        updated[id] = null;
+      }
+    }
+  }
+
+  const destroy = args.destroy as string[] | undefined;
+  if (destroy) {
+    for (const id of destroy) {
+      const idx = IDENTITIES.findIndex((i) => i.id === id);
+      if (idx !== -1) {
+        IDENTITIES.splice(idx, 1);
+        destroyed.push(id);
+      }
+    }
+  }
+
+  return ['Identity/set', { accountId: ACCOUNT_ID, oldState: nextState(), newState: nextState(), created, updated, destroyed, notCreated: null, notUpdated: null, notDestroyed: null }, callId];
 }
 
 function handleThreadGet(args: MethodArgs, callId: string): MethodResult {
@@ -1575,8 +1631,51 @@ function handleThreadGet(args: MethodArgs, callId: string): MethodResult {
   return ['Thread/get', { accountId: ACCOUNT_ID, state: nextState(), list, notFound: [] }, callId];
 }
 
-function handleEmailSubmissionSet(_args: MethodArgs, callId: string): MethodResult {
+function handleEmailSubmissionSet(args: MethodArgs, callId: string): MethodResult {
-  return ['EmailSubmission/set', { accountId: ACCOUNT_ID, oldState: nextState(), newState: nextState(), created: { 'sub-1': { id: 'sub-mock-1' } }, notCreated: null }, callId];
+  const created: Record<string, { id: string; sendAt?: string }> = {};
+  const updated: Record<string, null> = {};
+  const create = args.create as Record<string, { emailId?: string; identityId?: string; envelope?: { mailFrom?: { parameters?: { HOLDFOR?: string; HOLDUNTIL?: string } } } }> | undefined;
+  if (create) {
+    for (const [key, value] of Object.entries(create)) {
+      const id = `submission-${Date.now()}-${key}`;
+      const holdFor = value.envelope?.mailFrom?.parameters?.HOLDFOR;
+      const holdUntil = value.envelope?.mailFrom?.parameters?.HOLDUNTIL;
+      const holdForSeconds = holdFor ? Number(holdFor) : Number.NaN;
+      const holdUntilTime = Number.isFinite(holdForSeconds) && holdForSeconds > 0
+        ? Date.now() + holdForSeconds * 1000
+        : holdUntil ? new Date(holdUntil).getTime() : Number.NaN;
+      const delayedUntil = Number.isFinite(holdUntilTime) ? new Date(holdUntilTime).toISOString() : undefined;
+      created[key] = { id, ...(delayedUntil ? { sendAt: delayedUntil } : {}) };
+      if (delayedUntil && value.emailId && value.identityId) {
+        const emailId = value.emailId.startsWith('#') ? emailCreationIds.get(value.emailId.slice(1)) || value.emailId : value.emailId;
+        scheduledSubmissions.push({ id, emailId, identityId: value.identityId, sendAt: delayedUntil, undoStatus: 'pending' });
+      }
+    }
+  }
+  const update = args.update as Record<string, { undoStatus?: 'pending' | 'final' | 'canceled' }> | undefined;
+  if (update) {
+    for (const [id, patch] of Object.entries(update)) {
+      const submission = scheduledSubmissions.find(s => s.id === id);
+      if (submission && patch.undoStatus) {
+        submission.undoStatus = patch.undoStatus;
+        updated[id] = null;
+      }
+    }
+  }
+  return ['EmailSubmission/set', { accountId: ACCOUNT_ID, oldState: nextState(), newState: nextState(), created, updated, notCreated: null, notUpdated: null }, callId];
+}
+
+function handleEmailSubmissionQuery(args: MethodArgs, callId: string): MethodResult {
+  const position = Number(args.position || 0);
+  const limit = Number(args.limit || 50);
+  const submissions = [...scheduledSubmissions].sort((a, b) => new Date(a.sendAt).getTime() - new Date(b.sendAt).getTime());
+  return ['EmailSubmission/query', { accountId: ACCOUNT_ID, queryState: nextState(), ids: submissions.slice(position, position + limit).map(s => s.id), total: submissions.length, position, canCalculateChanges: false }, callId];
+}
+
+function handleEmailSubmissionGet(args: MethodArgs, callId: string): MethodResult {
+  const ids = args.ids as string[] | undefined;
+  const list = ids ? scheduledSubmissions.filter(s => ids.includes(s.id)) : scheduledSubmissions;
+  return ['EmailSubmission/get', { accountId: ACCOUNT_ID, state: nextState(), list, notFound: [] }, callId];
 }
 
 function handleQuotaGet(_args: MethodArgs, callId: string): MethodResult {
@@ -1639,6 +1738,8 @@ const METHOD_HANDLERS: Record<string, (args: MethodArgs, callId: string) => Meth
   'Identity/get': handleIdentityGet,
   'Identity/set': handleIdentitySet,
   'EmailSubmission/set': handleEmailSubmissionSet,
+  'EmailSubmission/query': handleEmailSubmissionQuery,
+  'EmailSubmission/get': handleEmailSubmissionGet,
   'Quota/get': handleQuotaGet,
   'VacationResponse/get': handleVacationResponseGet,
   'VacationResponse/set': (_args, callId) => ['VacationResponse/set', { accountId: ACCOUNT_ID, oldState: nextState(), newState: nextState(), updated: { 'vacation-1': null } }, callId],
@@ -1776,7 +1877,7 @@ export async function GET(request: NextRequest, { params }: { params: Promise<{
           isReadOnly: false,
           accountCapabilities: {
             'urn:ietf:params:jmap:mail': {},
-            'urn:ietf:params:jmap:submission': {},
+            'urn:ietf:params:jmap:submission': { maxDelayedSend: 2592000, submissionExtensions: { FUTURERELEASE: true } },
             'urn:ietf:params:jmap:quota': {},
             'urn:ietf:params:jmap:vacationresponse': {},
             'urn:ietf:params:jmap:contacts': {},

app/api/favicon/route.ts

@@ -19,6 +19,20 @@ const negativeCache = new Map<string, NegativeCacheEntry>();
 const NEGATIVE_CACHE_TTL_MS = 24 * 60 * 60 * 1000; // 1 day
 const NEGATIVE_CACHE_MAX_SIZE = 2000;
 
+// 1x1 transparent PNG. Returned with HTTP 200 (instead of 404) when no
+// favicon exists for a domain, so the browser's <img> tag loads it cleanly
+// without spamming the DevTools console with red 404 errors. Avatar.tsx
+// checks `naturalWidth <= 1` in onLoad and falls back to initials.
+const TRANSPARENT_PNG = Buffer.from(
+  'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNgAAIAAAUAAen63NgAAAAASUVORK5CYII=',
+  'base64',
+);
+const MISSING_FAVICON_HEADERS = {
+  'Content-Type': 'image/png',
+  'Cache-Control': 'public, max-age=86400', // 1 day
+  'X-Bulwark-Favicon': 'missing',
+};
+
 // Strict domain validation to prevent SSRF
 const DOMAIN_RE = /^[a-z0-9]([a-z0-9-]*[a-z0-9])?(\.[a-z0-9]([a-z0-9-]*[a-z0-9])?)+$/i;
 
@@ -434,10 +448,7 @@ export async function GET(request: NextRequest) {
   // Check negative cache (domains known to have no favicon)
   const neg = negativeCache.get(normalizedDomain);
   if (neg && Date.now() - neg.fetchedAt < NEGATIVE_CACHE_TTL_MS) {
-    return new NextResponse(null, {
+    return new NextResponse(TRANSPARENT_PNG, { headers: MISSING_FAVICON_HEADERS });
-      status: 404,
-      headers: { 'Cache-Control': 'public, max-age=86400' }, // 1 day
-    });
   }
 
   // Check cache
@@ -460,10 +471,7 @@ export async function GET(request: NextRequest) {
     if (!upstream.ok) {
       evictNegativeOldest();
       negativeCache.set(normalizedDomain, { fetchedAt: Date.now() });
-      return new NextResponse(null, {
+      return new NextResponse(TRANSPARENT_PNG, { headers: MISSING_FAVICON_HEADERS });
-        status: 404,
-        headers: { 'Cache-Control': 'public, max-age=86400' },
-      });
     }
 
     const contentType = upstream.headers.get('content-type') || 'image/x-icon';
@@ -473,10 +481,7 @@ export async function GET(request: NextRequest) {
     if (data.byteLength < 10) {
       evictNegativeOldest();
       negativeCache.set(normalizedDomain, { fetchedAt: Date.now() });
-      return new NextResponse(null, {
+      return new NextResponse(TRANSPARENT_PNG, { headers: MISSING_FAVICON_HEADERS });
-        status: 404,
-        headers: { 'Cache-Control': 'public, max-age=86400' },
-      });
     }
 
     // Cache the result

app/api/plugins/route.ts

@@ -57,6 +57,9 @@ export async function GET() {
       // Per-user settings schema, captured from the manifest at upload/load
       // time so the client can render the settings UI without re-parsing.
       settingsSchema: p.settingsSchema,
+      // Plugin-declared i18n tables, so the sandbox can localize plugin
+      // strings via api.i18n.t().
+      locales: p.locales,
     }));
 
     // Only serve enabled themes

app/api/pwa-icon/[size]/route.ts

@@ -4,6 +4,11 @@ import path from 'node:path';
 import { readFile } from 'node:fs/promises';
 import { configManager } from '@/lib/admin/config-manager';
 import { getConfigDir } from '@/lib/admin/paths';
+import {
+  matchDomainBranding,
+  parseDomainBranding,
+  pickRequestHost,
+} from '@/lib/admin/domain-branding';
 
 const VALID_SIZES = new Set([192, 512]);
 
@@ -33,7 +38,7 @@ async function fetchSourceImage(iconUrl: string): Promise<Buffer> {
 }
 
 export async function GET(
-  _req: NextRequest,
+  req: NextRequest,
   { params }: { params: Promise<{ size: string }> }
 ) {
   const { size: sizeParam } = await params;
@@ -44,8 +49,15 @@ export async function GET(
   }
 
   await configManager.ensureLoaded();
+  const host = pickRequestHost(req);
+  const domainOverrides = matchDomainBranding(
+    host,
+    parseDomainBranding(configManager.get<unknown>('domainBranding', [])),
+  );
   const sources = configManager.getAllWithSources();
   const iconUrl =
+    domainOverrides.pwaIconUrl ||
+    domainOverrides.faviconUrl ||
     (sources.pwaIconUrl?.source !== 'default' ? (sources.pwaIconUrl?.value as string) : '') ||
     (sources.faviconUrl?.source !== 'default' ? (sources.faviconUrl?.value as string) : '');
   if (!iconUrl) {
@@ -55,6 +67,7 @@ export async function GET(
   const pngHeaders = {
     'Content-Type': 'image/png',
     'Cache-Control': 'public, max-age=86400',
+    Vary: 'Host, X-Forwarded-Host',
   };
 
   const cacheKey = `${size}|${iconUrl}`;

app/api/pwa-screenshot/[variant]/route.ts

@@ -0,0 +1,104 @@
+import { NextRequest, NextResponse } from 'next/server';
+import sharp from 'sharp';
+import path from 'node:path';
+import { readFile } from 'node:fs/promises';
+import { configManager } from '@/lib/admin/config-manager';
+import { getConfigDir } from '@/lib/admin/paths';
+import {
+  matchDomainBranding,
+  parseDomainBranding,
+  pickRequestHost,
+} from '@/lib/admin/domain-branding';
+
+/**
+ * Variant → target output size + admin config key.
+ * Matches the sizes declared in app/manifest.ts so the rendered PNG fits
+ * the slot the manifest tells the browser about.
+ */
+const VARIANTS = {
+  mobile: { width: 540, height: 720, configKey: 'pwaScreenshotMobileUrl' as const },
+  desktop: { width: 1280, height: 720, configKey: 'pwaScreenshotDesktopUrl' as const },
+} as const;
+
+type Variant = keyof typeof VARIANTS;
+
+// Cache resized images keyed by (variant, source URL).
+const cache = new Map<string, Blob>();
+
+async function fetchSourceImage(iconUrl: string): Promise<Buffer> {
+  if (iconUrl.startsWith('http://') || iconUrl.startsWith('https://')) {
+    const res = await fetch(iconUrl);
+    if (!res.ok) throw new Error(`Failed to fetch PWA screenshot: ${res.status}`);
+    return Buffer.from(await res.arrayBuffer());
+  }
+
+  // Admin-uploaded branding asset: served from /api/admin/branding/<file>
+  // but stored on disk under getConfigDir()/branding/.
+  const ADMIN_BRANDING_PREFIX = '/api/admin/branding/';
+  if (iconUrl.startsWith(ADMIN_BRANDING_PREFIX)) {
+    const filename = path.basename(iconUrl.slice(ADMIN_BRANDING_PREFIX.length));
+    return readFile(path.join(getConfigDir(), 'branding', filename));
+  }
+
+  // Path relative to public/ directory
+  const publicPath = path.join(process.cwd(), 'public', iconUrl.replace(/^\//, ''));
+  return readFile(publicPath);
+}
+
+export async function GET(
+  req: NextRequest,
+  { params }: { params: Promise<{ variant: string }> },
+) {
+  const { variant: variantParam } = await params;
+  if (!(variantParam in VARIANTS)) {
+    return new NextResponse('Invalid variant. Allowed: mobile, desktop', { status: 400 });
+  }
+  const { width, height, configKey } = VARIANTS[variantParam as Variant];
+
+  await configManager.ensureLoaded();
+  const host = pickRequestHost(req);
+  const domainOverrides = matchDomainBranding(
+    host,
+    parseDomainBranding(configManager.get<unknown>('domainBranding', [])),
+  );
+  const sources = configManager.getAllWithSources();
+  const sourceEntry = sources[configKey];
+  const screenshotUrl =
+    domainOverrides[configKey] ||
+    (sourceEntry?.source !== 'default' ? (sourceEntry?.value as string | undefined) : undefined);
+  if (!screenshotUrl) {
+    return new NextResponse('No PWA screenshot configured', { status: 404 });
+  }
+
+  const pngHeaders = {
+    'Content-Type': 'image/png',
+    'Cache-Control': 'public, max-age=86400',
+    Vary: 'Host, X-Forwarded-Host',
+  };
+  const cacheKey = `${variantParam}|${screenshotUrl}`;
+
+  try {
+    if (cache.has(cacheKey)) {
+      return new NextResponse(cache.get(cacheKey)!, { headers: pngHeaders });
+    }
+
+    const sourceBuffer = await fetchSourceImage(screenshotUrl);
+    // 'cover' fills the target box without letterboxing - screenshots benefit
+    // more from cropping than from a transparent frame around them. Users get
+    // a hint about the recommended aspect ratio in the admin UI.
+    const resized = await sharp(sourceBuffer)
+      .resize(width, height, { fit: 'cover', position: 'center' })
+      .png()
+      .toBuffer();
+
+    const ab = new ArrayBuffer(resized.byteLength);
+    new Uint8Array(ab).set(resized);
+    const blob = new Blob([ab], { type: 'image/png' });
+    cache.set(cacheKey, blob);
+
+    return new NextResponse(blob, { headers: pngHeaders });
+  } catch (err) {
+    console.error('Failed to generate PWA screenshot:', err);
+    return new NextResponse('Failed to generate screenshot', { status: 500 });
+  }
+}

app/api/setup/branding/route.ts

@@ -23,10 +23,13 @@ const ALLOWED_MIME_TYPES = new Set([
 
 const VALID_SLOTS = new Set([
   'faviconUrl',
+  'pwaIconUrl',
   'appLogoLightUrl',
   'appLogoDarkUrl',
   'loginLogoLightUrl',
   'loginLogoDarkUrl',
+  'pwaScreenshotMobileUrl',
+  'pwaScreenshotDesktopUrl',
 ]);
 
 const EXT_BY_MIME: Record<string, string> = {

app/api/translate/route.ts

@@ -0,0 +1,298 @@
+import { NextRequest, NextResponse } from 'next/server';
+
+// Host-side proxy backing the "Translate" plugin (manifest apiPostPaths:
+// ["/api/translate"]). The plugin slot iframe POSTs { text, target, source,
+// provider } here via api.http.post; we forward to a free translation backend
+// and return { translatedText, detectedSource } in a stable shape.
+//
+// Two providers:
+//   - "mymemory"     — public MyMemory API, no configuration required. Its
+//                       langpair needs an explicit source language, so when the
+//                       plugin asks for "auto" we detect it locally first.
+//   - "libretranslate" — only available when the host sets LIBRETRANSLATE_URL
+//                       (and optionally LIBRETRANSLATE_API_KEY). Supports native
+//                       source auto-detection.
+
+export const runtime = 'nodejs';
+
+const MAX_CHARS = 5000;
+// Long bodies are split into ~480-char chunks for MyMemory and translated
+// sequentially, so allow enough headroom for ~10 round-trips.
+const TIMEOUT_MS = 25000;
+
+type Provider = 'mymemory' | 'libretranslate';
+
+interface TranslateBody {
+  text?: unknown;
+  target?: unknown;
+  source?: unknown;
+  provider?: unknown;
+}
+
+interface TranslateResult {
+  translatedText: string;
+  detectedSource?: string;
+}
+
+// ─── Lightweight language detection ───────────────────────────
+//
+// MyMemory has no auto-detect, so we infer a source language from the text.
+// Non-Latin scripts are decided by Unicode range; Latin-script European
+// languages are scored by stop-word frequency. Detection only needs to be good
+// enough to (a) pick a sensible langpair and (b) let the plugin skip messages
+// already in the target language.
+
+const SCRIPT_RANGES: ReadonlyArray<[RegExp, string]> = [
+  [/[぀-ヿ]/, 'ja'], // Hiragana / Katakana
+  [/[가-힯]/, 'ko'], // Hangul
+  [/[一-鿿]/, 'zh'], // CJK ideographs (after JP/KR checks)
+  [/[Ѐ-ӿ]/, 'ru'], // Cyrillic (ru vs uk refined below)
+  [/[Ͱ-Ͽ]/, 'el'], // Greek
+  [/[؀-ۿ]/, 'ar'], // Arabic
+  [/[֐-׿]/, 'he'], // Hebrew
+  [/[ऀ-ॿ]/, 'hi'], // Devanagari
+];
+
+// Distinctive stop words per Latin-script language from the manifest's option
+// list. Kept small and high-signal to avoid cross-language collisions.
+const LATIN_STOPWORDS: Record<string, readonly string[]> = {
+  en: ['the', 'and', 'you', 'that', 'with', 'for', 'this', 'have', 'are'],
+  de: ['der', 'die', 'und', 'das', 'ist', 'nicht', 'mit', 'sie', 'ein', 'auch'],
+  fr: ['les', 'des', 'une', 'est', 'pour', 'que', 'vous', 'dans', 'avec', 'pas'],
+  es: ['que', 'los', 'una', 'por', 'con', 'para', 'como', 'pero', 'más', 'esta'],
+  it: ['che', 'non', 'per', 'una', 'sono', 'con', 'come', 'questo', 'anche', 'della'],
+  pt: ['que', 'não', 'uma', 'com', 'para', 'como', 'mais', 'você', 'está', 'isso'],
+  nl: ['het', 'een', 'van', 'dat', 'niet', 'met', 'voor', 'aan', 'zijn', 'maar'],
+  pl: ['nie', 'jest', 'się', 'ale', 'oraz', 'tego', 'jak', 'tym', 'przez', 'dla'],
+  sv: ['och', 'att', 'det', 'som', 'för', 'med', 'inte', 'den', 'till', 'har'],
+  no: ['og', 'det', 'som', 'for', 'med', 'ikke', 'har', 'til', 'denne', 'jeg'],
+  da: ['og', 'det', 'som', 'for', 'med', 'ikke', 'har', 'til', 'denne', 'jeg'],
+  fi: ['että', 'olen', 'tämä', 'kanssa', 'mutta', 'sekä', 'ei', 'on', 'ja', 'jotta'],
+  cs: ['není', 'jsem', 'pro', 'ale', 'jako', 'tento', 'také', 'přes', 'jsou', 'své'],
+  ro: ['este', 'pentru', 'care', 'dar', 'sunt', 'această', 'mai', 'din', 'sau', 'nu'],
+  hu: ['hogy', 'nem', 'egy', 'van', 'ezt', 'vagy', 'mint', 'csak', 'ezzel', 'így'],
+  tr: ['bir', 'için', 'değil', 'bu', 'çok', 'daha', 'ama', 'gibi', 've', 'ile'],
+};
+
+function detectLanguage(text: string): string {
+  const sample = text.slice(0, 1000);
+  for (const [range, lang] of SCRIPT_RANGES) {
+    if (range.test(sample)) {
+      // Ukrainian shares Cyrillic with Russian; its unique glyphs decide it.
+      if (lang === 'ru' && /[єіїґ]/.test(sample)) return 'uk';
+      return lang;
+    }
+  }
+
+  const words = sample.toLowerCase().match(/[a-zà-ÿčśžłńęąółżźć]+/gi) || [];
+  if (words.length === 0) return 'en';
+  const counts: Record<string, number> = {};
+  const wordSet = new Set(words);
+  for (const [lang, stops] of Object.entries(LATIN_STOPWORDS)) {
+    let score = 0;
+    for (const stop of stops) if (wordSet.has(stop)) score += 1;
+    counts[lang] = score;
+  }
+  let best = 'en';
+  let bestScore = -1;
+  for (const [lang, score] of Object.entries(counts)) {
+    if (score > bestScore) {
+      best = lang;
+      bestScore = score;
+    }
+  }
+  return bestScore > 0 ? best : 'en';
+}
+
+function baseLang(code: string): string {
+  return String(code || '').toLowerCase().split('-')[0];
+}
+
+// ─── Chunking ─────────────────────────────────────────────────
+//
+// MyMemory's free endpoint caps each request's `q` at 500 characters and
+// silently returns only the translated prefix beyond that — which is why long
+// emails came back truncated ("…about Sel…"). We split the text into
+// line-aware chunks under the limit, translate each, then rejoin so the whole
+// body is covered.
+
+const MYMEMORY_CHUNK = 480;
+
+function chunkText(text: string, max: number): string[] {
+  const chunks: string[] = [];
+  let cur = '';
+  const flush = () => {
+    if (cur) {
+      chunks.push(cur);
+      cur = '';
+    }
+  };
+  for (const line of text.split('\n')) {
+    if (line.length > max) {
+      flush();
+      // A single over-long line (e.g. a long URL list): split on words, and
+      // hard-cut any word that is itself longer than the limit.
+      let seg = '';
+      for (const word of line.split(' ')) {
+        const piece = seg ? seg + ' ' + word : word;
+        if (piece.length > max) {
+          if (seg) {
+            chunks.push(seg);
+            seg = '';
+          }
+          if (word.length > max) {
+            for (let i = 0; i < word.length; i += max) chunks.push(word.slice(i, i + max));
+          } else {
+            seg = word;
+          }
+        } else {
+          seg = piece;
+        }
+      }
+      if (seg) chunks.push(seg);
+      continue;
+    }
+    if (cur && cur.length + 1 + line.length > max) flush();
+    cur = cur ? cur + '\n' + line : line;
+  }
+  flush();
+  return chunks;
+}
+
+// ─── Providers ────────────────────────────────────────────────
+
+async function mymemoryRequest(
+  q: string,
+  langpair: string,
+  signal: AbortSignal,
+): Promise<string> {
+  const url = new URL('https://api.mymemory.translated.net/get');
+  url.searchParams.set('q', q);
+  url.searchParams.set('langpair', langpair);
+
+  const res = await fetch(url.toString(), {
+    signal,
+    headers: { 'User-Agent': 'JMAP-Webmail/1.0 Translate-Plugin' },
+  });
+  const data = (await res.json().catch(() => null)) as
+    | { responseStatus?: number | string; responseData?: { translatedText?: string }; responseDetails?: string }
+    | null;
+  if (!res.ok || !data) {
+    throw new Error(`MyMemory returned ${res.status}`);
+  }
+  const status = Number(data.responseStatus);
+  if (status && status !== 200) {
+    throw new Error(data.responseDetails || `MyMemory error ${status}`);
+  }
+  const translatedText = data.responseData?.translatedText || '';
+  if (!translatedText) {
+    throw new Error('MyMemory returned no translation');
+  }
+  return translatedText;
+}
+
+async function translateMyMemory(
+  text: string,
+  source: string,
+  target: string,
+  signal: AbortSignal,
+): Promise<TranslateResult> {
+  const detected = source === 'auto' || !source ? detectLanguage(text) : baseLang(source);
+  const tgt = baseLang(target);
+  // Nothing to do if already in the target language; the plugin skips display.
+  if (detected === tgt) {
+    return { translatedText: text, detectedSource: detected };
+  }
+  const langpair = `${detected}|${tgt}`;
+  const chunks = chunkText(text, MYMEMORY_CHUNK);
+  // Sequential to stay friendly to MyMemory's free-tier rate limits; emails are
+  // usually one or two chunks.
+  const translated: string[] = [];
+  for (const chunk of chunks) {
+    translated.push(await mymemoryRequest(chunk, langpair, signal));
+  }
+  return { translatedText: translated.join('\n'), detectedSource: detected };
+}
+
+async function translateLibre(
+  text: string,
+  source: string,
+  target: string,
+  signal: AbortSignal,
+): Promise<TranslateResult> {
+  const endpoint = process.env.LIBRETRANSLATE_URL;
+  if (!endpoint) {
+    throw new Error('LibreTranslate is not configured on this server');
+  }
+  const apiKey = process.env.LIBRETRANSLATE_API_KEY;
+  const url = endpoint.replace(/\/+$/, '') + '/translate';
+  const res = await fetch(url, {
+    method: 'POST',
+    signal,
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({
+      q: text,
+      source: source || 'auto',
+      target: baseLang(target),
+      format: 'text',
+      ...(apiKey ? { api_key: apiKey } : {}),
+    }),
+  });
+  const data = (await res.json().catch(() => null)) as
+    | { translatedText?: string; detectedLanguage?: { language?: string }; error?: string }
+    | null;
+  if (!res.ok || !data) {
+    throw new Error(data?.error || `LibreTranslate returned ${res.status}`);
+  }
+  if (!data.translatedText) {
+    throw new Error(data.error || 'LibreTranslate returned no translation');
+  }
+  return {
+    translatedText: data.translatedText,
+    detectedSource: data.detectedLanguage?.language || (source !== 'auto' ? baseLang(source) : undefined),
+  };
+}
+
+// ─── Route ────────────────────────────────────────────────────
+
+export async function POST(request: NextRequest) {
+  let body: TranslateBody;
+  try {
+    body = (await request.json()) as TranslateBody;
+  } catch {
+    return NextResponse.json({ error: 'Invalid request body' }, { status: 400 });
+  }
+
+  const text = typeof body.text === 'string' ? body.text.trim() : '';
+  const target = typeof body.target === 'string' && body.target.trim() ? body.target.trim() : 'en';
+  const source = typeof body.source === 'string' && body.source.trim() ? body.source.trim() : 'auto';
+  const provider: Provider = body.provider === 'libretranslate' ? 'libretranslate' : 'mymemory';
+
+  if (!text) {
+    return NextResponse.json({ error: 'No text to translate' }, { status: 400 });
+  }
+  if (text.length > MAX_CHARS) {
+    return NextResponse.json(
+      { error: `Text exceeds the ${MAX_CHARS}-character limit` },
+      { status: 413 },
+    );
+  }
+
+  const controller = new AbortController();
+  const timeout = setTimeout(() => controller.abort(), TIMEOUT_MS);
+  try {
+    const result =
+      provider === 'libretranslate'
+        ? await translateLibre(text, source, target, controller.signal)
+        : await translateMyMemory(text, source, target, controller.signal);
+    return NextResponse.json(result, { status: 200 });
+  } catch (error: unknown) {
+    if (error instanceof Error && error.name === 'AbortError') {
+      return NextResponse.json({ error: 'Translation timed out' }, { status: 504 });
+    }
+    const message = error instanceof Error ? error.message : 'Translation failed';
+    return NextResponse.json({ error: message }, { status: 502 });
+  } finally {
+    clearTimeout(timeout);
+  }
+}

app/globals.css

@@ -70,7 +70,7 @@
 }
 
 .dark {
-  --color-border: #262626;
+  --color-border: rgba(128, 128, 128, 0.3);
   --color-input: #262626;
   --color-ring: #d4d4d4;
   --color-background: #0a0a0a;
@@ -242,8 +242,8 @@ body {
 
 @media (max-width: 640px) {
   .email-content-text {
-    padding-left: 0;
+    padding-left: 0.75rem;
-    padding-right: 0;
+    padding-right: 0.75rem;
   }
 }
 

app/manifest.ts

@@ -1,5 +1,12 @@
 import type { MetadataRoute } from "next";
+import { headers } from "next/headers";
 import { configManager } from "@/lib/admin/config-manager";
+import {
+  matchDomainBranding,
+  parseDomainBranding,
+  pickRequestHost,
+  type BrandingOverrideKey,
+} from "@/lib/admin/domain-branding";
 
 export const dynamic = "force-dynamic";
 
@@ -25,25 +32,40 @@ const withBase = (p: string) => `${BASE_PATH}${p}`;
 export default async function manifest(): Promise<ExtendedManifest> {
   await configManager.ensureLoaded();
 
+  const host = pickRequestHost(await headers());
+  const domainOverrides = matchDomainBranding(
+    host,
+    parseDomainBranding(configManager.get<unknown>("domainBranding", [])),
+  );
+  const branded = <T,>(key: BrandingOverrideKey, fallback: T): T => {
+    const override = domainOverrides[key];
+    if (typeof override === "string" && override.length > 0) return override as T;
+    return configManager.get<T>(key, fallback);
+  };
+
   const appName =
-    configManager.get<string>("appName") ||
+    branded<string>("appName", "") ||
     process.env.NEXT_PUBLIC_APP_NAME ||
     "Bulwark Webmail";
 
-  const shortName = configManager.get<string>("appShortName") || appName;
+  const shortName = branded<string>("appShortName", "") || appName;
   const description =
-    configManager.get<string>("appDescription") ||
+    branded<string>("appDescription", "") ||
     "A modern webmail client built for Stalwart Mail Server";
-  const themeColor = configManager.get<string>("pwaThemeColor") || "#ffffff";
+  const themeColor = branded<string>("pwaThemeColor", "") || "#ffffff";
-  const backgroundColor = configManager.get<string>("pwaBackgroundColor") || "#ffffff";
+  const backgroundColor = branded<string>("pwaBackgroundColor", "") || "#ffffff";
 
-  // If pwaIconUrl or faviconUrl was explicitly configured (admin override or
+  // If pwaIconUrl or faviconUrl was explicitly configured (admin override,
-  // env var), serve dynamically resized PNGs via /api/pwa-icon/[size].
+  // env var, or per-domain override), serve dynamically resized PNGs via
-  // Otherwise fall back to the static Bulwark PNGs - sources marked "default"
+  // /api/pwa-icon/[size]. Otherwise fall back to the static Bulwark PNGs -
-  // are the built-in placeholder paths and not real custom icons.
+  // sources marked "default" are the built-in placeholder paths and not
+  // real custom icons.
   const sources = configManager.getAllWithSources();
   const hasCustomIcon =
-    sources.pwaIconUrl?.source !== "default" || sources.faviconUrl?.source !== "default";
+    !!domainOverrides.pwaIconUrl ||
+    !!domainOverrides.faviconUrl ||
+    sources.pwaIconUrl?.source !== "default" ||
+    sources.faviconUrl?.source !== "default";
 
   const icons: MetadataRoute.Manifest["icons"] = hasCustomIcon
     ? [
@@ -73,10 +95,25 @@ export default async function manifest(): Promise<ExtendedManifest> {
     background_color: backgroundColor,
     icons,
     categories: ["productivity"],
-    screenshots: [
+    // Use admin-uploaded screenshots when configured (per-domain override,
-      { src: withBase("/screenshot-540x720.png"), sizes: "540x720", type: "image/png" },
+    // admin/env global; resized on the fly via /api/pwa-screenshot/[variant]);
-      { src: withBase("/screenshot-1280x720.png"), sizes: "1280x720", type: "image/png" },
+    // otherwise fall back to the built-in Bulwark screenshots from public/.
-    ],
+    screenshots: (() => {
+      const hasMobile =
+        !!domainOverrides.pwaScreenshotMobileUrl ||
+        sources.pwaScreenshotMobileUrl?.source !== "default";
+      const hasDesktop =
+        !!domainOverrides.pwaScreenshotDesktopUrl ||
+        sources.pwaScreenshotDesktopUrl?.source !== "default";
+      return [
+        hasMobile
+          ? { src: withBase("/api/pwa-screenshot/mobile"), sizes: "540x720", type: "image/png" }
+          : { src: withBase("/screenshot-540x720.png"), sizes: "540x720", type: "image/png" },
+        hasDesktop
+          ? { src: withBase("/api/pwa-screenshot/desktop"), sizes: "1280x720", type: "image/png" }
+          : { src: withBase("/screenshot-1280x720.png"), sizes: "1280x720", type: "image/png" },
+      ];
+    })(),
     protocol_handlers: [
       { protocol: "mailto", url: withBase("/protocol/mailto?url=%s") },
       { protocol: "webcal", url: withBase("/protocol/webcal?url=%s") },

components/calendar/calendar-sidebar-panel.tsx

@@ -2,7 +2,7 @@
 
 import { useMemo, useState } from "react";
 import { useTranslations } from "next-intl";
-import { ChevronDown, ChevronRight, Globe, ListTodo, Pencil, RefreshCw, Share2, Trash2, Cake, User, Users, Plus, Eraser, Palette } from "lucide-react";
+import { ChevronDown, ChevronRight, Globe, ListTodo, Pencil, RefreshCw, Share2, Trash2, Cake, User, Users, Plus, Eraser, Palette, Shuffle } from "lucide-react";
 import { cn, formatDateTime } from "@/lib/utils";
 import type { Calendar } from "@/lib/jmap/types";
 import { CalendarColorPicker } from "@/components/settings/calendar-management-settings";
@@ -11,6 +11,7 @@ import { useSettingsStore } from "@/stores/settings-store";
 import { useTaskStore } from "@/stores/task-store";
 import { useAccountStore } from "@/stores/account-store";
 import { BIRTHDAY_CALENDAR_ID } from "@/lib/birthday-calendar";
+import { sharedCalendarColorKey } from "@/lib/shared-calendar-colors";
 import { toast } from "@/stores/toast-store";
 import { ContextMenu, ContextMenuItem, ContextMenuSeparator, ContextMenuSubMenu } from "@/components/ui/context-menu";
 import { useContextMenu } from "@/hooks/use-context-menu";
@@ -50,6 +51,7 @@ interface CalendarSidebarPanelProps {
   selectedCalendarIds: string[];
   onToggleVisibility: (id: string) => void;
   onColorChange?: (calendarId: string, color: string) => void;
+  onResetColor?: (calendar: Calendar) => void;
   onShareCalendar?: (calendar: Calendar) => void;
   onCreateEvent?: (calendar: Calendar) => void;
   onClearCalendar?: (calendar: Calendar) => void;
@@ -71,6 +73,7 @@ export function CalendarSidebarPanel({
   selectedCalendarIds,
   onToggleVisibility,
   onColorChange,
+  onResetColor,
   onShareCalendar,
   onCreateEvent,
   onClearCalendar,
@@ -94,6 +97,7 @@ export function CalendarSidebarPanel({
   const refreshICalSubscription = useCalendarStore((s) => s.refreshICalSubscription);
   const removeICalSubscription = useCalendarStore((s) => s.removeICalSubscription);
   const timeFormat = useSettingsStore((s) => s.timeFormat);
+  const sharedCalendarColors = useSettingsStore((s) => s.sharedCalendarColors);
   const enableCalendarTasks = useSettingsStore((s) => s.enableCalendarTasks);
   const tasks = useTaskStore((s) => s.tasks);
   const setViewMode = useCalendarStore((s) => s.setViewMode);
@@ -303,9 +307,11 @@ export function CalendarSidebarPanel({
     const canCreate = onCreateEvent && !isBirthday && cal.myRights?.mayWriteOwn !== false;
     const canShare = onShareCalendar && cal.myRights?.mayShare && !cal.isShared;
     const canChangeColor = !!onColorChange;
+    const hasColorOverride = !!cal.isShared && !!sharedCalendarColors[sharedCalendarColorKey(cal)];
+    const canResetColor = !!onResetColor && hasColorOverride;
     const canClear = onClearCalendar && !isBirthday && cal.myRights?.mayDelete !== false;
     const canDelete = onDeleteCalendar && !isBirthday && !cal.isDefault && !cal.isShared;
-    const showSeparator = (canCreate || canShare || canChangeColor) && (canClear || canDelete);
+    const showSeparator = (canCreate || canShare || canChangeColor || canResetColor) && (canClear || canDelete);
     const color = cal.color || "#3b82f6";
 
     return (
@@ -335,6 +341,13 @@ export function CalendarSidebarPanel({
             </div>
           </ContextMenuSubMenu>
         )}
+        {canResetColor && (
+          <ContextMenuItem
+            icon={Shuffle}
+            label={tMgmt('random_color')}
+            onClick={() => { closeContextMenu(); onResetColor!(cal); }}
+          />
+        )}
         {showSeparator && <ContextMenuSeparator />}
         {canClear && (
           <ContextMenuItem

components/calendar/event-card.tsx

@@ -34,6 +34,11 @@ function sanitizeColor(color: string | null | undefined, fallback = "#3b82f6"):
 }
 
 function getEventColor(event: CalendarEvent, calendar?: Calendar): string {
+  // A local color override on a shared calendar wins over per-event colors,
+  // so the whole shared calendar paints uniformly in the viewer's chosen hue.
+  if (calendar?.colorIsLocalOverride && calendar.color) {
+    return sanitizeColor(calendar.color);
+  }
   return sanitizeColor(event.color, sanitizeColor(calendar?.color));
 }
 
@@ -78,7 +83,11 @@ export function EventCard({ event, calendar, variant, onClick, onMouseEnter, onM
   const calendarName = calendar?.name || "";
   const durationMinutes = parseDuration(event.duration);
   const endTime = getEventEndDate(event);
-  const timeString = `${format(startDate, timeFmt)} – ${format(endTime, timeFmt)}`;
+  const safeFormat = (d: Date, fmt: string) => {
+    if (isNaN(d.getTime())) return "--:--";
+    try { return format(d, fmt); } catch { return "--:--"; }
+  };
+  const timeString = `${safeFormat(startDate, timeFmt)} – ${safeFormat(endTime, timeFmt)}`;
   const ariaLabel = `${event.title || t("events.no_title")}, ${timeString}${calendarName ? `, ${calendarName}` : ""}`;
 
   const handleDragStart = useCallback((e: DragEvent) => {
@@ -153,7 +162,6 @@ export function EventCard({ event, calendar, variant, onClick, onMouseEnter, onM
           "w-full h-full text-left rounded-r px-1.5 py-0.5 text-xs overflow-hidden",
           "hover:opacity-90 transition-opacity cursor-pointer",
           continuesAfter && "rounded-r-sm",
-          continuesBefore && "-ml-0.5",
           continuesAfter && "pr-2",
           isSelected && "ring-2 ring-primary",
           isBeingDragged && "opacity-50",

components/calendar/event-detail-popover.tsx

@@ -8,11 +8,11 @@ import {
   X, Clock, MapPin, Video, Users, Repeat, Bell, AlignLeft,
   Pencil, Trash2, Copy, Send, Check,
 } from "lucide-react";
-import { format, parseISO } from "date-fns";
+import { format, isSameDay, parseISO } from "date-fns";
 import { cn } from "@/lib/utils";
 import type { CalendarEvent, Calendar, CalendarParticipant } from "@/lib/jmap/types";
 import { parseDuration, getEventColor } from "./event-card";
-import { getEventEndDate, getEventStartDate } from "@/lib/calendar-utils";
+import { getEventDisplayEndDate, getEventEndDate, getEventStartDate } from "@/lib/calendar-utils";
 import {
   isOrganizer,
   getUserParticipantId,
@@ -143,6 +143,8 @@ export function EventDetailPopover({
   const startDate = getEventStartDate(event);
   const durationMinutes = parseDuration(event.duration);
   const endDate = getEventEndDate(event);
+  const displayEndDate = getEventDisplayEndDate(event);
+  const isMultiDay = !isSameDay(startDate, displayEndDate);
 
   const locationName = useMemo(() => {
     if (!event.locations) return null;
@@ -331,16 +333,50 @@ export function EventDetailPopover({
         <div className="flex items-start gap-2.5">
           <Clock className="w-4 h-4 text-muted-foreground mt-0.5 flex-shrink-0" />
           <div className="text-sm">
-            <span className="font-medium text-foreground">
+            {isMultiDay ? (
-              {formatEventDate(startDate)}
+              event.showWithoutTime ? (
-            </span>
+                <>
-            {event.showWithoutTime ? (
+                  <div className="font-medium text-foreground">
-              <span className="text-muted-foreground ml-1.5">{t("events.all_day")}</span>
+                    {formatEventDate(startDate)} –
+                  </div>
+                  <div className="font-medium text-foreground">
+                    {formatEventDate(displayEndDate)}
+                  </div>
+                  <div className="text-muted-foreground">{t("events.all_day")}</div>
+                </>
+              ) : (
+                <>
+                  <div className="font-medium text-foreground">
+                    {formatEventDate(startDate)}
+                    <span className="ml-1.5 font-normal text-muted-foreground">
+                      {formatTime(startDate)}
+                    </span>
+                  </div>
+                  <div className="font-medium text-foreground">
+                    {formatEventDate(endDate)}
+                    <span className="ml-1.5 font-normal text-muted-foreground">
+                      {formatTime(endDate)}
+                    </span>
+                  </div>
+                  <div className="text-muted-foreground text-xs">
+                    ({formatDurationDisplay(durationMinutes)})
+                  </div>
+                </>
+              )
             ) : (
-              <div className="text-muted-foreground">
+              <>
-                {formatTime(startDate)} – {formatTime(endDate)}
+                <span className="font-medium text-foreground">
-                <span className="ml-1.5 text-xs">({formatDurationDisplay(durationMinutes)})</span>
+                  {formatEventDate(startDate)}
-              </div>
+                </span>
+                {event.showWithoutTime ? (
+                  <span className="text-muted-foreground ml-1.5">{t("events.all_day")}</span>
+                ) : (
+                  <div className="text-muted-foreground">
+                    {formatTime(startDate)} – {formatTime(endDate)}
+                    <span className="ml-1.5 text-xs">({formatDurationDisplay(durationMinutes)})</span>
+                  </div>
+                )}
+              </>
             )}
           </div>
         </div>

components/calendar/event-modal.tsx

@@ -5,7 +5,7 @@ import { useTranslations } from "next-intl";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { X, Trash2, Check, Users, CalendarDays, Copy, Pencil, Clock, MapPin, Video, Repeat, Bell, AlignLeft, Plus } from "lucide-react";
-import { format, parseISO, addHours, addDays } from "date-fns";
+import { format, parseISO, addHours, addDays, isSameDay } from "date-fns";
 import type { CalendarEvent, Calendar, CalendarParticipant, CalendarEventAlert } from "@/lib/jmap/types";
 import { parseDuration, getEventColor } from "./event-card";
 import { buildAllDayDuration, getEventDisplayEndDate, getEventEndDate, getEventStartDate, getPrimaryCalendarId } from "@/lib/calendar-utils";
@@ -621,14 +621,42 @@ export function EventModal({
               </div>
             </div>
 
-            <div className="text-sm">
+            {(() => {
-              <span className="font-medium">{formatEventDate(startD)}</span>
+              const displayEnd = getEventDisplayEndDate(event);
-              {!event.showWithoutTime && (
+              const multiDay = !isSameDay(startD, displayEnd);
-                <span className="text-muted-foreground ml-2">
+              if (multiDay && event.showWithoutTime) {
-                  {format(startD, timeDisplayFmt)} – {format(endD, timeDisplayFmt)}
+                return (
-                </span>
+                  <div className="text-sm">
-              )}
+                    <div className="font-medium">{formatEventDate(startD)} –</div>
-            </div>
+                    <div className="font-medium">{formatEventDate(displayEnd)}</div>
+                  </div>
+                );
+              }
+              if (multiDay) {
+                return (
+                  <div className="text-sm">
+                    <div>
+                      <span className="font-medium">{formatEventDate(startD)}</span>
+                      <span className="text-muted-foreground ml-2">{format(startD, timeDisplayFmt)}</span>
+                    </div>
+                    <div>
+                      <span className="font-medium">{formatEventDate(endD)}</span>
+                      <span className="text-muted-foreground ml-2">{format(endD, timeDisplayFmt)}</span>
+                    </div>
+                  </div>
+                );
+              }
+              return (
+                <div className="text-sm">
+                  <span className="font-medium">{formatEventDate(startD)}</span>
+                  {!event.showWithoutTime && (
+                    <span className="text-muted-foreground ml-2">
+                      {format(startD, timeDisplayFmt)} – {format(endD, timeDisplayFmt)}
+                    </span>
+                  )}
+                </div>
+              );
+            })()}
 
             {event.description && (
               <p className="text-sm text-muted-foreground">{event.description}</p>
@@ -742,17 +770,55 @@ export function EventModal({
             <div className="flex items-start gap-2.5">
               <Clock className="w-4 h-4 text-muted-foreground mt-0.5 flex-shrink-0" />
               <div className="text-sm">
-                <span className="font-medium text-foreground">
+                {(() => {
-                  {formatEventDate(startD)}
+                  const displayEnd = getEventDisplayEndDate(event);
-                </span>
+                  const multiDay = !isSameDay(startD, displayEnd);
-                {event.showWithoutTime ? (
+                  if (multiDay && event.showWithoutTime) {
-                  <span className="text-muted-foreground ml-1.5">{t("events.all_day")}</span>
+                    return (
-                ) : (
+                      <>
-                  <div className="text-muted-foreground">
+                        <div className="font-medium text-foreground">{formatEventDate(startD)} –</div>
-                    {format(startD, timeDisplayFmt)} – {format(endD, timeDisplayFmt)}
+                        <div className="font-medium text-foreground">{formatEventDate(displayEnd)}</div>
-                    <span className="ml-1.5 text-xs">({formatDurationDisplay(durMin)})</span>
+                        <div className="text-muted-foreground">{t("events.all_day")}</div>
-                  </div>
+                      </>
-                )}
+                    );
+                  }
+                  if (multiDay) {
+                    return (
+                      <>
+                        <div className="font-medium text-foreground">
+                          {formatEventDate(startD)}
+                          <span className="ml-1.5 font-normal text-muted-foreground">
+                            {format(startD, timeDisplayFmt)}
+                          </span>
+                        </div>
+                        <div className="font-medium text-foreground">
+                          {formatEventDate(endD)}
+                          <span className="ml-1.5 font-normal text-muted-foreground">
+                            {format(endD, timeDisplayFmt)}
+                          </span>
+                        </div>
+                        <div className="text-muted-foreground text-xs">
+                          ({formatDurationDisplay(durMin)})
+                        </div>
+                      </>
+                    );
+                  }
+                  return (
+                    <>
+                      <span className="font-medium text-foreground">
+                        {formatEventDate(startD)}
+                      </span>
+                      {event.showWithoutTime ? (
+                        <span className="text-muted-foreground ml-1.5">{t("events.all_day")}</span>
+                      ) : (
+                        <div className="text-muted-foreground">
+                          {format(startD, timeDisplayFmt)} – {format(endD, timeDisplayFmt)}
+                          <span className="ml-1.5 text-xs">({formatDurationDisplay(durMin)})</span>
+                        </div>
+                      )}
+                    </>
+                  );
+                })()}
               </div>
             </div>
 

components/email/email-composer.tsx

@@ -5,11 +5,14 @@ import { useFocusTrap } from "@/hooks/use-focus-trap";
 import { useTranslations } from "next-intl";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
-import { X, Paperclip, Send, Save, Check, Loader2, AlertCircle, FileText, BookmarkPlus, ShieldCheck, Lock } from "lucide-react";
+import { X, Paperclip, Send, Save, Check, Loader2, AlertCircle, FileText, BookmarkPlus, ShieldCheck, Lock, CalendarClock, ChevronDown, MailCheck } from "lucide-react";
 import { cn, formatFileSize, formatDateTime, generateUUID } from "@/lib/utils";
 import { debug } from "@/lib/debug";
 import { toast } from "@/stores/toast-store";
-import { sanitizeSignatureHtml } from "@/lib/email-sanitization";
+import { sanitizeSignatureHtml, sanitizeEmailHtml } from "@/lib/email-sanitization";
+import { buildReplySubject, buildForwardSubject } from "@/lib/subject-prefix";
+import { isFilePreviewable } from "@/lib/file-preview";
+import { buildQuotedHtmlBlock, serializeEditorContent } from "@/components/email/quoted-html";
 import { emailHooks, contactHooks } from "@/lib/plugin-hooks";
 import type { OutgoingEmail, RecipientSuggestion } from "@/lib/plugin-types";
 import { useAuthStore } from "@/stores/auth-store";
@@ -23,6 +26,7 @@ import { buildMimeMessage, wrapCmsAsSmimeMessage } from "@/lib/smime/mime-builde
 import type { MimeAttachment } from "@/lib/smime/mime-builder";
 import { smimeSign } from "@/lib/smime/smime-sign";
 import { PluginSlot } from "@/components/plugins/plugin-slot";
+import { FilePreviewModal } from "@/components/files/file-preview-modal";
 import { smimeEncrypt } from "@/lib/smime/smime-encrypt";
 import { useContactStore } from "@/stores/contact-store";
 import { useTemplateStore } from "@/stores/template-store";
@@ -88,7 +92,10 @@ interface EmailComposerProps {
     attachments?: Array<{ blobId: string; name: string; type: string; size: number; disposition?: 'attachment' | 'inline'; cid?: string }>;
     inReplyTo?: string[];
     references?: string[];
+    delayedUntil?: string;
+    requestReadReceipt?: boolean;
   }) => void | Promise<void>;
+  onScheduledSendCreated?: () => void | Promise<void>;
   onClose?: () => void;
   onDiscardDraft?: (draftId: string) => void;
   onSaveState?: (data: ComposerDraftData) => void;
@@ -168,8 +175,21 @@ function buildEmbeddedSignatureHtml(
   return '';
 }
 
+function formatLocalDateTimeInput(date: Date): string {
+  const pad = (value: number) => String(value).padStart(2, '0');
+  return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())}T${pad(date.getHours())}:${pad(date.getMinutes())}`;
+}
+
+function getDefaultScheduleValue(): string {
+  const tomorrowAtEight = new Date();
+  tomorrowAtEight.setDate(tomorrowAtEight.getDate() + 1);
+  tomorrowAtEight.setHours(8, 0, 0, 0);
+  return formatLocalDateTimeInput(tomorrowAtEight);
+}
+
 export function EmailComposer({
   onSend,
+  onScheduledSendCreated,
   onClose,
   onDiscardDraft,
   onSaveState,
@@ -181,14 +201,17 @@ export function EmailComposer({
 }: EmailComposerProps) {
   const t = useTranslations('email_composer');
   const tCommon = useTranslations('common');
+  const tQuote = useTranslations('quote_header');
   const timeFormat = useSettingsStore((state) => state.timeFormat);
   const plainTextMode = useSettingsStore((state) => state.plainTextMode);
   const subAddressDelimiter = useSettingsStore((state) => state.subAddressDelimiter);
   const autoSelectReplyIdentity = useSettingsStore((state) => state.autoSelectReplyIdentity);
   const attachmentReminderEnabled = useSettingsStore((state) => state.attachmentReminderEnabled);
   const attachmentReminderKeywords = useSettingsStore((state) => state.attachmentReminderKeywords);
+  const sendDelaySeconds = useSettingsStore((state) => state.sendDelaySeconds);
   const signaturePosition = useSettingsStore((state) => state.signaturePosition);
   const signatureSeparatorEnabled = useSettingsStore((state) => state.signatureSeparatorEnabled);
+  const requestReadReceiptDefault = useSettingsStore((state) => state.requestReadReceiptDefault);
   const activeIdentities = useIdentityStore((s) => s.identities);
   // Pro shell: surface identities from every connected account, grouped
   // for the From dropdown's <optgroup>s. Outside Pro this collapses to
@@ -212,10 +235,16 @@ export function EmailComposer({
   const initialSignatureIdentity = (initialCurrentIdentityForSig?.htmlSignature || initialCurrentIdentityForSig?.textSignature)
     ? initialCurrentIdentityForSig
     : primaryIdentity;
+  const hasInitialSignature = !!(initialSignatureIdentity?.htmlSignature || initialSignatureIdentity?.textSignature);
   const shouldEmbedSignatureAboveQuote =
     (mode === 'reply' || mode === 'replyAll' || mode === 'forward') &&
     signaturePosition === 'above_quote' &&
-    !!(initialSignatureIdentity?.htmlSignature || initialSignatureIdentity?.textSignature);
+    hasInitialSignature;
+  // New-mail composes always embed the signature into the editor body so it's
+  // editable/removable (the previous read-only preview below the editor was
+  // never spec-correct - see #329). Compose mode also ignores any leftover
+  // `replyTo` from a still-selected email; getInitialBody short-circuits below.
+  const shouldEmbedSignatureInNewMail = mode === 'compose' && hasInitialSignature;
 
   // Initialize with reply/forward data if provided
   const getInitialTo = () => {
@@ -243,11 +272,9 @@ export function EmailComposer({
   const getInitialSubject = () => {
     if (!replyTo?.subject) return "";
     if (mode === 'forward') {
-      const fwdPrefix = t('prefix.forward');
+      return buildForwardSubject(replyTo.subject, t('prefix.forward'));
-      return `${fwdPrefix} ${replyTo.subject.replace(/^(Fwd:\s*|Tr:\s*)+/i, '')}`;
     } else if (mode === 'reply' || mode === 'replyAll') {
-      const rePrefix = t('prefix.reply');
+      return buildReplySubject(replyTo.subject, t('prefix.reply'));
-      return `${rePrefix} ${replyTo.subject.replace(/^(Re:\s*)+/i, '')}`;
     }
     return "";
   };
@@ -256,11 +283,26 @@ export function EmailComposer({
     if (plainTextMode) {
       // Plain text mode: produce plain text body with no HTML
       const prefix = initialDraftText || "";
+      // Compose mode: ignore any leftover replyTo (e.g. a selected mail in the
+      // viewer) and embed the signature directly into the body so it's
+      // editable. Fixes #329 (A,B).
+      if (mode === 'compose') {
+        if (!shouldEmbedSignatureInNewMail) return prefix;
+        const sep = signatureSeparatorEnabled ? '\n\n-- \n' : '\n\n';
+        return `${prefix}${sep}${getPlainTextSignature(initialSignatureIdentity)}`;
+      }
       if (!replyTo?.body && !replyTo?.htmlBody) return prefix;
 
       const date = replyTo.receivedAt ? formatDateTime(replyTo.receivedAt, timeFormat, { weekday: 'short', year: 'numeric', month: 'short', day: 'numeric' }) : "";
       const from = replyTo.from?.[0];
       const fromStr = from ? `${from.name || from.email}` : tCommon('unknown');
+      // Forward "From:" shows the full sender incl. address; reply line keeps
+      // the bare name (reads naturally in the localized "On … wrote:" line).
+      const fromStrFull = from
+        ? (from.name && from.email && from.name !== from.email
+            ? `${from.name} <${from.email}>`
+            : (from.email || from.name || tCommon('unknown')))
+        : tCommon('unknown');
 
       const originalText = replyTo.body || (replyTo.htmlBody ? htmlToPlainText(replyTo.htmlBody) : '');
       const quotedText = originalText.split('\n').map(line => `> ${line}`).join('\n');
@@ -281,19 +323,36 @@ export function EmailComposer({
       }
 
       if (mode === 'forward') {
-        return `${prefix}${signatureBlock}\n\n---------- Forwarded message ----------\nFrom: ${fromStr}\nDate: ${date}\nSubject: ${replyTo.subject || ''}\n\n${originalText}`;
+        return `${prefix}${signatureBlock}\n\n${tQuote('forwarded_separator')}\n${tQuote('from_label')}: ${fromStrFull}\n${tQuote('date_label')}: ${date}\n${tQuote('subject_label')}: ${replyTo.subject || ''}\n\n${originalText}`;
       } else if (mode === 'reply' || mode === 'replyAll') {
-        return `${prefix}${signatureBlock}\n\nOn ${date}, ${fromStr} wrote:\n${quotedText}`;
+        return `${prefix}${signatureBlock}\n\n${tQuote('reply_line', { date, from: fromStr })}\n${quotedText}`;
       }
       return prefix;
     }
 
     const prefix = initialDraftText ? `<p>${initialDraftText.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/\n/g, '<br>')}</p>` : "";
+    // Compose mode: ignore any leftover replyTo and embed the signature
+    // directly into the body so the user can edit/delete it. The leading
+    // empty paragraph gives the cursor a place to land above the signature.
+    if (mode === 'compose') {
+      if (!shouldEmbedSignatureInNewMail) return prefix;
+      const composePrefix = prefix || '<p></p>';
+      const embedded = buildEmbeddedSignatureHtml(initialSignatureIdentity, {
+        embed: true,
+        separator: signatureSeparatorEnabled,
+      });
+      return `${composePrefix}${embedded}`;
+    }
     if (!replyTo?.body && !replyTo?.htmlBody) return prefix;
 
     const date = replyTo.receivedAt ? formatDateTime(replyTo.receivedAt, timeFormat, { weekday: 'short', year: 'numeric', month: 'short', day: 'numeric' }) : "";
     const from = replyTo.from?.[0];
     const fromStr = from ? `${from.name || from.email}` : tCommon('unknown');
+    const fromStrFull = from
+      ? (from.name && from.email && from.name !== from.email
+          ? `${from.name} <${from.email}>`
+          : (from.email || from.name || tCommon('unknown')))
+      : tCommon('unknown');
 
     const signatureBlock = buildEmbeddedSignatureHtml(initialSignatureIdentity, {
       embed: shouldEmbedSignatureAboveQuote,
@@ -302,35 +361,46 @@ export function EmailComposer({
 
     // Plugin override (resolved at composer open via onBuildQuoteHeader).
     if (replyTo.quoteHeaderHtml !== undefined && (mode === 'reply' || mode === 'replyAll' || mode === 'forward')) {
+      if (replyTo.htmlBody) {
+        // Layout-heavy original: embed verbatim as a QuotedHtml island so
+        // nested tables / MJML survive 1:1 (sanitize strips scripts/styles
+        // first; cid rewrite runs after so its data-cid markers survive).
+        const island = buildQuotedHtmlBlock(
+          rewriteCidImagesForEditor(sanitizeEmailHtml(replyTo.htmlBody))
+        );
+        return `${prefix}${signatureBlock}<br>${replyTo.quoteHeaderHtml}${island}`;
+      }
+      const escaped = replyTo.body
+        ? replyTo.body.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/\n/g, '<br>')
+        : '';
       const wrap = replyTo.quoteWrapInBlockquote !== false;
-      const originalHtml = replyTo.htmlBody
-        ? rewriteCidImagesForEditor(replyTo.htmlBody)
-        : (replyTo.body
-          ? replyTo.body.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/\n/g, '<br>')
-          : '');
       const bodyHtml = wrap
-        ? `<blockquote style="margin:0 0 0 0.8ex;border-left:2px solid #ccc;padding-left:1ex">${originalHtml}</blockquote>`
+        ? `<blockquote style="margin:0 0 0 0.8ex;border-left:2px solid #ccc;padding-left:1ex">${escaped}</blockquote>`
-        : originalHtml;
+        : escaped;
       return `${prefix}${signatureBlock}<br>${replyTo.quoteHeaderHtml}${bodyHtml}`;
     }
 
     // Build quoted content as HTML
     if (replyTo.htmlBody && (mode === 'reply' || mode === 'replyAll' || mode === 'forward')) {
       const quoteHeader = mode === 'forward'
-        ? `---------- Forwarded message ----------<br>From: ${fromStr}<br>Date: ${date}<br>Subject: ${replyTo.subject || ''}<br><br>`
+        ? `${tQuote('forwarded_separator')}<br>${tQuote('from_label')}: ${fromStrFull}<br>${tQuote('date_label')}: ${date}<br>${tQuote('subject_label')}: ${replyTo.subject || ''}<br><br>`
-        : `On ${date}, ${fromStr} wrote:<br>`;
+        : `${tQuote('reply_line', { date, from: fromStr })}<br>`;
-      // cid: image refs are rewritten so they render in the editor (browsers
+      // Embed the original as a QuotedHtml island (verbatim, schema-free) so
-      // can't fetch cid: URLs); see useEffect below for the data-URL backfill.
+      // its layout survives the editor round-trip. Sanitize first to strip
-      const quotedHtml = rewriteCidImagesForEditor(replyTo.htmlBody);
+      // scripts/styles/head; cid rewrite afterwards so data-cid markers
-      return `${prefix}${signatureBlock}<br><div>${quoteHeader}</div><blockquote style="margin:0 0 0 0.8ex;border-left:2px solid #ccc;padding-left:1ex">${quotedHtml}</blockquote>`;
+      // aren't dropped by the sanitizer's ALLOW_DATA_ATTR:false.
+      const island = buildQuotedHtmlBlock(
+        rewriteCidImagesForEditor(sanitizeEmailHtml(replyTo.htmlBody))
+      );
+      return `${prefix}${signatureBlock}<br><div>${quoteHeader}</div>${island}`;
     }
 
     if (replyTo.body) {
       const escapedOriginal = replyTo.body.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/\n/g, '<br>');
       if (mode === 'forward') {
-        return `${prefix}${signatureBlock}<br><br>---------- Forwarded message ----------<br>From: ${fromStr}<br>Date: ${date}<br>Subject: ${replyTo.subject || ''}<br><br>${escapedOriginal}`;
+        return `${prefix}${signatureBlock}<br><br>${tQuote('forwarded_separator')}<br>${tQuote('from_label')}: ${fromStrFull}<br>${tQuote('date_label')}: ${date}<br>${tQuote('subject_label')}: ${replyTo.subject || ''}<br><br>${escapedOriginal}`;
       } else if (mode === 'reply' || mode === 'replyAll') {
-        return `${prefix}${signatureBlock}<br><br>On ${date}, ${fromStr} wrote:<br><blockquote style="margin:0 0 0 0.8ex;border-left:2px solid #ccc;padding-left:1ex">${escapedOriginal}</blockquote>`;
+        return `${prefix}${signatureBlock}<br><br>${tQuote('reply_line', { date, from: fromStr })}<br><blockquote style="margin:0 0 0 0.8ex;border-left:2px solid #ccc;padding-left:1ex">${escapedOriginal}</blockquote>`;
       }
     }
     return prefix;
@@ -343,6 +413,7 @@ export function EmailComposer({
   const [body, setBody] = useState(initialData?.body ?? getInitialBody());
   const [showCc, setShowCc] = useState(initialData?.showCc ?? !!getInitialCc());
   const [showBcc, setShowBcc] = useState(initialData?.showBcc ?? false);
+  const [requestReadReceipt, setRequestReadReceipt] = useState(requestReadReceiptDefault);
   const [draftId, setDraftId] = useState<string | null>(initialData?.draftId ?? null);
   // Mirror of draftId for synchronous reads inside chained saves; React's
   // setDraftId is async, so a queued saveDraft would otherwise see the old
@@ -383,6 +454,7 @@ export function EmailComposer({
   const [showSaveAsTemplate, setShowSaveAsTemplate] = useState(false);
   const [showCloseDialog, setShowCloseDialog] = useState(false);
   const [showAllAttachments, setShowAllAttachments] = useState(false);
+  const [previewAttachment, setPreviewAttachment] = useState<ComposerAttachment | null>(null);
   const [smimeSign_, setSmimeSign] = useState(false);
   const [smimeEncrypt_, setSmimeEncrypt] = useState(false);
   const [smimePassphrasePrompt, setSmimePassphrasePrompt] = useState<{ keyId: string; resolve: (passphrase: string) => void; reject: () => void } | null>(null);
@@ -390,6 +462,12 @@ export function EmailComposer({
   const [smimePassphraseError, setSmimePassphraseError] = useState('');
   const [showAttachmentWarning, setShowAttachmentWarning] = useState(false);
   const [attachmentWarningKeyword, setAttachmentWarningKeyword] = useState('');
+  const [attachmentWarningDelayedUntil, setAttachmentWarningDelayedUntil] = useState<string | undefined>();
+  const [showScheduleDialog, setShowScheduleDialog] = useState(false);
+  const [scheduleValue, setScheduleValue] = useState('');
+  const [scheduleError, setScheduleError] = useState('');
+  const [showSendMenu, setShowSendMenu] = useState(false);
+  const sendMenuRef = useRef<HTMLDivElement>(null);
 
   const saveTemplateModalRef = useFocusTrap({
     isActive: showSaveAsTemplate,
@@ -449,10 +527,15 @@ export function EmailComposer({
     if (!editor) return;
     if (!identityChanged && !separatorChanged) return;
     if (plainTextMode) return;
-    if (mode !== 'reply' && mode !== 'replyAll' && mode !== 'forward') return;
+    // Replies/forwards only embed when configured for "above quote". Compose
-    if (signaturePosition !== 'above_quote') return;
+    // always embeds (see getInitialBody), so swap on identity change there too.
+    const isReplyLike = mode === 'reply' || mode === 'replyAll' || mode === 'forward';
+    if (!isReplyLike && mode !== 'compose') return;
+    if (isReplyLike && signaturePosition !== 'above_quote') return;
 
-    const currentHtml = editor.getHTML();
+    // serializeEditorContent (not getHTML) so a QuotedHtml island's verbatim
+    // body isn't lost during the signature splice + setContent round-trip.
+    const currentHtml = serializeEditorContent(editor);
     const doc = new DOMParser().parseFromString(currentHtml, 'text/html');
     const startEl = doc.querySelector('[data-signature-block="separator"], [data-signature-block="start"]');
     if (!startEl) return;
@@ -474,15 +557,23 @@ export function EmailComposer({
     if (!parent) return;
 
     // Remove the existing signature range [startEl … endEl] inclusive, or
-    // from startEl to the next blockquote if no end marker is present.
+    // from startEl to the next quote boundary if no end marker is present.
+    // The quote boundary is either a legacy <blockquote> or the QuotedHtml
+    // island wrapper (<div data-quoted-html>) - stop before either so the
+    // signature splice never eats into the quoted body.
     const removeUntil = endEl && endEl.parentNode === parent ? endEl : null;
+    const isQuoteBoundary = (n: Node | null): boolean => {
+      if (!n || n.nodeType !== 1) return false;
+      const el = n as Element;
+      return el.tagName === 'BLOCKQUOTE' || el.hasAttribute('data-quoted-html');
+    };
     const toRemove: Node[] = [];
     let cursor: Node | null = startEl;
     while (cursor) {
       toRemove.push(cursor);
       if (cursor === removeUntil) break;
       const next: Node | null = cursor.nextSibling;
-      if (!removeUntil && next && (next as Element).tagName === 'BLOCKQUOTE') break;
+      if (!removeUntil && isQuoteBoundary(next)) break;
       cursor = next;
     }
     const insertBefore = toRemove[toRemove.length - 1]?.nextSibling ?? null;
@@ -495,6 +586,23 @@ export function EmailComposer({
     }
   }, [signatureIdentity?.id, signatureIdentity?.htmlSignature, signatureIdentity?.textSignature, signatureSeparatorEnabled, signaturePosition, mode, plainTextMode]);
 
+  useEffect(() => {
+    const handleClickOutsideSendMenu = (event: MouseEvent) => {
+      if (!sendMenuRef.current?.contains(event.target as Node)) {
+        setShowSendMenu(false);
+      }
+    };
+    document.addEventListener('mousedown', handleClickOutsideSendMenu);
+    return () => document.removeEventListener('mousedown', handleClickOutsideSendMenu);
+  }, []);
+
+  const openScheduleDialog = useCallback(() => {
+    setScheduleError('');
+    setScheduleValue(getDefaultScheduleValue());
+    setShowScheduleDialog(true);
+    setShowSendMenu(false);
+  }, []);
+
   useEffect(() => {
     if (!autoSelectReplyIdentity) return;
     if (selectedIdentityId || initialData?.selectedIdentityId) return;
@@ -664,9 +772,16 @@ export function EmailComposer({
   // Ref to latest saveDraft for use in event handlers with stale closures
   const saveDraftRef = useRef<() => Promise<string | null>>(() => Promise.resolve(null));
 
+  // Set by the explicit close paths (clean close, save-and-close, discard) so
+  // the unmount auto-save below doesn't fire and stash a stale pendingDraft
+  // on the parent (#329 D). Without this, "Reply → Discard → New mail" would
+  // open the next composer with the discarded reply's mode/replyTo.
+  const explicitCloseRef = useRef(false);
+
   // Auto-save state on unmount (when user navigates away without explicitly closing)
   useEffect(() => {
     return () => {
+      if (explicitCloseRef.current) return;
       if (onSaveState && isDirtyRef.current) {
         const s = stateRef.current;
         onSaveState({
@@ -1011,6 +1126,43 @@ export function EmailComposer({
     setAttachments(prev => prev.filter((_, i) => i !== index));
   };
 
+  // Inline preview for composer attachments, reusing the message viewer's
+  // FilePreviewModal (so previewability and the open-in-new-tab safety gate are
+  // handled there). Prefer the local File - no network - and fall back to the
+  // uploaded blob (forwarded attachments, which carry only a blobId).
+  const getPreviewAttachmentContent = useCallback(async () => {
+    if (!previewAttachment) throw new Error('No attachment selected');
+    if (previewAttachment.file) {
+      return {
+        blob: previewAttachment.file,
+        contentType: previewAttachment.type || previewAttachment.file.type || 'application/octet-stream',
+      };
+    }
+    if (composerClient && previewAttachment.blobId) {
+      const blob = await composerClient.fetchBlob(previewAttachment.blobId, previewAttachment.name, previewAttachment.type);
+      return { blob, contentType: previewAttachment.type || blob.type || 'application/octet-stream' };
+    }
+    throw new Error('No attachment content available');
+  }, [previewAttachment, composerClient]);
+
+  const handlePreviewAttachmentDownload = useCallback(async () => {
+    if (!previewAttachment) return;
+    if (previewAttachment.file) {
+      const url = URL.createObjectURL(previewAttachment.file);
+      const a = document.createElement('a');
+      a.href = url;
+      a.download = previewAttachment.name;
+      document.body.appendChild(a);
+      a.click();
+      document.body.removeChild(a);
+      URL.revokeObjectURL(url);
+      return;
+    }
+    if (composerClient && previewAttachment.blobId) {
+      await composerClient.downloadBlob(previewAttachment.blobId, previewAttachment.name, previewAttachment.type);
+    }
+  }, [previewAttachment, composerClient]);
+
   // Auto-save draft functionality
   const saveDraftOnce = async (): Promise<string | null> => {
     if (!client || !composerClient) return null;
@@ -1184,6 +1336,33 @@ export function EmailComposer({
     return undefined;
   };
 
+  const validateScheduleValue = (value: string): string | null => {
+    if (!value) return t('schedule_send_required');
+    const time = new Date(value).getTime();
+    if (!Number.isFinite(time)) return t('schedule_send_invalid');
+    if (time <= Date.now()) return t('schedule_send_future');
+    if (composerClient) {
+      const maxDelayedSend = composerClient.getMaxDelayedSend();
+      if (maxDelayedSend > 0 && time > Date.now() + maxDelayedSend * 1000) {
+        return t('schedule_send_too_late');
+      }
+    }
+    return null;
+  };
+
+  const resolveDelayedUntil = async (requestedDelayedUntil?: string): Promise<string | undefined> => {
+    if (requestedDelayedUntil) return requestedDelayedUntil;
+    if (sendDelaySeconds === 0) return undefined;
+    if (composerClient?.hasDelayedSend()) {
+      return new Date(Date.now() + sendDelaySeconds * 1000).toISOString();
+    }
+    const confirmed = window.confirm(t('send_delay_unsupported_confirm'));
+    if (!confirmed) {
+      throw new Error(t('send_delay_unsupported'));
+    }
+    return undefined;
+  };
+
   // Rewrite data: URLs of dropped images (tagged with data-cid) into cid:
   // references so recipient clients that strip data URIs can still render them.
   const rewriteInlineImages = (html: string): {
@@ -1227,7 +1406,7 @@ export function EmailComposer({
     };
   };
 
-  const handleSend = async (skipAttachmentCheck = false) => {
+  const handleSend = async (skipAttachmentCheck = false, delayedUntil?: string) => {
     const ccAddresses = cc.split(",").map(e => e.trim()).filter(Boolean);
     const bccAddresses = bcc.split(",").map(e => e.trim()).filter(Boolean);
 
@@ -1255,6 +1434,7 @@ export function EmailComposer({
         const matched = attachmentReminderKeywords.find(kw => searchText.includes(kw.toLowerCase()));
         if (matched) {
           setAttachmentWarningKeyword(matched);
+          setAttachmentWarningDelayedUntil(delayedUntil);
           setShowAttachmentWarning(true);
           return;
         }
@@ -1305,12 +1485,14 @@ export function EmailComposer({
     const envelopeMailFrom = overrideActive ? identityFromEmail : undefined;
 
     // Body is already HTML from the rich text editor (or plain text in plain text mode).
-    // When "above quote" mode is configured for replies/forwards, the signature
+    // The signature is embedded into the body during init for compose mode
-    // was embedded into the body during init (see getInitialBody) so the
+    // (when the initial identity had a signature) and for above-quote
-    // trailing append must be skipped to avoid duplicating it.
+    // replies/forwards - skip the trailing append in those cases so we don't
+    // duplicate it.
     const signatureAlreadyInBody =
-      (mode === 'reply' || mode === 'replyAll' || mode === 'forward') &&
+      shouldEmbedSignatureInNewMail ||
-      signaturePosition === 'above_quote';
+      ((mode === 'reply' || mode === 'replyAll' || mode === 'forward') &&
+        signaturePosition === 'above_quote');
 
     // Build HTML signature block (used only in rich text mode)
     const buildSignatureHtml = (): string => {
@@ -1343,6 +1525,7 @@ export function EmailComposer({
     const inlineAttachments = rewritten?.attachments ?? [];
 
     try {
+      const effectiveDelayedUntil = await resolveDelayedUntil(delayedUntil);
       // Let plugins veto the send (external-mail warning, mistyped-domain
       // guards, etc.). Returning false from any handler aborts before either
       // the S/MIME or standard JMAP path runs.
@@ -1492,7 +1675,16 @@ export function EmailComposer({
         }
 
         // 7. Send via raw email path
-        await sendRawEmail(client, payload, currentIdentity.id);
+        const result = await sendRawEmail(client, payload, currentIdentity.id, effectiveDelayedUntil, [...toAddresses, ...ccAddresses, ...bccAddresses]);
+        if (effectiveDelayedUntil && finalDraftId) {
+          client.deleteEmail(finalDraftId).catch(err => {
+            debug.warn('email', 'Scheduled S/MIME send created, but plaintext draft cleanup failed:', err);
+            toast.warning(t('schedule_send_cleanup_warning'));
+          });
+        }
+        if (result.scheduled) {
+          await onScheduledSendCreated?.();
+        }
       } else {
         // Standard JMAP send path
         // Collect uploaded attachment blobIds for the send request
@@ -1542,6 +1734,8 @@ export function EmailComposer({
           attachments: uploadedAttachments.length > 0 ? uploadedAttachments : undefined,
           inReplyTo: threadingHeaders?.inReplyTo,
           references: threadingHeaders?.references,
+          requestReadReceipt,
+          delayedUntil: effectiveDelayedUntil,
         });
 
         if (mode === 'reply' || mode === 'replyAll') {
@@ -1566,15 +1760,56 @@ export function EmailComposer({
       setDraftId(null);
       setSubAddressTag("");
       setValidationErrors({});
+      setShowScheduleDialog(false);
+      setScheduleValue('');
+      setScheduleError('');
       // Clear ref so unmount effect doesn't re-save
       stateRef.current = { to: '', cc: '', bcc: '', subject: '', body: '', showCc: false, showBcc: false, selectedIdentityId: null, subAddressTag: '', draftId: null, fromOverrideEnabled: false, fromOverrideEmail: '', fromOverrideName: '' };
     } catch (err) {
       debug.error('Failed to send email:', err);
-      toast.error(t('send_failed'));
+      toast.error(err instanceof Error ? err.message : t('send_failed'));
     }
   };
 
+  const handleScheduleSend = () => {
+    if (!composerClient?.hasDelayedSend()) {
+      setScheduleError(t('schedule_send_unsupported'));
+      return;
+    }
+    const error = validateScheduleValue(scheduleValue);
+    if (error) {
+      setScheduleError(error);
+      return;
+    }
+    handleSend(false, new Date(scheduleValue).toISOString());
+  };
+
+  // Ctrl+Enter (Win/Linux) / Cmd+Enter (macOS) sends the open compose
+  // draft. Scoped to events whose target lives inside this composer's
+  // DOM tree — in Pro mode multiple composer tabs can be mounted at
+  // once (inactive tabs are CSS-hidden, not unmounted), so a window
+  // listener would otherwise fire every mounted composer's handleSend
+  // on a single keystroke. handleSend is rebound every render, so we
+  // route through a ref to keep the listener stable.
+  const composerRootRef = useRef<HTMLDivElement | null>(null);
+  const handleSendRef = useRef<((skipAttachmentCheck?: boolean) => Promise<void>) | undefined>(undefined);
+  handleSendRef.current = handleSend;
+  useEffect(() => {
+    const handleSendShortcut = (e: KeyboardEvent) => {
+      if (e.key !== 'Enter') return;
+      if (!(e.ctrlKey || e.metaKey)) return;
+      if (e.altKey || e.shiftKey) return;
+      const root = composerRootRef.current;
+      if (!root || !(e.target instanceof Node) || !root.contains(e.target)) return;
+      e.preventDefault();
+      void handleSendRef.current?.();
+    };
+    window.addEventListener('keydown', handleSendShortcut);
+    return () => window.removeEventListener('keydown', handleSendShortcut);
+  }, []);
+
   const cleanClose = () => {
+    explicitCloseRef.current = true;
     if (saveTimeoutRef.current) {
       clearTimeout(saveTimeoutRef.current);
     }
@@ -1583,6 +1818,7 @@ export function EmailComposer({
   };
 
   const handleSaveDraftAndClose = async () => {
+    explicitCloseRef.current = true;
     setShowCloseDialog(false);
     if (saveTimeoutRef.current) {
       clearTimeout(saveTimeoutRef.current);
@@ -1593,6 +1829,7 @@ export function EmailComposer({
   };
 
   const handleDiscardAndClose = () => {
+    explicitCloseRef.current = true;
     setShowCloseDialog(false);
     if (saveTimeoutRef.current) {
       clearTimeout(saveTimeoutRef.current);
@@ -1612,8 +1849,50 @@ export function EmailComposer({
     }
   };
 
+  const handleComposerKeyDown = (e: React.KeyboardEvent<HTMLDivElement>) => {
+    if (e.defaultPrevented) return;
+
+    const isPlainEscape = e.key === 'Escape' && !e.ctrlKey && !e.metaKey && !e.altKey && !e.shiftKey;
+    const hasPrimaryModifier = e.ctrlKey || e.metaKey;
+    const isSendShortcut = e.key === 'Enter' && hasPrimaryModifier && !e.altKey && !e.shiftKey;
+    const isScheduleShortcut = e.key === 'Enter' && hasPrimaryModifier && !e.altKey && e.shiftKey;
+    if (!isPlainEscape && !isSendShortcut && !isScheduleShortcut) return;
+
+    if (
+      showTemplatePicker ||
+      showSaveAsTemplate ||
+      showScheduleDialog ||
+      smimePassphrasePrompt ||
+      showAttachmentWarning ||
+      showCloseDialog
+    ) return;
+
+    if (isPlainEscape) {
+      if (activeAutoField) return;
+      e.preventDefault();
+      handleClose();
+      return;
+    }
+
+    if (isSendShortcut) {
+      if (e.repeat) {
+        e.preventDefault();
+        return;
+      }
+
+      e.preventDefault();
+      handleSend();
+      return;
+    }
+
+    if (isScheduleShortcut) {
+      e.preventDefault();
+      if (!e.repeat && composerClient?.hasDelayedSend()) openScheduleDialog();
+    }
+  };
+
   return (
-    <div className={cn("flex h-full bg-background", className)}>
+    <div ref={composerRootRef} className={cn("flex h-full bg-background", className)}>
       <PluginSlot
         name="composer-sidebar"
         className="hidden md:flex shrink-0 h-full overflow-hidden border-r border-border"
@@ -1626,6 +1905,7 @@ export function EmailComposer({
       onDragLeave={handleDragLeave}
       onDragOver={handleDragOver}
       onDrop={handleDrop}
+      onKeyDown={handleComposerKeyDown}
     >
       {/* Drag overlay */}
       {isDraggingOver && (
@@ -1946,8 +2226,9 @@ export function EmailComposer({
         )}
 
         {/* Hide the visual signature preview when the signature has already been
-            embedded into the body above the quote (otherwise it would appear twice). */}
+            embedded into the body (compose, or above-quote replies). */}
-        {((mode === 'reply' || mode === 'replyAll' || mode === 'forward') && signaturePosition === 'above_quote') ? null
+        {(shouldEmbedSignatureInNewMail
+          || ((mode === 'reply' || mode === 'replyAll' || mode === 'forward') && signaturePosition === 'above_quote')) ? null
           : plainTextMode ? (
           getPlainTextSignature(signatureIdentity) ? (
             <div className="px-4 pb-3 text-sm leading-6 text-muted-foreground break-words whitespace-pre-wrap font-mono">
@@ -1966,7 +2247,21 @@ export function EmailComposer({
         {attachments.length > 0 && (
           <div className="px-4 py-2 border-t shrink-0">
             <div className="flex flex-wrap gap-2">
-              {(showAllAttachments ? attachments : attachments.slice(0, 3)).map((att, index) => (
+              {(showAllAttachments ? attachments : attachments.slice(0, 3)).map((att, index) => {
+                // Clickable to preview only once it has content (local File or an
+                // uploaded blob) and the type is previewable; never mid-upload.
+                const canPreview = !att.uploading && !att.error
+                  && (!!att.file || !!att.blobId)
+                  && isFilePreviewable(att.name, att.type);
+                const label = (
+                  <>
+                    <span className="max-w-[150px] md:max-w-[200px] truncate">{att.name}</span>
+                    <span className="text-xs text-muted-foreground whitespace-nowrap">
+                      ({formatFileSize(att.size)})
+                    </span>
+                  </>
+                );
+                return (
                 <div
                   key={index}
                   className={cn(
@@ -1988,10 +2283,18 @@ export function EmailComposer({
                     ) : (
                       <Paperclip className="w-3 h-3 flex-shrink-0" />
                     )}
-                    <span className="max-w-[150px] md:max-w-[200px] truncate">{att.name}</span>
+                    {canPreview ? (
-                    <span className="text-xs text-muted-foreground whitespace-nowrap">
+                      <button
-                      ({formatFileSize(att.size)})
+                        type="button"
-                    </span>
+                        onClick={() => setPreviewAttachment(att)}
+                        title={att.name}
+                        className="flex items-center gap-2 min-w-0 hover:underline"
+                      >
+                        {label}
+                      </button>
+                    ) : (
+                      <div className="flex items-center gap-2 min-w-0">{label}</div>
+                    )}
                     <button
                       onClick={() => removeAttachment(index)}
                       className="ml-1 hover:text-red-500 min-w-[20px] min-h-[20px] flex items-center justify-center"
@@ -2001,7 +2304,8 @@ export function EmailComposer({
                     </button>
                   </div>
                 </div>
-              ))}
+                );
+              })}
               {attachments.length > 3 && (
                 <button
                   onClick={() => setShowAllAttachments(prev => !prev)}
@@ -2015,7 +2319,7 @@ export function EmailComposer({
         )}
 
         {/* Bottom toolbar */}
-        <div className="flex items-center justify-between px-4 py-2.5 border-t bg-background shrink-0 pb-[calc(env(safe-area-inset-bottom)/2)]">
+        <div className="flex items-center justify-between px-4 py-2.5 border-t bg-background shrink-0 pb-[calc(0.625rem+env(safe-area-inset-bottom)/2)]">
           {/* Left side actions */}
           <div className="flex items-center gap-1">
             <input
@@ -2053,7 +2357,6 @@ export function EmailComposer({
             >
               <BookmarkPlus className="w-4 h-4" />
             </Button>
-
             {/* S/MIME toggles */}
             {canSmimeSign && (
               <>
@@ -2079,6 +2382,21 @@ export function EmailComposer({
                 </Button>
               </>
             )}
+
+            {/* Read-receipt request toggle */}
+            <Button
+              variant="ghost"
+              size="icon"
+              onClick={() => setRequestReadReceipt(v => !v)}
+              className={cn(
+                "h-9 w-9",
+                requestReadReceipt && "bg-green-600 text-white hover:bg-green-600 hover:text-white dark:bg-green-600 dark:hover:bg-green-600"
+              )}
+              title={requestReadReceipt ? t('read_receipt_on') : t('read_receipt_off')}
+              aria-pressed={requestReadReceipt}
+            >
+              <MailCheck className="w-4 h-4" />
+            </Button>
             <PluginSlot name="composer-toolbar" />
           </div>
 
@@ -2091,15 +2409,56 @@ export function EmailComposer({
             >
               {t('discard')}
             </button>
-            <Button
+            {composerClient?.hasDelayedSend() ? (
-              onClick={() => handleSend()}
+              <div ref={sendMenuRef} className="relative hidden md:inline-flex">
-              disabled={!canSend}
+                <Button
-              title={getSendTooltip()}
+                  onClick={() => handleSend()}
-              className="hidden md:inline-flex"
+                  disabled={!canSend}
-            >
+                  title={getSendTooltip()}
-              <Send className="w-4 h-4 mr-2" />
+                  className="rounded-r-none border-r border-primary-foreground/20"
-              {t('send')}
+                >
-            </Button>
+                  <Send className="w-4 h-4 mr-2" />
+                  {t('send')}
+                </Button>
+                <Button
+                  type="button"
+                  onClick={() => setShowSendMenu((open) => !open)}
+                  disabled={!canSend}
+                  title={t('schedule_send')}
+                  className="rounded-l-none px-2"
+                  aria-haspopup="menu"
+                  aria-expanded={showSendMenu}
+                >
+                  <ChevronDown className="w-4 h-4" />
+                </Button>
+                {showSendMenu && (
+                  <div
+                    role="menu"
+                    className="absolute right-0 bottom-full z-50 mb-2 min-w-44 rounded-md border border-border bg-popover p-1 text-popover-foreground shadow-lg"
+                  >
+                    <button
+                      type="button"
+                      role="menuitem"
+                      onClick={openScheduleDialog}
+                      className="flex w-full items-center gap-2 rounded-sm px-3 py-2 text-left text-sm hover:bg-accent hover:text-accent-foreground"
+                    >
+                      <CalendarClock className="w-4 h-4" />
+                      {t('schedule_send')}
+                    </button>
+                  </div>
+                )}
+              </div>
+            ) : (
+              <Button
+                onClick={() => handleSend()}
+                disabled={!canSend}
+                title={getSendTooltip()}
+                className="hidden md:inline-flex"
+              >
+                <Send className="w-4 h-4 mr-2" />
+                {t('send')}
+              </Button>
+            )}
           </div>
         </div>
 
@@ -2138,6 +2497,29 @@ export function EmailComposer({
         </div>
       )}
 
+      {showScheduleDialog && (
+        <div className="fixed inset-0 bg-black/50 flex items-center justify-center z-50 p-4 animate-in fade-in duration-150">
+          <div className="bg-background border border-border rounded-lg shadow-xl w-full max-w-md p-6 animate-in zoom-in-95 duration-200">
+            <h3 className="text-lg font-semibold text-foreground mb-2">{t('schedule_send')}</h3>
+            <p className="text-sm text-muted-foreground mb-4">{t('schedule_send_description')}</p>
+            <Input
+              type="datetime-local"
+              value={scheduleValue}
+              onChange={(e) => {
+                setScheduleValue(e.target.value);
+                setScheduleError('');
+              }}
+              className={cn(scheduleError && "border-destructive focus-visible:ring-destructive")}
+            />
+            {scheduleError && <p className="mt-2 text-sm text-destructive">{scheduleError}</p>}
+            <div className="mt-5 flex justify-end gap-2">
+              <Button variant="ghost" onClick={() => setShowScheduleDialog(false)}>{tCommon('cancel')}</Button>
+              <Button onClick={handleScheduleSend} disabled={!canSend}>{t('schedule_send')}</Button>
+            </div>
+          </div>
+        </div>
+      )}
+
       {/* S/MIME passphrase prompt */}
       {smimePassphrasePrompt && (
         <div
@@ -2214,7 +2596,7 @@ export function EmailComposer({
               <Button variant="outline" onClick={() => setShowAttachmentWarning(false)}>
                 {t('forgot_attachment.back')}
               </Button>
-              <Button onClick={() => { setShowAttachmentWarning(false); handleSend(true); }}>
+              <Button onClick={() => { setShowAttachmentWarning(false); handleSend(true, attachmentWarningDelayedUntil); setAttachmentWarningDelayedUntil(undefined); }}>
                 {t('forgot_attachment.send_anyway')}
               </Button>
             </div>
@@ -2253,6 +2635,15 @@ export function EmailComposer({
           </div>
         </div>
       )}
+
+      {previewAttachment && (
+        <FilePreviewModal
+          name={previewAttachment.name}
+          onClose={() => setPreviewAttachment(null)}
+          onDownload={handlePreviewAttachmentDownload}
+          getFileContent={getPreviewAttachmentContent}
+        />
+      )}
     </div>
       <PluginSlot
         name="composer-sidebar-right"
@@ -2461,6 +2852,11 @@ function RecipientChipInput({
           aria-controls={activeAutoField === field ? `autocomplete-${field}` : undefined}
           aria-activedescendant={activeAutoField === field && autoSelectedIndex >= 0 ? `autocomplete-option-${autoSelectedIndex}` : undefined}
           aria-invalid={validationError || undefined}
+          data-bwignore="true"
+          data-1p-ignore
+          data-op-ignore
+          data-lpignore="true"
+          data-form-type="other"
         />
       </div>
       {validationError && validationMessage && (

components/email/email-context-menu.tsx

@@ -30,6 +30,8 @@ import {
   ShieldAlert,
   ShieldCheck,
   EditIcon,
+  CalendarClock,
+  XCircle,
 } from "lucide-react";
 import { cn, buildMailboxTree, MailboxNode } from "@/lib/utils";
 import { useSettingsStore, KEYWORD_PALETTE } from "@/stores/settings-store";
@@ -63,6 +65,9 @@ interface EmailContextMenuProps {
   onMarkAsSpam?: () => void;
   onUndoSpam?: () => void;
   onEditDraft?: () => void;
+  onCancelScheduled?: () => void;
+  onCancelScheduledForEdit?: () => void;
+  onRescheduleScheduled?: () => void;
   // Batch actions
   onBatchMarkAsRead?: (read: boolean) => void;
   onBatchDelete?: () => void;
@@ -133,6 +138,9 @@ export function EmailContextMenu({
   onBatchMarkAsSpam,
   onBatchUndoSpam,
   onEditDraft,
+  onCancelScheduled,
+  onCancelScheduledForEdit,
+  onRescheduleScheduled,
 }: EmailContextMenuProps) {
   const t = useTranslations("context_menu");
   const _tColor = useTranslations("email_viewer.color_tag");
@@ -143,6 +151,8 @@ export function EmailContextMenu({
   const currentColors = getCurrentColors(email.keywords);
   const showBatchActions = isMultiSelect && selectedCount > 1;
   const isInJunkFolder = currentMailboxRole === 'junk';
+  const isScheduled = email.isScheduled === true;
+  const canCancelScheduled = isScheduled && email.scheduledUndoStatus === 'pending';
 
   // Build color options from keyword definitions in settings
   const colorOptions = emailKeywords.map((kw) => ({
@@ -196,8 +206,36 @@ export function EmailContextMenu({
         </ContextMenuHeader>
       )}
 
+      {isScheduled && !showBatchActions && canCancelScheduled && (
+        <>
+          <ContextMenuItem
+            icon={CalendarClock}
+            label={t("reschedule_send")}
+            onClick={() => handleAction(onRescheduleScheduled!)}
+            disabled={!onRescheduleScheduled}
+          />
+          <ContextMenuItem
+            icon={XCircle}
+            label={t("cancel_scheduled_send")}
+            onClick={() => handleAction(onCancelScheduled!)}
+            disabled={!onCancelScheduled}
+          />
+          <ContextMenuItem
+            icon={EditIcon}
+            label={email.isSmimeScheduled ? t("cancel_and_compose_again") : t("cancel_and_edit")}
+            onClick={() => handleAction(onCancelScheduledForEdit!)}
+            disabled={!onCancelScheduledForEdit}
+          />
+        </>
+      )}
+
+      {canCancelScheduled && <ContextMenuSeparator />}
+
+      {!isScheduled && (
+        <>
+
       {/* Edit Draft - only for single draft emails */}
-      {!showBatchActions && isDraft && onEditDraft && (
+      {!isScheduled && !showBatchActions && isDraft && onEditDraft && (
         <>
           <ContextMenuItem
             icon={EditIcon}
@@ -209,7 +247,7 @@ export function EmailContextMenu({
       )}
 
       {/* Single email actions - Reply, Reply All, Forward */}
-      {!showBatchActions && (
+      {!isScheduled && !showBatchActions && (
         <>
           <ContextMenuItem
             icon={Reply}
@@ -375,6 +413,8 @@ export function EmailContextMenu({
           )
         }
       />
+        </>
+      )}
 
       <PluginSlot name="context-menu-email" />
     </ContextMenu>

components/email/email-identity-badge.tsx

@@ -5,6 +5,7 @@ import { Mail, Tag } from 'lucide-react';
 import { cn } from '@/lib/utils';
 import type { Email, Identity } from '@/lib/jmap/types';
 import { parseSubAddress } from '@/lib/sub-addressing';
+import { isAuthenticationSpoofed } from '@/lib/email-headers';
 import { useSettingsStore } from '@/stores/settings-store';
 
 interface EmailIdentityBadgeProps {
@@ -29,10 +30,17 @@ export function EmailIdentityBadge({
   // Parse the from address to check for sub-addressing
   const parsedFrom = parseSubAddress(fromAddress, subAddressDelimiter);
 
-  // Find matching identity (email sent BY the user)
+  // Find matching identity (email sent BY the user). When the message is
-  const matchingIdentity = identities.find(
+  // likely spoofed, the From address can't be trusted, so we ignore any
-    (identity) => identity.email === fromAddress || identity.email === `${parsedFrom.baseUser}@${parsedFrom.domain}`
+  // identity match — otherwise a forged From matching one of the user's own
-  );
+  // addresses would render a misleading "via <identity>" badge that implies
+  // legitimacy.
+  const spoofed = isAuthenticationSpoofed(email.authenticationResults);
+  const matchingIdentity = spoofed
+    ? undefined
+    : identities.find(
+        (identity) => identity.email === fromAddress || identity.email === `${parsedFrom.baseUser}@${parsedFrom.domain}`
+      );
 
   // Check if email was sent TO a sub-address (received email)
   let receivedToTag: string | null = null;

components/email/email-list-item.tsx

@@ -50,7 +50,9 @@ export function EmailListItem({ email, selected, onClick, onDoubleClick, onConte
   const currentMailboxRole = mailboxes.find(mb => mb.id === selectedMailbox)?.role;
   const showRecipient = currentMailboxRole === 'sent' || currentMailboxRole === 'drafts';
   const sender = showRecipient ? (email.to?.[0] ?? email.from?.[0]) : email.from?.[0];
-  const isFocusedMailLayout = mailLayout === 'focus';
+  const isMobile = useUIStore((state) => state.isMobile);
+  // The horizontal one-line "focus" layout doesn't fit on narrow screens; fall back to multi-line on mobile.
+  const isFocusedMailLayout = mailLayout === 'focus' && !isMobile;
   const hideJunkAvatarImages = currentMailboxRole === 'junk' && !showAvatarsInJunk;
   const trimmedPreview = stripInvisibleLeading(email.preview ?? '');
   const inlinePreview = showPreview && trimmedPreview ? ` ${trimmedPreview}` : '';
@@ -68,8 +70,6 @@ export function EmailListItem({ email, selected, onClick, onDoubleClick, onConte
     sourceMailboxId: selectedMailbox,
   });
 
-  const isMobile = useUIStore((state) => state.isMobile);
-
   const { onTouchStart, onTouchEnd, onTouchMove, onTouchCancel, isPressed } = useLongPress(
     useCallback((pos) => {
       onContextMenu?.(

components/email/email-list.tsx

@@ -4,13 +4,14 @@ import { Email, ThreadGroup } from "@/lib/jmap/types";
 import { ThreadListItem } from "./thread-list-item";
 import { EmailContextMenu } from "./email-context-menu";
 import { cn } from "@/lib/utils";
-import { Trash2, Mail, MailX, MailOpen, Loader2, SearchX, AlertTriangle } from "lucide-react";
+import { Trash2, Mail, MailX, MailOpen, Loader2, SearchX, AlertTriangle, CalendarClock } from "lucide-react";
 import { useState, useEffect, useRef, useCallback, useMemo } from "react";
 import { Button } from "@/components/ui/button";
 import { ConfirmDialog } from "@/components/ui/confirm-dialog";
 import { useEmailStore } from "@/stores/email-store";
 import { useAuthStore } from "@/stores/auth-store";
 import { useSettingsStore } from "@/stores/settings-store";
+import { useUIStore } from "@/stores/ui-store";
 import { groupEmailsByThread, sortThreadGroups } from "@/lib/thread-utils";
 import { useContextMenu } from "@/hooks/use-context-menu";
 import { useConfirmDialog } from "@/hooks/use-confirm-dialog";
@@ -26,6 +27,8 @@ interface EmailListProps {
   onEmailDoubleClick?: (email: Email) => void;
   className?: string;
   isLoading?: boolean;
+  hasMore?: boolean;
+  isLoadingMoreItems?: boolean;
   onOpenConversation?: (thread: ThreadGroup) => void;
   onReply?: (email: Email) => void;
   onReplyAll?: (email: Email) => void;
@@ -39,6 +42,11 @@ interface EmailListProps {
   onMarkAsSpam?: (email: Email) => void;
   onUndoSpam?: (email: Email) => void;
   onEditDraft?: (email: Email) => void;
+  isScheduledView?: boolean;
+  onLoadMoreScheduled?: () => void;
+  onCancelScheduled?: (email: Email) => void | Promise<void>;
+  onCancelScheduledForEdit?: (email: Email) => void | Promise<void>;
+  onRescheduleScheduled?: (email: Email) => void | Promise<void>;
 }
 
 export function EmailList({
@@ -48,6 +56,8 @@ export function EmailList({
   onEmailDoubleClick,
   className,
   isLoading = false,
+  hasMore,
+  isLoadingMoreItems,
   onOpenConversation,
   onReply,
   onReplyAll,
@@ -61,6 +71,11 @@ export function EmailList({
   onUndoSpam,
   onMoveToMailbox,
   onEditDraft,
+  isScheduledView = false,
+  onLoadMoreScheduled,
+  onCancelScheduled,
+  onCancelScheduledForEdit,
+  onRescheduleScheduled,
 }: EmailListProps) {
   const t = useTranslations('email_list');
   const { client } = useAuthStore();
@@ -95,9 +110,9 @@ export function EmailList({
   const disableThreading = useSettingsStore((state) => state.disableThreading);
 
   const threadGroups = useMemo(() => {
-    const groups = groupEmailsByThread(emails, disableThreading);
+    const groups = groupEmailsByThread(emails, disableThreading || isScheduledView);
     return sortThreadGroups(groups);
-  }, [emails, disableThreading]);
+  }, [emails, disableThreading, isScheduledView]);
 
   const { contextMenu, openContextMenu, closeContextMenu, menuRef } = useContextMenu<Email>();
   const { dialogProps: confirmDialogProps, confirm: confirmDialog } = useConfirmDialog();
@@ -107,7 +122,11 @@ export function EmailList({
   const density = useSettingsStore((state) => state.density);
   const showPreview = useSettingsStore((state) => state.showPreview);
   const mailLayout = useSettingsStore((state) => state.mailLayout);
-  const isFocusedMailLayout = mailLayout === 'focus';
+  const footerHasMore = hasMore ?? hasMoreEmails;
+  const footerIsLoadingMore = isLoadingMoreItems ?? isLoadingMore;
+  const isMobile = useUIStore((state) => state.isMobile);
+  // Match the list items: focus layout collapses to multi-line on mobile, so virtualizer estimates must match.
+  const isFocusedMailLayout = mailLayout === 'focus' && !isMobile;
 
   const estimateSize = useCallback(() => {
     if (isFocusedMailLayout) {
@@ -216,10 +235,14 @@ export function EmailList({
   };
 
   const handleLoadMore = useCallback(() => {
+    if (isScheduledView) {
+      onLoadMoreScheduled?.();
+      return;
+    }
     if (client && hasMoreEmails && !isLoadingMore && !isLoading) {
       loadMoreEmails(client);
     }
-  }, [client, hasMoreEmails, isLoadingMore, isLoading, loadMoreEmails]);
+  }, [client, hasMoreEmails, isLoadingMore, isLoading, isScheduledView, loadMoreEmails, onLoadMoreScheduled]);
 
   const handleToggleThreadExpansion = useCallback(async (threadId: string) => {
     const isExpanded = expandedThreadIds.has(threadId);
@@ -279,7 +302,7 @@ export function EmailList({
       <div
         className={cn(
           "transition-all duration-300 ease-in-out overflow-hidden",
-          hasSelection ? "max-h-16 opacity-100" : "max-h-0 opacity-0"
+          hasSelection && !isScheduledView ? "max-h-16 opacity-100" : "max-h-0 opacity-0"
         )}
       >
         <div className="px-4 py-2 border-b bg-accent/30 border-border flex items-center justify-between">
@@ -403,17 +426,19 @@ export function EmailList({
         ) : emails.length === 0 && !isLoading ? (
           <div className="flex flex-col items-center justify-center h-full py-12">
             <div className="w-20 h-20 mx-auto mb-6 rounded-full bg-muted shadow-lg flex items-center justify-center">
-              {searchQuery || !isFilterEmpty(searchFilters) ? (
+              {isScheduledView ? (
+                <CalendarClock className="w-10 h-10 text-muted-foreground" />
+              ) : searchQuery || !isFilterEmpty(searchFilters) ? (
                 <SearchX className="w-10 h-10 text-muted-foreground" />
               ) : (
                 <MailX className="w-10 h-10 text-muted-foreground" />
               )}
             </div>
             <p className="text-base font-medium text-foreground">
-              {searchQuery || !isFilterEmpty(searchFilters) ? t('no_search_results') : t('no_emails')}
+              {isScheduledView ? t('no_scheduled_emails') : searchQuery || !isFilterEmpty(searchFilters) ? t('no_search_results') : t('no_emails')}
             </p>
             <p className="text-sm mt-1 text-muted-foreground">
-              {searchQuery || !isFilterEmpty(searchFilters) ? t('no_search_results_description') : t('no_emails_description')}
+              {isScheduledView ? t('no_scheduled_emails_description') : searchQuery || !isFilterEmpty(searchFilters) ? t('no_search_results_description') : t('no_emails_description')}
             </p>
           </div>
         ) : (
@@ -465,13 +490,13 @@ export function EmailList({
             </div>
 
             <div className="py-4 flex justify-center">
-              {isLoadingMore && hasMoreEmails && (
+              {footerIsLoadingMore && footerHasMore && (
                 <div className="flex items-center gap-2 text-sm text-muted-foreground">
                   <Loader2 className="w-4 h-4 animate-spin" />
                   <span>{t('loading_more')}</span>
                 </div>
               )}
-              {!hasMoreEmails && emails.length > 0 && (
+              {!footerHasMore && emails.length > 0 && (
                 <div className="text-sm text-muted-foreground border-t border-border pt-6">
                   {t('no_more_emails')}
                 </div>
@@ -506,6 +531,9 @@ export function EmailList({
           onMarkAsSpam={() => onMarkAsSpam?.(contextMenu.data!)}
           onUndoSpam={() => onUndoSpam?.(contextMenu.data!)}
           onEditDraft={() => onEditDraft?.(contextMenu.data!)}
+          onCancelScheduled={onCancelScheduled ? () => onCancelScheduled(contextMenu.data!) : undefined}
+          onCancelScheduledForEdit={onCancelScheduledForEdit ? () => onCancelScheduledForEdit(contextMenu.data!) : undefined}
+          onRescheduleScheduled={onRescheduleScheduled ? () => onRescheduleScheduled(contextMenu.data!) : undefined}
           onBatchMarkAsRead={(read) => client && batchMarkAsRead(client, read)}
           onBatchDelete={() => client && batchDelete(client)}
           onBatchArchive={async () => {

components/email/email-viewer.tsx

@@ -3,8 +3,11 @@
 import { useState, useEffect, useLayoutEffect, useMemo, useRef, useCallback } from "react";
 import DOMPurify from "dompurify";
 import { Email, ContactCard, Mailbox } from "@/lib/jmap/types";
+import { emailExportFilename, attachmentDownloadFilename, DEFAULT_EMAIL_TEMPLATE, DEFAULT_ATTACHMENT_TEMPLATE } from "@/lib/download-filename";
+import { EML_IMPORT_ACCEPT, expandImportableEmails } from "@/lib/eml-import";
 import { EMAIL_IFRAME_SANITIZE_CONFIG, collapseBlockedImageContainers, escapeHtml, plainTextToSafeHtml, sanitizeEmailHtml, sanitizePlainTextRenderedHtml } from "@/lib/email-sanitization";
 import { hasMeaningfulHtmlBody } from "@/lib/signature-utils";
+import { withBasePath } from "@/lib/browser-navigation";
 import { Button } from "@/components/ui/button";
 import { Avatar } from "@/components/ui/avatar";
 import { formatFileSize, cn, buildMailboxTree, MailboxNode, formatDateTime, generateUUID } from "@/lib/utils";
@@ -63,6 +66,7 @@ import {
   EditIcon,
   PlayCircle,
   PenSquare,
+  CalendarClock,
 } from "lucide-react";
 import { useTranslations } from "next-intl";
 import { useRouter } from "@/i18n/navigation";
@@ -73,11 +77,14 @@ import { useContactStore, getContactDisplayName, getContactPrimaryEmail } from "
 import { toast } from "@/stores/toast-store";
 import { useDeviceDetection } from "@/hooks/use-media-query";
 import { useAuthStore } from "@/stores/auth-store";
+import { useAccountStore } from "@/stores/account-store";
 import { useEmailStore } from "@/stores/email-store";
 import { useThemeStore } from "@/stores/theme-store";
 import { EmailIdentityBadge } from "./email-identity-badge";
 import { UnsubscribeBanner } from "./unsubscribe-banner";
 import { CalendarInvitationBanner } from "./calendar-invitation-banner";
+import { ReadReceiptBanner } from "./read-receipt-banner";
+import { stripCrossAccountIdentityPrefix } from "@/hooks/use-pro-multi-account-identities";
 import { useTour } from "@/components/tour/tour-provider";
 import { useIsEmbedded } from "@/hooks/use-is-embedded";
 import { SmimePassphraseDialog } from "@/components/settings/smime-passphrase-dialog";
@@ -122,6 +129,9 @@ interface EmailViewerProps {
   onNavigatePrev?: () => void;
   onShowShortcuts?: () => void;
   onEditDraft?: () => void;
+  onCancelScheduled?: () => void;
+  onCancelScheduledForEdit?: () => void;
+  onRescheduleScheduled?: (delayedUntil: string) => void;
   onCompose?: () => void;
   currentUserEmail?: string;
   currentUserName?: string;
@@ -799,6 +809,7 @@ interface DraggableAttachmentChipProps {
   attachment: EffectiveAttachment;
   client: IJMAPClient | null;
   enabled: boolean;
+  downloadName?: string;
   children: (dragProps: {
     draggable: boolean;
     onPointerEnter: () => void;
@@ -807,9 +818,9 @@ interface DraggableAttachmentChipProps {
   }) => React.ReactNode;
 }
 
-function DraggableAttachmentChip({ attachment, client, enabled, children }: DraggableAttachmentChipProps) {
+function DraggableAttachmentChip({ attachment, client, enabled, downloadName, children }: DraggableAttachmentChipProps) {
   const source = useMemo<AttachmentDragSource>(() => ({
-    name: attachment.name || 'download',
+    name: downloadName || attachment.name || 'download',
     type: attachment.type || 'application/octet-stream',
     getBlobUrl: async () => {
       if (attachment.blobId && client) {
@@ -832,7 +843,7 @@ function DraggableAttachmentChip({ attachment, client, enabled, children }: Drag
       }
       return null;
     },
-  }), [attachment, client]);
+  }), [attachment, client, downloadName]);
   const drag = useAttachmentDrag(source, enabled);
   return <>{children(drag)}</>;
 }
@@ -870,6 +881,9 @@ export function EmailViewer({
   onNavigatePrev,
   onShowShortcuts,
   onEditDraft,
+  onCancelScheduled,
+  onCancelScheduledForEdit,
+  onRescheduleScheduled,
   onCompose,
   currentUserEmail,
   currentUserName,
@@ -879,6 +893,7 @@ export function EmailViewer({
   className,
 }: EmailViewerProps) {
   const t = useTranslations('email_viewer');
+  const tComposer = useTranslations('email_composer');
   const tNotifications = useTranslations('notifications');
   const tCommon = useTranslations('common');
   const tSmime = useTranslations('smime');
@@ -898,9 +913,30 @@ export function EmailViewer({
   const showToolbarLabels = useSettingsStore((state) => state.showToolbarLabels);
   const mailLayout = useSettingsStore((state) => state.mailLayout);
   const calendarInvitationParsingEnabled = useSettingsStore((state) => state.calendarInvitationParsingEnabled);
+  const readReceiptResponse = useSettingsStore((state) => state.readReceiptResponse);
   const hideInlineImageAttachments = useSettingsStore((state) => state.hideInlineImageAttachments);
   const attachmentImagePreviewsEnabled = useSettingsStore((state) => state.attachmentImagePreviewsEnabled);
   const dragOutActive = useMemo(() => isDragOutSupported(), []);
+  const emailDownloadTemplate = useSettingsStore((state) => state.emailDownloadTemplate) || DEFAULT_EMAIL_TEMPLATE;
+  const attachmentDownloadTemplate = useSettingsStore((state) => state.attachmentDownloadTemplate) || DEFAULT_ATTACHMENT_TEMPLATE;
+  const filenameSpaceReplacement = useSettingsStore((state) => state.filenameSpaceReplacement);
+  const filenameLowercase = useSettingsStore((state) => state.filenameLowercase);
+  const filenameStripDiacritics = useSettingsStore((state) => state.filenameStripDiacritics);
+  const filenameCollapseSeparators = useSettingsStore((state) => state.filenameCollapseSeparators);
+  const emailFilenameOptions = useMemo(() => ({
+    template: emailDownloadTemplate,
+    spaceReplacement: filenameSpaceReplacement,
+    lowercase: filenameLowercase,
+    stripDiacritics: filenameStripDiacritics,
+    collapseSeparators: filenameCollapseSeparators,
+  }), [emailDownloadTemplate, filenameSpaceReplacement, filenameLowercase, filenameStripDiacritics, filenameCollapseSeparators]);
+  const attachmentFilenameOptions = useMemo(() => ({
+    template: attachmentDownloadTemplate,
+    spaceReplacement: filenameSpaceReplacement,
+    lowercase: filenameLowercase,
+    stripDiacritics: filenameStripDiacritics,
+    collapseSeparators: filenameCollapseSeparators,
+  }), [attachmentDownloadTemplate, filenameSpaceReplacement, filenameLowercase, filenameStripDiacritics, filenameCollapseSeparators]);
   const timeFormat = useSettingsStore((state) => state.timeFormat);
   const isFocusedMailLayout = mailLayout === 'focus';
 
@@ -909,6 +945,8 @@ export function EmailViewer({
 
   // Detect if the email is a draft
   const isDraft = email?.keywords?.['$draft'] === true;
+  const isScheduled = email?.isScheduled === true;
+  const canCancelScheduled = isScheduled && email?.scheduledUndoStatus === 'pending';
 
   // Color options for email tags (from user-defined keyword settings)
   const colorOptions = emailKeywords.map((kw) => ({
@@ -921,6 +959,30 @@ export function EmailViewer({
   const { isTablet, isMobile } = useDeviceDetection();
   const { tabletListVisible } = useUIStore();
   const { identities, client, isDemoMode, activeAccountId } = useAuthStore();
+  const activeAccount = useAccountStore((s) => s.accounts.find((a) => a.id === activeAccountId));
+  const promptForRescheduleDelayedUntil = useCallback((): string | null => {
+    const value = window.prompt(t('reschedule_prompt'));
+    if (!value) return null;
+    const time = new Date(value).getTime();
+    if (!Number.isFinite(time)) {
+      toast.error(tComposer('schedule_send_invalid'));
+      return null;
+    }
+    if (time <= Date.now()) {
+      toast.error(tComposer('schedule_send_future'));
+      return null;
+    }
+    if (!client?.hasDelayedSend()) {
+      toast.error(tComposer('schedule_send_unsupported'));
+      return null;
+    }
+    const maxDelayedSend = client.getMaxDelayedSend();
+    if (maxDelayedSend > 0 && time > Date.now() + maxDelayedSend * 1000) {
+      toast.error(tComposer('schedule_send_too_late'));
+      return null;
+    }
+    return new Date(time).toISOString();
+  }, [client, t, tComposer]);
   const resolvedTheme = useThemeStore((state) => state.resolvedTheme);
   const { startTour } = useTour();
   const isEmbedded = useIsEmbedded();
@@ -2134,6 +2196,9 @@ export function EmailViewer({
       // Hide inline cid-referenced images when the user has opted to keep them
       // out of the attachment list (default on): these are embedded in the body.
       .filter(att => !(hideInlineImageAttachments && att.cid && att.disposition === 'inline' && (att.type || '').startsWith('image/')))
+      // Hide machine-readable report parts (MDN read-receipts, DSN bounce
+      // reports). These are required MIME parts, not real user attachments.
+      .filter(att => att.type !== 'message/disposition-notification' && att.type !== 'message/delivery-status')
       .map((attachment, index) => ({
         id: attachment.blobId || `${attachment.name || 'attachment'}-${index}`,
         name: attachment.name || null,
@@ -2561,6 +2626,15 @@ export function EmailViewer({
     return emailContent;
   }, [cidBlobUrls, emailContent, smimeDecryptedHtml, smimeDecryptedText, tnefHtml, tnefText, embeddedEmailHtml, embeddedEmailText]);
 
+  const resolveAttachmentName = useCallback(
+    (attachment: EffectiveAttachment) => {
+      const fallback = attachment.name || 'download';
+      if (!email) return fallback;
+      return attachmentDownloadFilename(email, { name: attachment.name, type: attachment.type }, attachmentFilenameOptions) || fallback;
+    },
+    [email, attachmentFilenameOptions],
+  );
+
   const handleEffectiveAttachmentOpen = useCallback(async (attachment: EffectiveAttachment) => {
     const isPreviewable = isFilePreviewable(attachment.name || undefined, attachment.type);
     // Blob URLs inherit our origin; script-bearing MIME types (text/html,
@@ -2570,6 +2644,8 @@ export function EmailViewer({
       && mailAttachmentAction === 'preview'
       && isMimeTypeSafeForInlinePreview(attachment.type);
 
+    const downloadName = resolveAttachmentName(attachment);
+
     const info: AttachmentInfo = {
       name: attachment.name || '',
       type: attachment.type,
@@ -2580,7 +2656,7 @@ export function EmailViewer({
 
     if (attachment.blobId && onDownloadAttachment) {
       emailHooks.onAttachmentDownload.emit(info);
-      onDownloadAttachment(attachment.blobId, attachment.name || 'download', attachment.type);
+      onDownloadAttachment(attachment.blobId, downloadName, attachment.type);
       return;
     }
 
@@ -2600,7 +2676,7 @@ export function EmailViewer({
         emailHooks.onAttachmentDownload.emit(info);
         const anchor = document.createElement('a');
         anchor.href = objectUrl;
-        anchor.download = attachment.name || 'download';
+        anchor.download = downloadName;
         document.body.appendChild(anchor);
         anchor.click();
         anchor.remove();
@@ -2630,16 +2706,17 @@ export function EmailViewer({
       emailHooks.onAttachmentDownload.emit(info);
       const anchor = document.createElement('a');
       anchor.href = objectUrl;
-      anchor.download = attachment.name || 'download';
+      anchor.download = downloadName;
       document.body.appendChild(anchor);
       anchor.click();
       anchor.remove();
     }
 
     setTimeout(() => URL.revokeObjectURL(objectUrl), 60_000);
-  }, [mailAttachmentAction, onDownloadAttachment, email?.id]);
+  }, [mailAttachmentAction, onDownloadAttachment, email, resolveAttachmentName]);
 
   const handleEffectiveAttachmentDownload = useCallback((attachment: EffectiveAttachment) => {
+    const downloadName = resolveAttachmentName(attachment);
     const info: AttachmentInfo = {
       name: attachment.name || '',
       type: attachment.type,
@@ -2649,7 +2726,7 @@ export function EmailViewer({
     };
     emailHooks.onAttachmentDownload.emit(info);
     if (attachment.blobId && onDownloadAttachment) {
-      onDownloadAttachment(attachment.blobId, attachment.name || 'download', attachment.type, true);
+      onDownloadAttachment(attachment.blobId, downloadName, attachment.type, true);
       return;
     }
 
@@ -2662,7 +2739,7 @@ export function EmailViewer({
       const objectUrl = URL.createObjectURL(blob);
       const anchor = document.createElement('a');
       anchor.href = objectUrl;
-      anchor.download = attachment.name || 'download';
+      anchor.download = downloadName;
       document.body.appendChild(anchor);
       anchor.click();
       anchor.remove();
@@ -2678,12 +2755,12 @@ export function EmailViewer({
     const objectUrl = URL.createObjectURL(blob);
     const anchor = document.createElement('a');
     anchor.href = objectUrl;
-    anchor.download = attachment.name || 'download';
+    anchor.download = downloadName;
     document.body.appendChild(anchor);
     anchor.click();
     anchor.remove();
     setTimeout(() => URL.revokeObjectURL(objectUrl), 60_000);
-  }, [onDownloadAttachment, email?.id]);
+  }, [onDownloadAttachment, email?.id, resolveAttachmentName]);
 
   // Pre-fetch object URLs for image attachments so their actual contents can be
   // rendered as thumbnails inside the chip. Skips images larger than 10 MB.
@@ -2799,7 +2876,9 @@ export function EmailViewer({
     // Word/Outlook HTML emails ship a <style> block but put their gutter in
     // @page margins (print-only), so they need a fallback body padding too.
     const isWordHtml = /class=["']?(?:Mso|WordSection)|<o:p[\s>/]|urn:schemas-microsoft-com:office:office/i.test(effectiveEmailContent.html);
-    const bodyPadding = (effectiveEmailContent.hasStyleTag && !isWordHtml) ? '0' : '1rem 1.25rem';
+    const hasOwnLayout = effectiveEmailContent.hasStyleTag && !isWordHtml;
+    const bodyPadding = hasOwnLayout ? '0' : '1rem 1.25rem';
+    const mobileBodyPaddingX = hasOwnLayout ? '0' : '0.75rem';
 
     // Word emails rely on empty <p class=MsoNormal>&nbsp;</p> spacers for vertical
     // rhythm. With our default line-height: 1.6 these stack into oversized gaps;
@@ -2820,13 +2899,16 @@ export function EmailViewer({
 <html style="color-scheme: ${colorScheme};"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1">
 <meta http-equiv="Content-Security-Policy" content="${iframeCsp}">
 <style>
-  html, body { overflow: hidden; }
+  /* Force content height: some emails set html/body { height: 100% }, which -
+     combined with overflow:hidden and our scrollHeight-based auto-resize -
+     collapses the measured height and clips everything below the fold. */
+  html, body { overflow: hidden; height: auto !important; }
   body { margin: 0; padding: ${bodyPadding}; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; font-size: 14px; line-height: 1.6; color: #1a1a1a; background: #ffffff; word-wrap: break-word; overflow-wrap: break-word; }
-  @media (max-width: 640px) { body { padding-left: 0; padding-right: 0; } }
+  @media (max-width: 640px) { body { padding-left: ${mobileBodyPaddingX}; padding-right: ${mobileBodyPaddingX}; } }
   img { max-width: 100% !important; height: auto !important; }
   a { color: #1a73e8; }
   table { max-width: 100% !important; table-layout: auto; overflow-wrap: break-word; }
-  td, th { word-break: break-word; }
+  td, th { overflow-wrap: anywhere; }
   pre { white-space: pre-wrap; word-wrap: break-word; }
   ${wordHtmlCSS}
   ${darkModeCSS}
@@ -3056,35 +3138,58 @@ export function EmailViewer({
   const handleExportEmail = async () => {
     if (!email?.blobId || !client) return;
     try {
-      const subject = (email.subject || 'email').replace(/[<>:"/\\|?*]+/g, '_').slice(0, 100);
+      await client.downloadBlob(email.blobId, emailExportFilename(email, emailFilenameOptions), 'message/rfc822');
-      await client.downloadBlob(email.blobId, `${subject}.eml`, 'message/rfc822');
     } catch {
       toast.error(tNotifications('export_email_error'));
+      return;
     }
+    const action = useSettingsStore.getState().postExportAction;
+    if (action === 'archive') onArchive?.();
+    else if (action === 'trash') onDelete?.();
   };
 
-  // Import email from .eml file
+  // Import email from .eml file or .zip archive containing .eml files
   const handleImportEmail = () => {
     if (!client) return;
     const input = document.createElement('input');
     input.type = 'file';
-    input.accept = '.eml,message/rfc822';
+    input.accept = EML_IMPORT_ACCEPT;
+    input.multiple = true;
     input.onchange = async (e) => {
-      const file = (e.target as HTMLInputElement).files?.[0];
+      const files = Array.from((e.target as HTMLInputElement).files ?? []);
-      if (!file) return;
+      if (files.length === 0) return;
+      const { selectedMailbox, mailboxes, fetchEmails } = useEmailStore.getState();
+      const mailbox = mailboxes.find(mb => mb.id === selectedMailbox);
+      const mailboxId = mailbox?.originalId || selectedMailbox;
+      if (!mailboxId) {
+        toast.error(tNotifications('import_email_error'));
+        return;
+      }
+
+      let emails;
       try {
-        const { selectedMailbox, mailboxes, fetchEmails } = useEmailStore.getState();
+        emails = await expandImportableEmails(files);
-        const mailbox = mailboxes.find(mb => mb.id === selectedMailbox);
+      } catch {
-        const mailboxId = mailbox?.originalId || selectedMailbox;
+        toast.error(tNotifications('import_email_error'));
-        if (!mailboxId) {
+        return;
-          toast.error(tNotifications('import_email_error'));
+      }
-          return;
+
+      let imported = 0;
+      let failed = 0;
+      for (const { blob } of emails) {
+        try {
+          await client.importRawEmail(blob, { [mailboxId]: true }, { '$seen': true });
+          imported++;
+        } catch {
+          failed++;
         }
-        const blob = new Blob([await file.arrayBuffer()], { type: 'message/rfc822' });
+      }
-        await client.importRawEmail(blob, { [mailboxId]: true }, { '$seen': true });
+
+      if (imported > 0) {
         toast.success(tNotifications('import_email_success'));
         await fetchEmails(client);
-      } catch {
+      }
+      if (failed > 0 || emails.length === 0) {
         toast.error(tNotifications('import_email_error'));
       }
     };
@@ -3156,6 +3261,103 @@ export function EmailViewer({
     ? calendarInvitationParsingEnabled && !!findCalendarAttachment(email)
     : false;
 
+  // ── Read receipt (MDN, RFC 8098) ──────────────────────────────
+  // Detect a Disposition-Notification-To request on the open message. The
+  // header is parsed into email.headers by the client; look it up
+  // case-insensitively and extract the bare address.
+  const readReceiptRequestedBy = useMemo(() => {
+    const headers = email?.headers as Record<string, string | string[]> | undefined;
+    if (!headers) return null;
+    let raw: string | undefined;
+    for (const key of Object.keys(headers)) {
+      if (key.toLowerCase() === 'disposition-notification-to') {
+        const v = headers[key];
+        raw = Array.isArray(v) ? v[0] : v;
+        break;
+      }
+    }
+    if (!raw) return null;
+    const m = raw.match(/<([^>]+)>/);
+    const addr = (m ? m[1] : raw).trim();
+    return addr || null;
+  }, [email?.headers]);
+
+  // The identity whose address received the original message — the MDN is sent
+  // "from" that address. Falls back to the primary identity.
+  const receiptIdentity = useMemo(() => {
+    if (!identities?.length) return null;
+    const recipients = [...(email?.to || []), ...(email?.cc || [])]
+      .map(r => r.email?.toLowerCase())
+      .filter(Boolean);
+    return identities.find(i => recipients.includes(i.email?.toLowerCase())) || identities[0];
+  }, [identities, email?.to, email?.cc]);
+
+  const mdnAlreadyHandled = email?.keywords?.['$mdnsent'] === true;
+  const [mdnHandledLocally, setMdnHandledLocally] = useState(false);
+  useEffect(() => { setMdnHandledLocally(false); }, [email?.id]);
+
+  // Only offer the receipt for mail you're actually reading in a "received"
+  // location. Suppress your own copies (sent/drafts), discarded mail (trash),
+  // and spam (junk) - never confirm your address to spammers. Inbox, Archive
+  // and user folders all qualify.
+  const inReceiptEligibleFolder = !['sent', 'drafts', 'trash', 'junk'].includes(currentMailboxRole || '');
+
+  const shouldOfferReadReceipt =
+    !!readReceiptRequestedBy &&
+    !mdnAlreadyHandled &&
+    !mdnHandledLocally &&
+    readReceiptResponse !== 'never' &&
+    inReceiptEligibleFolder &&
+    !isDraft &&
+    !!receiptIdentity;
+
+  const sendReadReceiptNow = useCallback(async (automatic: boolean) => {
+    if (!client || !email || !readReceiptRequestedBy || !receiptIdentity) return;
+    const { rawId } = stripCrossAccountIdentityPrefix(receiptIdentity.id);
+    try {
+      await client.sendReadReceipt({
+        to: readReceiptRequestedBy,
+        fromEmail: receiptIdentity.email,
+        fromName: receiptIdentity.name,
+        identityId: rawId ?? receiptIdentity.id,
+        originalMessageId: email.messageId,
+        originalSubject: email.subject,
+        originalRecipient: receiptIdentity.email,
+        automatic,
+        subject: t('read_receipt.mdn_subject', { subject: email.subject || '' }),
+        humanText: t('read_receipt.mdn_body', { recipient: receiptIdentity.email }),
+      });
+      await client.setKeyword(email.id, '$mdnsent');
+    } catch (err) {
+      // Surface the failure instead of silently resetting the banner so we can
+      // see which step (upload / import / submission) failed.
+      console.error('Read-receipt (MDN) send failed:', err);
+      toast.error(t('read_receipt.send_failed'), {
+        message: err instanceof Error ? err.message : String(err),
+      });
+      throw err;
+    }
+  }, [client, email, readReceiptRequestedBy, receiptIdentity, t]);
+
+  const ignoreReadReceipt = useCallback(async () => {
+    setMdnHandledLocally(true);
+    if (client && email) {
+      // $MDNSent is the RFC 3503 flag every IMAP/JMAP client honours, so the
+      // request is suppressed everywhere - not just locally.
+      try { await client.setKeyword(email.id, '$mdnsent'); } catch { /* best effort */ }
+    }
+  }, [client, email]);
+
+  // "always" mode: auto-send the MDN once when the message is opened.
+  const autoMdnRef = useRef<string | null>(null);
+  useEffect(() => {
+    if (readReceiptResponse !== 'always') return;
+    if (!shouldOfferReadReceipt || !email) return;
+    if (autoMdnRef.current === email.id) return;
+    autoMdnRef.current = email.id;
+    sendReadReceiptNow(true).catch(() => { autoMdnRef.current = null; });
+  }, [readReceiptResponse, shouldOfferReadReceipt, email?.id, sendReadReceiptNow]);
+
   // Show loading skeleton while email is being fetched
   if (isLoading && !email) {
     return (
@@ -3208,9 +3410,9 @@ export function EmailViewer({
 
   if (!email) {
     if (isDemoMode) {
-      const logoSrc = resolvedTheme === 'dark'
+      const logoSrc = withBasePath(resolvedTheme === 'dark'
         ? '/branding/Bulwark_Logo_with_Lettering_White_and_Color.svg'
-        : '/branding/Bulwark_Logo_with_Lettering_Dark_Color.svg';
+        : '/branding/Bulwark_Logo_with_Lettering_Dark_Color.svg');
       return (
         <div className={cn("flex-1 flex flex-col items-center justify-center bg-gradient-to-br from-muted/30 to-muted/50", className)}>
           <div className="text-center p-8 max-w-md">
@@ -3295,7 +3497,32 @@ export function EmailViewer({
             <ChevronLeft className="w-5 h-5" />
           </Button>
         )}
-        {isDraft && onEditDraft && (
+        {isScheduled && canCancelScheduled && (
+          <>
+            <Button variant="default" size="sm" onClick={onCancelScheduled} className="sm:flex sm:h-8" title={t('cancel_scheduled_send')}>
+              <X className="w-4 h-4" />
+              <span className="hidden sm:inline text-sm">{t('cancel_scheduled_send')}</span>
+            </Button>
+            <Button
+              variant="ghost"
+              size="sm"
+              onClick={() => {
+                const delayedUntil = promptForRescheduleDelayedUntil();
+                if (delayedUntil) onRescheduleScheduled?.(delayedUntil);
+              }}
+              className="hidden sm:flex sm:h-8"
+              title={t('reschedule_send')}
+            >
+              <CalendarClock className="w-4 h-4" />
+              {showToolbarLabels && <span className="hidden sm:inline text-sm">{t('reschedule_send')}</span>}
+            </Button>
+            <Button variant="ghost" size="sm" onClick={onCancelScheduledForEdit} className="hidden sm:flex sm:h-8" title={email.isSmimeScheduled ? t('cancel_and_compose_again') : t('cancel_and_edit')}>
+              <EditIcon className="w-4 h-4" />
+              {showToolbarLabels && <span className="hidden sm:inline text-sm">{email.isSmimeScheduled ? t('cancel_and_compose_again') : t('cancel_and_edit')}</span>}
+            </Button>
+          </>
+        )}
+        {!isScheduled && isDraft && onEditDraft && (
           <Button
             variant="default"
             size="sm"
@@ -3307,7 +3534,7 @@ export function EmailViewer({
             <span className="text-sm">{t('edit_draft')}</span>
           </Button>
         )}
-        {!isDraft && (<>
+        {!isScheduled && !isDraft && (<>
         <Button
           variant="ghost"
           size="sm"
@@ -3349,6 +3576,7 @@ export function EmailViewer({
       </div>
 
       {/* Right: Organize actions - order: archive, delete, move, tag, spam, read state, print, view source */}
+      {!isScheduled && (
       <div className="flex items-center gap-0 sm:gap-0.5">
         {/* Archive */}
         <Button
@@ -3806,6 +4034,7 @@ export function EmailViewer({
           )}
         </div>
       </div>
+      )}
     </>
   );
 
@@ -3816,13 +4045,13 @@ export function EmailViewer({
       className={cn("flex-1 flex flex-row h-full bg-background overflow-hidden animate-in fade-in duration-300 relative", className)}
     >
     {/* Mobile More menu sidebar overlay */}
-    {isMobile && moreMenuOpen && (
+    {!isScheduled && isMobile && moreMenuOpen && (
       <div
         className="fixed inset-0 bg-black/50 z-[60] sm:hidden"
         onClick={() => setMoreMenuOpen(false)}
       />
     )}
-    {isMobile && (
+    {!isScheduled && isMobile && (
       <div className={cn(
         "fixed inset-y-0 right-0 w-72 bg-background border-l border-border z-[70] sm:hidden",
         "transform transition-transform duration-300 ease-in-out",
@@ -3997,8 +4226,8 @@ export function EmailViewer({
           "bg-background border-b border-border",
           "max-lg:sticky max-lg:top-0 max-lg:z-10"
         )}>
-          <div className="px-2 sm:px-4 lg:px-6 py-1 sm:py-2">
+          <div className="px-2 sm:px-4 lg:px-6 h-14 flex items-center">
-            <div ref={toolbarRef} className="flex items-center justify-between gap-0.5 sm:gap-2">
+            <div ref={toolbarRef} className="flex items-center justify-between gap-0.5 sm:gap-2 w-full">
               {renderToolbarItems(true)}
             </div>
           </div>
@@ -4209,7 +4438,7 @@ export function EmailViewer({
                     const opensPreview = isPreviewable && mailAttachmentAction === 'preview';
                     const thumbUrl = imageThumbUrls[attachment.id];
                     return (
-                      <DraggableAttachmentChip key={attachment.id} attachment={attachment} client={client} enabled={dragOutActive}>
+                      <DraggableAttachmentChip key={attachment.id} attachment={attachment} client={client} enabled={dragOutActive} downloadName={resolveAttachmentName(attachment)}>
                         {(dragProps) => (
                       <div
                         className={cn(
@@ -4289,7 +4518,7 @@ export function EmailViewer({
                           const isPreviewable = isFilePreviewable(attachment.name || undefined, attachment.type);
                           const opensPreview = isPreviewable && mailAttachmentAction === 'preview';
                           return (
-                            <DraggableAttachmentChip key={attachment.id} attachment={attachment} client={client} enabled={dragOutActive}>
+                            <DraggableAttachmentChip key={attachment.id} attachment={attachment} client={client} enabled={dragOutActive} downloadName={resolveAttachmentName(attachment)}>
                               {(dragProps) => (
                             <div
                               className="flex items-center gap-1.5 px-2 py-1 rounded-md hover:bg-muted/60 group relative cursor-pointer w-full"
@@ -4588,9 +4817,27 @@ export function EmailViewer({
                   <section className="min-w-0">
                     <SectionHeader>{t('details.authentication_security')}</SectionHeader>
                     <div className="flex flex-wrap gap-1.5">
-                      {auth?.spf && (
+                      {auth?.spf && (() => {
-                        <AuthChip name="SPF" result={auth.spf.result} extra={auth.spf.domain} tooltip={t('authentication.tooltip_spf')} />
+                        // When multiple identities (HELO + MAIL FROM) were
-                      )}
+                        // evaluated, list each result in the tooltip for full
+                        // transparency; the chip itself shows the most severe.
+                        const breakdown = auth.spf.all && auth.spf.all.length > 1
+                          ? auth.spf.all
+                              .map((r) => {
+                                const label = r.identity === 'mailfrom' ? 'MAIL FROM' : r.identity === 'helo' ? 'HELO' : 'SPF';
+                                return `${label}: ${translateAuthResult(r.result)}${r.domain ? ` (${r.domain})` : ''}`;
+                              })
+                              .join('\n')
+                          : null;
+                        return (
+                          <AuthChip
+                            name="SPF"
+                            result={auth.spf.result}
+                            extra={auth.spf.domain}
+                            tooltip={breakdown ? `${t('authentication.tooltip_spf')}\n\n${breakdown}` : t('authentication.tooltip_spf')}
+                          />
+                        );
+                      })()}
                       {auth?.dkim && (
                         <AuthChip name="DKIM" result={auth.dkim.result} extra={auth.dkim.domain} tooltip={t('authentication.tooltip_dkim')} />
                       )}
@@ -4754,10 +5001,44 @@ export function EmailViewer({
           </div>
         )}
 
+        {/* Scheduled Banner */}
+        {isScheduled && (
+          <div className="border-b border-border bg-primary/10">
+            <div className="max-w-4xl mx-auto px-6 py-2.5 flex flex-wrap items-center justify-between gap-2">
+              <div className="flex items-center gap-2 text-primary">
+                <CalendarClock className="w-4 h-4" />
+                <span className="text-sm font-medium">
+                  {t('scheduled_banner', { date: email.scheduledSendAt ? formatDateTime(email.scheduledSendAt, timeFormat) : '' })}
+                </span>
+              </div>
+              <div className="flex items-center gap-2">
+                {canCancelScheduled && (
+                  <>
+                    <Button size="sm" variant="outline" onClick={onCancelScheduled}>{t('cancel_scheduled_send')}</Button>
+                    <Button
+                      size="sm"
+                      variant="outline"
+                      onClick={() => {
+                        const delayedUntil = promptForRescheduleDelayedUntil();
+                        if (delayedUntil) onRescheduleScheduled?.(delayedUntil);
+                      }}
+                    >
+                      {t('reschedule_send')}
+                    </Button>
+                    <Button size="sm" variant="outline" onClick={onCancelScheduledForEdit}>
+                      {email.isSmimeScheduled ? t('cancel_and_compose_again') : t('cancel_and_edit')}
+                    </Button>
+                  </>
+                )}
+              </div>
+            </div>
+          </div>
+        )}
+
         {/* Draft Banner */}
         {isDraft && (
           <div className="border-b border-border bg-warning/10">
-            <div className="max-w-4xl mx-auto px-6 py-2.5 flex items-center justify-between">
+            <div className="px-6 py-2.5 flex items-center justify-between">
               <div className="flex items-center gap-2 text-warning">
                 <File className="w-4 h-4" />
                 <span className="text-sm font-medium">{t('draft_banner')}</span>
@@ -4789,9 +5070,10 @@ export function EmailViewer({
           error={smimeUnlockError}
         />
 
-        {/* Unified Notification Banner - External Content + Calendar Invitation */}
+        {/* Unified Notification Banner - External Content + Calendar Invitation + Read Receipt */}
         {((hasBlockedContent && !allowExternalContent && externalContentPolicy !== 'allow') ||
-          hasCalendarInvitation) && (
+          hasCalendarInvitation ||
+          (readReceiptResponse === 'ask' && shouldOfferReadReceipt)) && (
           <div className="border-b border-border bg-muted/30 isolate">
             <div className="px-6 py-1.5">
               <div className="flex flex-col gap-3 isolate">
@@ -4846,6 +5128,17 @@ export function EmailViewer({
 
 
 
+                {/* Read-receipt (MDN) request banner — only in "ask" mode */}
+                {readReceiptResponse === 'ask' && shouldOfferReadReceipt && readReceiptRequestedBy && (
+                  <div className="py-1">
+                    <ReadReceiptBanner
+                      requestedBy={readReceiptRequestedBy}
+                      onSend={() => sendReadReceiptNow(false)}
+                      onIgnore={ignoreReadReceipt}
+                    />
+                  </div>
+                )}
+
                 {/* Calendar Invitation Banner */}
                 {hasCalendarInvitation && (
                   <div className="py-1">
@@ -4908,7 +5201,7 @@ export function EmailViewer({
               const opensPreview = isPreviewable && mailAttachmentAction === 'preview';
               const thumbUrl = imageThumbUrls[attachment.id];
               return (
-                <DraggableAttachmentChip key={attachment.id} attachment={attachment} client={client} enabled={dragOutActive}>
+                <DraggableAttachmentChip key={attachment.id} attachment={attachment} client={client} enabled={dragOutActive} downloadName={resolveAttachmentName(attachment)}>
                   {(dragProps) => (
                 <div
                   className={cn(
@@ -4993,7 +5286,7 @@ export function EmailViewer({
                     const isPreviewable = isFilePreviewable(attachment.name || undefined, attachment.type);
                     const opensPreview = isPreviewable && mailAttachmentAction === 'preview';
                     return (
-                      <DraggableAttachmentChip key={attachment.id} attachment={attachment} client={client} enabled={dragOutActive}>
+                      <DraggableAttachmentChip key={attachment.id} attachment={attachment} client={client} enabled={dragOutActive} downloadName={resolveAttachmentName(attachment)}>
                         {(dragProps) => (
                       <div
                         className="flex items-center gap-1.5 px-2 py-1 rounded-md hover:bg-muted/60 group relative cursor-pointer w-full"
@@ -5051,7 +5344,7 @@ export function EmailViewer({
                 const opensPreview = isPreviewable && mailAttachmentAction === 'preview';
                 const thumbUrl = imageThumbUrls[attachment.id];
                 return (
-                  <DraggableAttachmentChip key={attachment.id} attachment={attachment} client={client} enabled={dragOutActive}>
+                  <DraggableAttachmentChip key={attachment.id} attachment={attachment} client={client} enabled={dragOutActive} downloadName={resolveAttachmentName(attachment)}>
                     {(dragProps) => (
                   <div
                     className={cn(
@@ -5130,7 +5423,7 @@ export function EmailViewer({
                       const isPreviewable = isFilePreviewable(attachment.name || undefined, attachment.type);
                       const opensPreview = isPreviewable && mailAttachmentAction === 'preview';
                       return (
-                        <DraggableAttachmentChip key={attachment.id} attachment={attachment} client={client} enabled={dragOutActive}>
+                        <DraggableAttachmentChip key={attachment.id} attachment={attachment} client={client} enabled={dragOutActive} downloadName={resolveAttachmentName(attachment)}>
                           {(dragProps) => (
                         <div
                           className="flex items-center gap-1.5 px-2 py-1 rounded-md hover:bg-muted/60 group relative cursor-pointer w-full"
@@ -5226,14 +5519,16 @@ export function EmailViewer({
           <PluginSlot name="email-footer" />
 
           {/* Quick Reply Section - hidden for drafts and while loading a new email */}
-          {!isDraft && !isBodyLoading && (effectiveEmailContent.isHtml ? iframeReady : true) && (<div className="bg-background border-t border-border px-6 mt-auto" style={{ paddingBlock: 'var(--density-header-py)' }}>
+          {!isDraft && !isScheduled && !isBodyLoading && (effectiveEmailContent.isHtml ? iframeReady : true) && (<div className="bg-background border-t border-border px-6 mt-auto" style={{ paddingBlock: 'var(--density-header-py)' }}>
             <div className="flex items-start" style={{ gap: 'var(--density-item-gap)' }}>
               <div className="flex-shrink-0">
                 <Avatar
-                  name={currentUserName || "You"}
+                  name={activeAccount?.displayName || currentUserName || "You"}
-                  email={currentUserEmail || ""}
+                  email={activeAccount?.email || activeAccount?.username || currentUserEmail || ""}
                   size="lg"
                   className="shadow-sm w-10 h-10"
+                  disableFavicon
+                  fallbackColor={activeAccount?.avatarColor}
                 />
               </div>
               <div className="flex-1 min-w-0 space-y-3">

components/email/quoted-html.ts

@@ -0,0 +1,187 @@
+"use client";
+
+import { Node as TiptapNode, mergeAttributes } from "@tiptap/core";
+import { DOMSerializer } from "@tiptap/pm/model";
+import type { Editor } from "@tiptap/react";
+
+// Marker attribute that identifies the quoted-original wrapper in serialized
+// HTML, so parseHTML can recognise it on the way back in.
+export const QUOTED_HTML_MARKER = "data-quoted-html";
+
+/**
+ * QuotedHtml — an atomic block node that carries the *verbatim* HTML of a
+ * quoted/forwarded original email. The HTML is stored in the `html` attribute
+ * and is NEVER parsed into the ProseMirror schema, so layout-heavy emails
+ * (nested tables, MJML, Outlook divs) survive a reply/forward 1:1.
+ *
+ * Behaviour:
+ *  - To ProseMirror it's a single atomic block: Backspace at the boundary or
+ *    Ctrl+A + Delete removes the whole quote in one go ("wie es sich gehört").
+ *  - Its NodeView renders an inner `contentEditable` region so the user can
+ *    still redact text inside the quote. Inner edits are synced back into the
+ *    `html` attribute (without polluting the undo history).
+ *
+ * Serialization: ProseMirror's DOM serializer can't emit an atom's inner raw
+ * HTML, so use `serializeEditorContent(editor)` (below) instead of
+ * `editor.getHTML()` to read the composer body for sending/draft-saving.
+ */
+export const QuotedHtml = TiptapNode.create({
+  name: "quotedHtml",
+  group: "block",
+  atom: true,
+  selectable: true,
+  draggable: false,
+  // Isolating keeps selection/gapcursor behaviour sane at the boundary.
+  isolating: true,
+
+  addAttributes() {
+    return {
+      html: {
+        default: "",
+        // Capture the verbatim inner HTML when parsing. Because the node is
+        // an atom, ProseMirror does NOT descend into the children, so they
+        // never hit the schema.
+        parseHTML: (el) => el.innerHTML,
+        // Not rendered as an attribute - the real content round-trips via the
+        // custom serializer. renderHTML below only needs the wrapper.
+        renderHTML: () => ({}),
+      },
+    };
+  },
+
+  parseHTML() {
+    return [{ tag: `div[${QUOTED_HTML_MARKER}]` }];
+  },
+
+  renderHTML({ HTMLAttributes }) {
+    // Only used for ProseMirror's internal/clipboard round-trip. The send /
+    // draft path uses serializeEditorContent() which inlines attrs.html.
+    return ["div", mergeAttributes(HTMLAttributes, { [QUOTED_HTML_MARKER]: "" })];
+  },
+
+  addNodeView() {
+    return ({ node, editor, getPos }) => {
+      // Host element ProseMirror manages. A subtle left border echoes the
+      // classic email quote bar without touching the quoted content's styling.
+      const dom = document.createElement("div");
+      dom.setAttribute(QUOTED_HTML_MARKER, "");
+      dom.className = "quoted-html-island";
+      dom.style.cssText =
+        "border-left:2px solid #c5c5c5;padding-left:12px;margin-top:8px;";
+
+      // CRITICAL: render the quoted email inside a Shadow Root. The app's
+      // global CSS (Tailwind preflight, .tiptap table/td rules, box-sizing
+      // resets) would otherwise cascade INTO the quote and destroy its layout
+      // - even though the verbatim HTML serializes/sends perfectly. Shadow DOM
+      // isolates both directions: only the browser's UA defaults + the email's
+      // own inline styles apply, so the in-editor rendering matches the sent
+      // mail 1:1.
+      const shadow = dom.attachShadow({ mode: "open" });
+      const inner = document.createElement("div");
+      inner.contentEditable = "true";
+      inner.style.cssText = "outline:none;";
+      inner.innerHTML = node.attrs.html || "";
+      shadow.appendChild(inner);
+
+      // Track focus via focusin/focusout: inside a shadow root,
+      // document.activeElement is retargeted to the host, so we can't rely on
+      // it to detect "is the user editing in here".
+      let focused = false;
+      inner.addEventListener("focusin", () => {
+        focused = true;
+      });
+      inner.addEventListener("focusout", () => {
+        focused = false;
+      });
+
+      // Sync inner edits back into the node attribute. Coalesced via rAF so a
+      // burst of keystrokes is one transaction; addToHistory:false keeps
+      // redaction edits out of the editor's undo stack. The `input` event is
+      // composed and crosses the shadow boundary, so this listener fires.
+      let frame = 0;
+      const syncBack = () => {
+        cancelAnimationFrame(frame);
+        frame = requestAnimationFrame(() => {
+          if (typeof getPos !== "function") return;
+          const pos = getPos();
+          if (pos == null) return;
+          const current = inner.innerHTML;
+          if (current === node.attrs.html) return;
+          editor.view.dispatch(
+            editor.view.state.tr
+              .setNodeAttribute(pos, "html", current)
+              .setMeta("addToHistory", false)
+          );
+        });
+      };
+      inner.addEventListener("input", syncBack);
+
+      return {
+        dom,
+        // ProseMirror must not try to reconcile the foreign shadow content.
+        ignoreMutation: () => true,
+        // Events originating inside the island are retargeted to the host
+        // (`dom`) once they cross the shadow boundary, so dom.contains(target)
+        // is true for them → let the native shadow contentEditable handle
+        // them. Events from the surrounding doc (boundary Backspace,
+        // Ctrl+A+Delete) target other elements → fall through to ProseMirror
+        // so whole-block deletion still works.
+        stopEvent: (event) => {
+          const target = event.target as Node | null;
+          return !!target && dom.contains(target);
+        },
+        update: (updatedNode) => {
+          if (updatedNode.type.name !== "quotedHtml") return false;
+          // Don't clobber the caret while the user is redacting inside.
+          if (!focused && inner.innerHTML !== updatedNode.attrs.html) {
+            inner.innerHTML = updatedNode.attrs.html || "";
+          }
+          return true;
+        },
+        destroy: () => {
+          cancelAnimationFrame(frame);
+          inner.removeEventListener("input", syncBack);
+        },
+      };
+    };
+  },
+});
+
+/**
+ * Serialize the composer document to HTML for sending / draft-saving.
+ *
+ * Use this INSTEAD of `editor.getHTML()`: ProseMirror's DOM serializer cannot
+ * emit the raw inner HTML of an atom node, so it would drop the quoted body.
+ * Here we walk the top-level nodes, inline the quote node's verbatim `html`,
+ * and serialize everything else normally.
+ */
+export function serializeEditorContent(editor: Editor): string {
+  const serializer = DOMSerializer.fromSchema(editor.schema);
+  const parts: string[] = [];
+  editor.state.doc.forEach((node) => {
+    if (node.type.name === "quotedHtml") {
+      // Emit the SAME wrapper buildQuotedHtmlBlock produces, so a saved draft
+      // round-trips: re-opening parses this back into a QuotedHtml node
+      // instead of letting the schema mangle the raw table layout again.
+      parts.push(buildQuotedHtmlBlock((node.attrs.html as string) || ""));
+      return;
+    }
+    const fragment = serializer.serializeNode(node);
+    const tmp = document.createElement("div");
+    tmp.appendChild(fragment);
+    parts.push(tmp.innerHTML);
+  });
+  return parts.join("");
+}
+
+/**
+ * Build the editor-content wrapper that the composer prepends/appends so the
+ * quoted original becomes a single QuotedHtml node. The inner HTML must be
+ * pre-sanitized (scripts/styles/head stripped, cid: images rewritten).
+ *
+ * The `data-quoted-html` marker is what parseHTML keys on, so this exact form
+ * must be what serializeEditorContent emits too (round-trip consistency).
+ */
+export function buildQuotedHtmlBlock(sanitizedInnerHtml: string): string {
+  return `<div ${QUOTED_HTML_MARKER}>${sanitizedInnerHtml}</div>`;
+}

components/email/read-receipt-banner.tsx

@@ -0,0 +1,60 @@
+'use client';
+
+import { useState } from 'react';
+import { MailCheck, Loader2, CheckCircle } from 'lucide-react';
+import { useTranslations } from 'next-intl';
+
+interface ReadReceiptBannerProps {
+  /** Address that requested the receipt (Disposition-Notification-To). */
+  requestedBy: string;
+  /** Sends the MDN. Should resolve when the receipt has been submitted. */
+  onSend: () => Promise<void>;
+  /** Suppresses the request without sending (sets $MDNSent server-side). */
+  onIgnore: () => void;
+}
+
+export function ReadReceiptBanner({ requestedBy, onSend, onIgnore }: ReadReceiptBannerProps) {
+  const t = useTranslations('email_viewer.read_receipt');
+  const [state, setState] = useState<'idle' | 'sending' | 'sent'>('idle');
+
+  if (state === 'sent') {
+    return (
+      <div className="flex items-center gap-2 rounded-md border border-border bg-muted/40 px-3 py-2 text-sm text-muted-foreground">
+        <CheckCircle className="w-4 h-4 text-green-600 dark:text-green-400 shrink-0" />
+        <span>{t('sent')}</span>
+      </div>
+    );
+  }
+
+  return (
+    <div className="flex flex-wrap items-center gap-2 rounded-md border border-amber-300/60 bg-amber-50 px-3 py-2 text-sm dark:border-amber-700/50 dark:bg-amber-950/30">
+      <MailCheck className="w-4 h-4 shrink-0 text-amber-600 dark:text-amber-400" />
+      <span className="text-foreground">{t('prompt')}</span>
+      <span className="break-all text-muted-foreground">{requestedBy}</span>
+      <div className="ml-auto flex items-center gap-2">
+        <button
+          onClick={async () => {
+            setState('sending');
+            try {
+              await onSend();
+              setState('sent');
+            } catch {
+              setState('idle');
+            }
+          }}
+          disabled={state === 'sending'}
+          className="inline-flex items-center gap-1.5 rounded-md bg-green-600 px-3 py-1.5 text-xs font-medium text-white transition-colors hover:bg-green-700 disabled:cursor-not-allowed disabled:opacity-50"
+        >
+          {state === 'sending' && <Loader2 className="w-3 h-3 animate-spin" />}
+          {t('send')}
+        </button>
+        <button
+          onClick={onIgnore}
+          className="rounded-md bg-red-600 px-3 py-1.5 text-xs font-medium text-white transition-colors hover:bg-red-700"
+        >
+          {t('ignore')}
+        </button>
+      </div>
+    </div>
+  );
+}

components/email/rich-text-editor.tsx

@@ -16,6 +16,7 @@ import { Table } from "@tiptap/extension-table";
 import { TableRow } from "@tiptap/extension-table-row";
 import { TableHeader } from "@tiptap/extension-table-header";
 import { TableCell } from "@tiptap/extension-table-cell";
+import { QuotedHtml, serializeEditorContent } from "@/components/email/quoted-html";
 import { cn } from "@/lib/utils";
 import {
   Bold,
@@ -231,6 +232,9 @@ export function RichTextEditor({
           style: "padding:6px 8px;border:1px solid #ccc;vertical-align:top;",
         },
       }),
+      // Quoted/forwarded original email body - held verbatim as an atomic
+      // node so layout-heavy HTML survives 1:1 (see quoted-html.ts).
+      QuotedHtml,
     ],
     content,
     editorProps: {
@@ -281,14 +285,18 @@ export function RichTextEditor({
       },
     },
     onUpdate: ({ editor }) => {
-      onChange(editor.getHTML());
+      // serializeEditorContent (not getHTML) so the verbatim quoted-original
+      // HTML held in the QuotedHtml atom node is emitted intact.
+      onChange(serializeEditorContent(editor));
     },
     immediatelyRender: false,
   });
 
-  // Sync external content changes (e.g. template application)
+  // Sync external content changes (e.g. template application). Compare against
+  // the custom serialization so a doc that only differs inside a QuotedHtml
+  // island isn't needlessly re-parsed (which would reset the island DOM).
   useEffect(() => {
-    if (editor && content !== editor.getHTML()) {
+    if (editor && content !== serializeEditorContent(editor)) {
       editor.commands.setContent(content, { emitUpdate: false });
     }
   }, [content, editor]);

components/email/thread-list-item.tsx

@@ -1,11 +1,11 @@
 "use client";
 
 import React, { useCallback } from "react";
-import { formatDate, stripInvisibleLeading } from "@/lib/utils";
+import { formatDate, formatDateTime, stripInvisibleLeading } from "@/lib/utils";
 import { Email, ThreadGroup } from "@/lib/jmap/types";
 import { cn } from "@/lib/utils";
 import { Avatar } from "@/components/ui/avatar";
-import { Paperclip, Star, Circle, ChevronRight, ChevronDown, Loader2, MessageSquare, CheckSquare, Square, Reply, Forward } from "lucide-react";
+import { Paperclip, Star, Circle, ChevronRight, ChevronDown, Loader2, MessageSquare, CheckSquare, Square, Reply, Forward, CalendarClock } from "lucide-react";
 import { useSettingsStore, KEYWORD_PALETTE } from "@/stores/settings-store";
 import { useUIStore } from "@/stores/ui-store";
 import { useEmailStore } from "@/stores/email-store";
@@ -67,15 +67,21 @@ const SingleEmailItem = React.forwardRef<HTMLDivElement, SingleEmailItemProps>(
     const emailKeywords = useSettingsStore((state) => state.emailKeywords);
     const density = useSettingsStore((state) => state.density);
     const mailLayout = useSettingsStore((state) => state.mailLayout);
+    const timeFormat = useSettingsStore((state) => state.timeFormat);
     const showAvatarsInJunk = useSettingsStore((state) => state.showAvatarsInJunk);
     const hideJunkAvatarImages = currentMailboxRole === 'junk' && !showAvatarsInJunk;
     const isUnifiedView = useEmailStore((state) => state.isUnifiedView);
     const getAccountById = useAccountStore((state) => state.getAccountById);
     const accountColor = email.accountId ? getAccountById(email.accountId)?.avatarColor : undefined;
     const isChecked = selectedEmailIds.has(email.id);
-    const isFocusedMailLayout = mailLayout === 'focus';
+    const isMobile = useUIStore((state) => state.isMobile);
+    // The horizontal one-line "focus" layout doesn't fit on narrow screens; fall back to multi-line on mobile.
+    const isFocusedMailLayout = mailLayout === 'focus' && !isMobile;
     const trimmedPreview = stripInvisibleLeading(email.preview ?? '');
     const inlinePreview = showPreview && trimmedPreview ? ` ${trimmedPreview}` : '';
+    const scheduledSendLabel = email.isScheduled && email.scheduledSendAt
+      ? formatDateTime(email.scheduledSendAt, timeFormat)
+      : null;
 
     // Resolve color tags using keyword definitions; unknown tags fall back to gray
     const tagIds = getEmailColorTags(email.keywords);
@@ -91,8 +97,6 @@ const SingleEmailItem = React.forwardRef<HTMLDivElement, SingleEmailItemProps>(
       sourceMailboxId: selectedMailbox,
     });
 
-    const isMobile = useUIStore((state) => state.isMobile);
-
     const { onTouchStart, onTouchEnd, onTouchMove, onTouchCancel, isPressed } = useLongPress(
       useCallback((pos) => {
         onContextMenu?.(
@@ -241,12 +245,22 @@ const SingleEmailItem = React.forwardRef<HTMLDivElement, SingleEmailItemProps>(
                   {resolvedKeywordDefs.map((kd) => (
                     <span key={kd.id} className={cn('h-2.5 w-2.5 rounded-full', KEYWORD_PALETTE[kd.color]?.dot || 'bg-gray-400')} />
                   ))}
-                  <span className={cn(
+                  {scheduledSendLabel ? (
-                    'text-xs tabular-nums',
+                    <span
-                    isUnread ? 'text-foreground font-semibold' : 'text-muted-foreground'
+                      className="inline-flex max-w-[11rem] shrink-0 items-center gap-1 truncate rounded-full border border-sky-500/20 bg-sky-500/10 px-2 py-0.5 text-xs font-medium tabular-nums text-sky-700 dark:text-sky-300"
-                  )}>
+                      title={scheduledSendLabel}
-                    {formatDate(email.receivedAt)}
+                    >
-                  </span>
+                      <CalendarClock className="h-3 w-3 shrink-0" />
+                      <span className="truncate">{scheduledSendLabel}</span>
+                    </span>
+                  ) : (
+                    <span className={cn(
+                      'text-xs tabular-nums',
+                      isUnread ? 'text-foreground font-semibold' : 'text-muted-foreground'
+                    )}>
+                      {formatDate(email.receivedAt)}
+                    </span>
+                  )}
                 </div>
               </div>
             ) : (
@@ -299,14 +313,24 @@ const SingleEmailItem = React.forwardRef<HTMLDivElement, SingleEmailItemProps>(
                         {kd.label}
                       </span>
                     ))}
-                    <span className={cn(
+                    {scheduledSendLabel ? (
-                      "text-xs tabular-nums",
+                      <span
-                      isUnread
+                        className="inline-flex max-w-[11rem] shrink-0 items-center gap-1 truncate rounded-full border border-sky-500/20 bg-sky-500/10 px-2 py-0.5 text-[11px] font-medium tabular-nums text-sky-700 dark:text-sky-300"
-                        ? "text-foreground font-semibold"
+                        title={scheduledSendLabel}
-                        : "text-muted-foreground"
+                      >
-                    )}>
+                        <CalendarClock className="h-3 w-3 shrink-0" />
-                      {formatDate(email.receivedAt)}
+                        <span className="truncate">{scheduledSendLabel}</span>
-                    </span>
+                      </span>
+                    ) : (
+                      <span className={cn(
+                        "text-xs tabular-nums",
+                        isUnread
+                          ? "text-foreground font-semibold"
+                          : "text-muted-foreground"
+                      )}>
+                        {formatDate(email.receivedAt)}
+                      </span>
+                    )}
                   </div>
                 </div>
 
@@ -335,16 +359,18 @@ const SingleEmailItem = React.forwardRef<HTMLDivElement, SingleEmailItemProps>(
         </div>
 
         {/* Hover Quick Actions */}
-        <EmailHoverActions
+        {!email.isScheduled && (
-          email={email}
+          <EmailHoverActions
-          backgroundClassName={resolvedColorTag ? resolvedColorTag : ((selected || isChecked) ? "bg-accent" : "bg-muted")}
+            email={email}
-          onToggleStar={onToggleStar}
+            backgroundClassName={resolvedColorTag ? resolvedColorTag : ((selected || isChecked) ? "bg-accent" : "bg-muted")}
-          onMarkAsRead={onMarkAsRead}
+            onToggleStar={onToggleStar}
-          onDelete={onDelete}
+            onMarkAsRead={onMarkAsRead}
-          onArchive={onArchive}
+            onDelete={onDelete}
-          onSetColorTag={onSetColorTag}
+            onArchive={onArchive}
-          onMarkAsSpam={onMarkAsSpam}
+            onSetColorTag={onSetColorTag}
-        />
+            onMarkAsSpam={onMarkAsSpam}
+          />
+        )}
       </div>
     );
   }
@@ -374,12 +400,17 @@ export const ThreadListItem = React.forwardRef<HTMLDivElement, ThreadListItemPro
     const showPreview = useSettingsStore((state) => state.showPreview);
     const density = useSettingsStore((state) => state.density);
     const mailLayout = useSettingsStore((state) => state.mailLayout);
+    const timeFormat = useSettingsStore((state) => state.timeFormat);
     const showAvatarsInJunk = useSettingsStore((state) => state.showAvatarsInJunk);
     const isMobile = useUIStore((state) => state.isMobile);
     const { latestEmail, participantNames, hasUnread, hasStarred, hasAttachment, hasAnswered, hasForwarded, emailCount } = thread;
-    const isFocusedMailLayout = mailLayout === 'focus';
+    // The horizontal one-line "focus" layout doesn't fit on narrow screens; fall back to multi-line on mobile.
+    const isFocusedMailLayout = mailLayout === 'focus' && !isMobile;
     const trimmedPreview = stripInvisibleLeading(latestEmail.preview ?? '');
     const inlinePreview = showPreview && trimmedPreview ? ` ${trimmedPreview}` : '';
+    const scheduledSendLabel = latestEmail.isScheduled && latestEmail.scheduledSendAt
+      ? formatDateTime(latestEmail.scheduledSendAt, timeFormat)
+      : null;
 
     const { selectedMailbox, mailboxes, selectedEmailIds, toggleEmailSelection, selectRangeEmails, clearSelection, isUnifiedView } = useEmailStore();
     const getAccountById = useAccountStore((state) => state.getAccountById);
@@ -645,12 +676,22 @@ export const ThreadListItem = React.forwardRef<HTMLDivElement, ThreadListItemPro
                     {keywordDef && (
                       <span className={cn('h-2.5 w-2.5 rounded-full', KEYWORD_PALETTE[keywordDef.color]?.dot || 'bg-gray-400')} />
                     )}
-                    <span className={cn(
+                    {scheduledSendLabel ? (
-                      'text-xs tabular-nums',
+                      <span
-                      hasUnread ? 'text-foreground font-semibold' : 'text-muted-foreground'
+                        className="inline-flex max-w-[11rem] shrink-0 items-center gap-1 truncate rounded-full border border-sky-500/20 bg-sky-500/10 px-2 py-0.5 text-xs font-medium tabular-nums text-sky-700 dark:text-sky-300"
-                    )}>
+                        title={scheduledSendLabel}
-                      {formatDate(latestEmail.receivedAt)}
+                      >
-                    </span>
+                        <CalendarClock className="h-3 w-3 shrink-0" />
+                        <span className="truncate">{scheduledSendLabel}</span>
+                      </span>
+                    ) : (
+                      <span className={cn(
+                        'text-xs tabular-nums',
+                        hasUnread ? 'text-foreground font-semibold' : 'text-muted-foreground'
+                      )}>
+                        {formatDate(latestEmail.receivedAt)}
+                      </span>
+                    )}
                   </div>
                 </div>
               ) : (
@@ -715,14 +756,24 @@ export const ThreadListItem = React.forwardRef<HTMLDivElement, ThreadListItemPro
                           {keywordDef.label}
                         </span>
                       )}
-                      <span className={cn(
+                      {scheduledSendLabel ? (
-                        "text-xs tabular-nums",
+                        <span
-                        hasUnread
+                          className="inline-flex max-w-[11rem] shrink-0 items-center gap-1 truncate rounded-full border border-sky-500/20 bg-sky-500/10 px-2 py-0.5 text-[11px] font-medium tabular-nums text-sky-700 dark:text-sky-300"
-                          ? "text-foreground font-semibold"
+                          title={scheduledSendLabel}
-                          : "text-muted-foreground"
+                        >
-                      )}>
+                          <CalendarClock className="h-3 w-3 shrink-0" />
-                        {formatDate(latestEmail.receivedAt)}
+                          <span className="truncate">{scheduledSendLabel}</span>
-                      </span>
+                        </span>
+                      ) : (
+                        <span className={cn(
+                          "text-xs tabular-nums",
+                          hasUnread
+                            ? "text-foreground font-semibold"
+                            : "text-muted-foreground"
+                        )}>
+                          {formatDate(latestEmail.receivedAt)}
+                        </span>
+                      )}
                     </div>
                   </div>
 
@@ -751,16 +802,18 @@ export const ThreadListItem = React.forwardRef<HTMLDivElement, ThreadListItemPro
           </div>
 
           {/* Hover Quick Actions for thread header */}
-          <EmailHoverActions
+          {!latestEmail.isScheduled && (
-            email={latestEmail}
+            <EmailHoverActions
-            backgroundClassName={colorTag ? colorTag : ((isSelected || isChecked) ? "bg-accent" : "bg-muted")}
+              email={latestEmail}
-            onToggleStar={onToggleStar ? () => onToggleStar(latestEmail) : undefined}
+              backgroundClassName={colorTag ? colorTag : ((isSelected || isChecked) ? "bg-accent" : "bg-muted")}
-            onMarkAsRead={onMarkAsRead ? (read) => onMarkAsRead(latestEmail, read) : undefined}
+              onToggleStar={onToggleStar ? () => onToggleStar(latestEmail) : undefined}
-            onDelete={onDelete ? () => onDelete(latestEmail) : undefined}
+              onMarkAsRead={onMarkAsRead ? (read) => onMarkAsRead(latestEmail, read) : undefined}
-            onArchive={onArchive ? () => onArchive(latestEmail) : undefined}
+              onDelete={onDelete ? () => onDelete(latestEmail) : undefined}
-            onSetColorTag={onSetColorTag ? (color) => onSetColorTag(latestEmail.id, color) : undefined}
+              onArchive={onArchive ? () => onArchive(latestEmail) : undefined}
-            onMarkAsSpam={onMarkAsSpam ? () => onMarkAsSpam(latestEmail) : undefined}
+              onSetColorTag={onSetColorTag ? (color) => onSetColorTag(latestEmail.id, color) : undefined}
-          />
+              onMarkAsSpam={onMarkAsSpam ? () => onMarkAsSpam(latestEmail) : undefined}
+            />
+          )}
         </div>
 
         {isExpanded && !isMobile && !isFocusedMailLayout && (

components/files/eml-preview.tsx

@@ -0,0 +1,110 @@
+"use client";
+
+import { useTranslations } from "next-intl";
+import { Paperclip, Download } from "lucide-react";
+import { sanitizeEmailHtmlForIframe } from "@/lib/email-sanitization";
+
+// A parsed message/rfc822 (.eml), as produced by postal-mime. Only the fields
+// this preview renders are typed.
+export type ParsedEml = {
+  subject?: string;
+  from?: { name?: string; address?: string };
+  to?: Array<{ name?: string; address?: string }>;
+  date?: string;
+  html?: string;
+  text?: string;
+  attachments?: Array<{ filename?: string; mimeType?: string; content?: ArrayBuffer | Uint8Array }>;
+};
+
+function formatAddress(a?: { name?: string; address?: string }): string {
+  if (!a) return "";
+  if (a.name && a.address) return `${a.name} <${a.address}>`;
+  return a.address || a.name || "";
+}
+
+function escapeHtml(s: string): string {
+  return s
+    .replace(/&/g, "&amp;")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;")
+    .replace(/'/g, "&#39;");
+}
+
+// Renders a .eml attachment like an email: header (from/to/subject/date) + the
+// body, plus the message's own attachments. The body is sanitized with
+// DOMPurify AND rendered in a fully-locked sandbox iframe (sandbox="" - no
+// scripts, no same-origin), so a script-bearing .eml can never execute in our
+// origin. Parsing happens in the caller (FilePreviewModal); this is pure
+// presentation.
+export function EmlPreview({ message }: { message: ParsedEml }) {
+  const t = useTranslations("email_viewer");
+
+  const bodyDoc = message.html
+    ? sanitizeEmailHtmlForIframe(message.html)
+    : message.text
+      ? `<pre style="white-space:pre-wrap;word-break:break-word;font-family:ui-monospace,monospace;margin:0;padding:8px">${escapeHtml(message.text)}</pre>`
+      : "";
+
+  const downloadAttachment = (att: NonNullable<ParsedEml["attachments"]>[number]) => {
+    if (!att.content) return;
+    // content is a real ArrayBuffer/Uint8Array at runtime; cast for the strict
+    // BlobPart lib type (Uint8Array<ArrayBufferLike> vs ArrayBuffer).
+    const url = URL.createObjectURL(new Blob([att.content as BlobPart], { type: att.mimeType || "application/octet-stream" }));
+    const a = document.createElement("a");
+    a.href = url;
+    a.download = att.filename || "attachment";
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+    URL.revokeObjectURL(url);
+  };
+
+  return (
+    <div
+      className="w-full max-w-3xl max-h-full self-start overflow-auto rounded-lg border border-border bg-background shadow-2xl p-4"
+      onClick={(e) => e.stopPropagation()}
+    >
+      <h2 className="text-lg font-semibold text-foreground break-words">{message.subject || ""}</h2>
+      <div className="mt-2 space-y-0.5 text-sm text-muted-foreground border-b border-border pb-3">
+        {message.from && (
+          <div><span className="font-medium text-foreground">{t("from")}: </span>{formatAddress(message.from)}</div>
+        )}
+        {message.to && message.to.length > 0 && (
+          <div><span className="font-medium text-foreground">{t("to")}: </span>{message.to.map(formatAddress).join(", ")}</div>
+        )}
+        {message.date && (
+          <div><span className="font-medium text-foreground">{t("date")}: </span>{new Date(message.date).toLocaleString()}</div>
+        )}
+      </div>
+      {bodyDoc && (
+        <iframe
+          title={message.subject || "email"}
+          sandbox=""
+          srcDoc={bodyDoc}
+          className="w-full min-h-[55vh] mt-3 rounded bg-white"
+        />
+      )}
+      {message.attachments && message.attachments.length > 0 && (
+        <div className="mt-4 border-t border-border pt-3">
+          <div className="text-xs font-medium text-muted-foreground mb-2">{t("attachments")}</div>
+          <div className="flex flex-wrap gap-2">
+            {message.attachments.map((att, i) => (
+              <button
+                key={i}
+                type="button"
+                onClick={() => downloadAttachment(att)}
+                title={t("download")}
+                className="flex items-center gap-2 px-3 py-1.5 rounded-md text-sm bg-muted text-foreground hover:bg-muted/70"
+              >
+                <Paperclip className="w-3 h-3 flex-shrink-0" />
+                <span className="max-w-[200px] truncate">{att.filename || "attachment"}</span>
+                <Download className="w-3 h-3 flex-shrink-0 text-muted-foreground" />
+              </button>
+            ))}
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}

components/files/file-preview-modal.tsx

@@ -1,10 +1,48 @@
 "use client";
 
-import { useState, useEffect } from "react";
+import { useState, useEffect, useRef } from "react";
 import { useTranslations } from "next-intl";
-import { X, Download, Loader2 } from "lucide-react";
+import { X, Download, Loader2, ExternalLink } from "lucide-react";
 import { Button } from "@/components/ui/button";
-import { getFilePreviewKind } from "@/lib/file-preview";
+import { getFilePreviewKind, isMimeTypeSafeForInlinePreview } from "@/lib/file-preview";
+import dynamic from "next/dynamic";
+import { EmlPreview, type ParsedEml } from "@/components/files/eml-preview";
+
+// pdf.js-based inline viewer for mobile (no native inline PDF viewer). Loaded
+// only on the mobile PDF path so pdfjs-dist + its worker never reach the
+// desktop bundle.
+const PdfMobileViewer = dynamic(
+  () => import("@/components/files/pdf-mobile-viewer").then((m) => m.PdfMobileViewer),
+  { ssr: false },
+);
+
+// Map a few well-known extensions back to canonical MIME types. Used when the
+// server returns application/octet-stream (or empty) for an attachment whose
+// actual type is obvious from the filename. The blob.type drives how browsers
+// render blob: URLs, so guessing wrong here means the inline preview silently
+// downgrades to a download.
+const EXT_TO_MIME: Record<string, string> = {
+  pdf: "application/pdf",
+  png: "image/png",
+  jpg: "image/jpeg",
+  jpeg: "image/jpeg",
+  gif: "image/gif",
+  webp: "image/webp",
+  avif: "image/avif",
+  bmp: "image/bmp",
+  mp3: "audio/mpeg",
+  wav: "audio/wav",
+  ogg: "audio/ogg",
+  m4a: "audio/mp4",
+  mp4: "video/mp4",
+  webm: "video/webm",
+  ogv: "video/ogg",
+};
+
+function inferMimeFromName(name: string): string | undefined {
+  const ext = name.toLowerCase().split(".").pop();
+  return ext ? EXT_TO_MIME[ext] : undefined;
+}
 
 interface FilePreviewModalProps {
   name: string;
@@ -111,6 +149,54 @@ export function FilePreviewModal({ name, onClose, onDownload, getFileContent }:
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState(false);
   const [resolvedFileType, setResolvedFileType] = useState(() => getFilePreviewKind(name));
+  const [pdfInlineSupported, setPdfInlineSupported] = useState(true);
+  // Whether the resolved blob MIME is inert enough to open as a top-level
+  // navigation. Blob URLs inherit our origin, so opening a script-bearing type
+  // (text/html, image/svg+xml, ...) in a new tab would execute it in-origin.
+  const [canOpenInNewTab, setCanOpenInNewTab] = useState(false);
+  const [emlContent, setEmlContent] = useState<ParsedEml | null>(null);
+
+  // Decide whether to render the PDF in a plain <iframe> (desktop) or with the
+  // pdf.js canvas viewer (mobile). navigator.pdfViewerEnabled is the standard
+  // signal and correctly reports false on Android Chrome (no inline viewer).
+  // iOS Safari is the exception: it reports true (it can show PDFs on top-frame
+  // navigation) yet renders only the FIRST page inside an <iframe> - a
+  // long-standing WebKit limitation - so it must use pdf.js too. Detect iOS
+  // (incl. iPadOS, which spoofs a "Macintosh" UA but exposes touch points).
+  useEffect(() => {
+    const nav = navigator as Navigator & { pdfViewerEnabled?: boolean };
+    const isIOS =
+      /iPad|iPhone|iPod/.test(nav.userAgent) ||
+      (nav.maxTouchPoints > 1 && /Macintosh/.test(nav.userAgent));
+    if (isIOS) {
+      setPdfInlineSupported(false);
+    } else if (typeof nav.pdfViewerEnabled === "boolean") {
+      setPdfInlineSupported(nav.pdfViewerEnabled);
+    }
+  }, []);
+
+  // Keep the latest onClose for the back-button handler without re-subscribing.
+  const onCloseRef = useRef(onClose);
+  onCloseRef.current = onClose;
+
+  // Make the Android/browser Back button close the preview instead of
+  // navigating the page underneath: push a throwaway history entry when the
+  // modal opens and close it on popstate. On a normal close (X / backdrop /
+  // Escape) the modal unmounts and we pop that entry ourselves, so the user's
+  // next Back isn't swallowed by it.
+  useEffect(() => {
+    window.history.pushState({ __filePreview: true }, "");
+    let poppedByBack = false;
+    const onPop = () => {
+      poppedByBack = true;
+      onCloseRef.current();
+    };
+    window.addEventListener("popstate", onPop);
+    return () => {
+      window.removeEventListener("popstate", onPop);
+      if (!poppedByBack) window.history.back();
+    };
+  }, []);
 
   const fileType = resolvedFileType;
 
@@ -120,6 +206,8 @@ export function FilePreviewModal({ name, onClose, onDownload, getFileContent }:
 
     setContent(null);
     setObjectUrl(null);
+    setCanOpenInNewTab(false);
+    setEmlContent(null);
     setLoading(true);
     setError(false);
     setResolvedFileType(getFilePreviewKind(name));
@@ -136,9 +224,36 @@ export function FilePreviewModal({ name, onClose, onDownload, getFileContent }:
         if (previewType === "text" || previewType === "markdown") {
           const text = await blob.text();
           if (!cancelled) setContent(text);
+        } else if (previewType === "eml") {
+          // Parse the embedded message (postal-mime, dynamic-imported so it
+          // stays off the bundle) and render it like an email via EmlPreview.
+          const { default: PostalMime } = await import("postal-mime");
+          const parsed = await new PostalMime().parse(await blob.arrayBuffer());
+          if (!cancelled) setEmlContent(parsed as ParsedEml);
         } else {
-          revokeUrl = URL.createObjectURL(blob);
+          // Stalwart's download endpoint can return generic
-          if (!cancelled) setObjectUrl(revokeUrl);
+          // application/octet-stream for attachments even when the email's
+          // MIME structure declared application/pdf (etc.). The blob inherits
+          // that, so a blob: URL plugged into <iframe> looks like a binary
+          // stream and Chrome/Edge silently download it (with the blob UUID
+          // as filename) instead of rendering inline. Re-wrap with the most
+          // specific MIME we can resolve - prefer explicit attachment type,
+          // then filename-derived MIME, then whatever the blob came with.
+          const inferredFromName = inferMimeFromName(name);
+          const isUseless = (ty?: string) =>
+            !ty || ty === "application/octet-stream" || ty === "binary/octet-stream";
+          const effectiveType =
+            (contentType && !isUseless(contentType) ? contentType : undefined)
+            ?? inferredFromName
+            ?? blob.type;
+          const typedBlob = blob.type !== effectiveType
+            ? new Blob([blob], { type: effectiveType })
+            : blob;
+          revokeUrl = URL.createObjectURL(typedBlob);
+          if (!cancelled) {
+            setObjectUrl(revokeUrl);
+            setCanOpenInNewTab(isMimeTypeSafeForInlinePreview(effectiveType));
+          }
         }
       } catch {
         if (!cancelled) setError(true);
@@ -173,6 +288,18 @@ export function FilePreviewModal({ name, onClose, onDownload, getFileContent }:
       <div className="flex items-center justify-between px-4 py-3 bg-background/90 backdrop-blur border-b border-border" onClick={(e) => e.stopPropagation()}>
         <h3 className="text-sm font-medium truncate">{name}</h3>
         <div className="flex items-center gap-2">
+          {objectUrl && canOpenInNewTab && (
+            <Button
+              variant="ghost"
+              size="icon"
+              className="h-8 w-8"
+              title={t("open_in_new_tab")}
+              aria-label={t("open_in_new_tab")}
+              onClick={() => window.open(objectUrl, "_blank", "noopener,noreferrer")}
+            >
+              <ExternalLink className="w-4 h-4" />
+            </Button>
+          )}
           <Button variant="ghost" size="icon" className="h-8 w-8" onClick={() => void onDownload()}>
             <Download className="w-4 h-4" />
           </Button>
@@ -211,6 +338,10 @@ export function FilePreviewModal({ name, onClose, onDownload, getFileContent }:
           </div>
         )}
 
+        {!loading && !error && fileType === "eml" && emlContent && (
+          <EmlPreview message={emlContent} />
+        )}
+
         {!loading && !error && fileType === "image" && objectUrl && (
           <img
             src={objectUrl}
@@ -231,19 +362,29 @@ export function FilePreviewModal({ name, onClose, onDownload, getFileContent }:
           />
         )}
 
-        {!loading && !error && fileType === "pdf" && objectUrl && (
+        {!loading && !error && fileType === "pdf" && objectUrl && pdfInlineSupported && (
-          <object
+          // <iframe> renders PDFs reliably across desktop Chromium, Firefox,
-            data={objectUrl}
+          // and Safari from a blob: URL. <object> was prone to falling back to
-            type="application/pdf"
+          // a silent download when the blob's Content-Type wasn't recognised.
+          <iframe
+            src={objectUrl}
             className="w-full max-w-5xl h-full rounded-lg bg-white"
-            aria-label={name}
+            title={name}
+            onClick={(e) => e.stopPropagation()}
+          />
+        )}
+
+        {!loading && !error && fileType === "pdf" && objectUrl && !pdfInlineSupported && (
+          // Mobile browsers can't show a PDF inline in an <iframe> (Android: a
+          // blank frame / silent download; iOS: only the first page), so render
+          // it with pdf.js (canvas) instead. The header's open-in-new-tab /
+          // download actions are the fallback if pdf.js can't render the doc.
+          <div
+            className="w-full max-w-3xl h-full overflow-auto rounded-lg bg-neutral-200 dark:bg-neutral-800 p-2"
             onClick={(e) => e.stopPropagation()}
           >
-            <Button onClick={() => void onDownload()}>
+            <PdfMobileViewer url={objectUrl} />
-              <Download className="w-4 h-4 mr-2" />
+          </div>
-              {t("download")}
-            </Button>
-          </object>
         )}
 
         {!loading && !error && fileType === "audio" && objectUrl && (

components/files/pdf-mobile-viewer.tsx

@@ -0,0 +1,223 @@
+"use client";
+
+import { useEffect, useRef, useState } from "react";
+import { useTranslations } from "next-intl";
+import { Loader2, ExternalLink } from "lucide-react";
+import { Button } from "@/components/ui/button";
+
+// Real inline PDF preview for mobile browsers. Android Chrome / iOS WebKit have
+// no native inline PDF viewer, so the desktop <iframe src=blob:> approach
+// renders a blank frame. pdf.js rasterises each page to a <canvas> in pure JS,
+// so it works everywhere regardless of native PDF support.
+//
+// This component is dynamic-imported (ssr:false) only on the mobile PDF path,
+// and it dynamic-imports pdfjs-dist itself, so the (~hundreds of KB) library +
+// worker never reach the desktop bundle.
+
+// iOS WebKit caps total canvas area (~16 MP) and is memory-sensitive; keep each
+// page's backing store well under that so large pages don't render blank. The
+// backing store is rendered at ~2x the fit width (dpr), which also gives the
+// double-tap zoom some headroom before CSS upscaling softens the text.
+const MAX_CANVAS_AREA = 4_000_000; // ~4 MP per page
+
+// Double-tap zoom steps: fit -> 2x -> 3x -> fit. Implemented as the page
+// container's CSS width (so panning is native scrolling, not a transform).
+const ZOOM_STEPS = [1, 2, 3];
+const MAX_ZOOM = 4; // pinch can go a bit beyond the double-tap steps
+const DOUBLE_TAP_MS = 300;
+const DOUBLE_TAP_SLOP = 30; // px
+
+export function PdfMobileViewer({ url }: { url: string }) {
+  const rootRef = useRef<HTMLDivElement>(null);
+  const pagesRef = useRef<HTMLDivElement>(null);
+  const zoom = useRef({ step: 0, scale: 1 });
+  const [status, setStatus] = useState<"loading" | "ready" | "error">("loading");
+  const t = useTranslations("files");
+
+  // Render the PDF pages to canvases.
+  useEffect(() => {
+    let cancelled = false;
+    let loadingTask: import("pdfjs-dist").PDFDocumentLoadingTask | null = null;
+
+    // Reset zoom for a freshly loaded document.
+    zoom.current = { step: 0, scale: 1 };
+    if (pagesRef.current) pagesRef.current.style.width = "100%";
+
+    (async () => {
+      try {
+        const pdfjs = await import("pdfjs-dist");
+        pdfjs.GlobalWorkerOptions.workerSrc = new URL(
+          "pdfjs-dist/build/pdf.worker.min.mjs",
+          import.meta.url,
+        ).toString();
+
+        loadingTask = pdfjs.getDocument({ url });
+        const doc = await loadingTask.promise;
+        if (cancelled) return;
+
+        const pages = pagesRef.current;
+        if (!pages) return;
+        pages.replaceChildren();
+
+        const dpr = Math.min(window.devicePixelRatio || 1, 2);
+        const cssWidth = Math.min(pages.clientWidth || 320, 900);
+
+        for (let n = 1; n <= doc.numPages; n++) {
+          if (cancelled) return;
+          const page = await doc.getPage(n);
+          const baseVp = page.getViewport({ scale: 1 });
+          let scale = (cssWidth / baseVp.width) * dpr;
+          const area = baseVp.width * scale * (baseVp.height * scale);
+          if (area > MAX_CANVAS_AREA) scale *= Math.sqrt(MAX_CANVAS_AREA / area);
+          const viewport = page.getViewport({ scale });
+
+          const canvas = document.createElement("canvas");
+          canvas.width = Math.floor(viewport.width);
+          canvas.height = Math.floor(viewport.height);
+          canvas.style.width = "100%";
+          canvas.style.height = "auto";
+          canvas.style.display = "block";
+          canvas.style.margin = "0 auto 8px";
+          canvas.style.background = "#fff";
+          pages.appendChild(canvas);
+          await page.render({ canvas, viewport }).promise;
+        }
+        if (!cancelled) setStatus("ready");
+      } catch {
+        if (!cancelled) setStatus("error");
+      }
+    })();
+
+    return () => {
+      cancelled = true;
+      void loadingTask?.destroy().catch(() => {});
+    };
+  }, [url]);
+
+  // Gesture zoom. 1-finger double-tap cycles the steps (fit -> 2x -> 3x ->
+  // fit); 2-finger pinch zooms continuously up to MAX_ZOOM. Both drive a
+  // per-page CSS-width zoom that pans via native scrolling and re-centre on the
+  // gesture point. touch-action (pan-x pan-y) keeps 1-finger panning native
+  // while disabling the browser's own pinch/double-tap page zoom, which we
+  // replace here.
+  useEffect(() => {
+    const root = rootRef.current;
+    if (!root) return;
+
+    const distance = (a: Touch, b: Touch) =>
+      Math.hypot(a.clientX - b.clientX, a.clientY - b.clientY);
+
+    // Apply an absolute zoom scale, keeping (cx, cy) [relative to root] under
+    // the same content point.
+    const applyZoom = (target: number, cx: number, cy: number) => {
+      const pages = pagesRef.current;
+      if (!pages) return;
+      const next = Math.max(1, Math.min(MAX_ZOOM, target));
+      const ratio = next / zoom.current.scale;
+      if (ratio === 1) return;
+      pages.style.width = `${next * 100}%`;
+      void root.offsetWidth; // force reflow so the new scroll range is live
+      root.scrollLeft = (root.scrollLeft + cx) * ratio - cx;
+      root.scrollTop = (root.scrollTop + cy) * ratio - cy;
+      zoom.current.scale = next;
+    };
+
+    let lastTap = 0;
+    let lastX = 0;
+    let lastY = 0;
+    let pinching = false;
+    let pinchStartDist = 0;
+    let pinchStartScale = 1;
+    let didPinch = false;
+
+    const onStart = (e: TouchEvent) => {
+      if (e.touches.length === 2) {
+        pinching = true;
+        didPinch = true;
+        pinchStartDist = distance(e.touches[0], e.touches[1]) || 1;
+        pinchStartScale = zoom.current.scale;
+      }
+    };
+
+    const onMove = (e: TouchEvent) => {
+      if (!pinching || e.touches.length !== 2) return;
+      e.preventDefault(); // take over the 2-finger gesture from native pan
+      const rect = root.getBoundingClientRect();
+      const cx = (e.touches[0].clientX + e.touches[1].clientX) / 2 - rect.left;
+      const cy = (e.touches[0].clientY + e.touches[1].clientY) / 2 - rect.top;
+      applyZoom(pinchStartScale * (distance(e.touches[0], e.touches[1]) / pinchStartDist), cx, cy);
+    };
+
+    const onEnd = (e: TouchEvent) => {
+      if (pinching && e.touches.length < 2) {
+        pinching = false;
+        // Snap the step index to the current scale so double-tap stays sensible.
+        const s = zoom.current.scale;
+        zoom.current.step = s <= 1.01 ? 0 : s < 3 ? 1 : 2;
+      }
+      if (e.touches.length > 0) return; // fingers still down
+      if (didPinch) {
+        didPinch = false; // a pinch is not a tap
+        return;
+      }
+      if (e.changedTouches.length !== 1) return;
+      const touch = e.changedTouches[0];
+      const now = e.timeStamp;
+      const isDouble =
+        now - lastTap < DOUBLE_TAP_MS &&
+        Math.abs(touch.clientX - lastX) < DOUBLE_TAP_SLOP &&
+        Math.abs(touch.clientY - lastY) < DOUBLE_TAP_SLOP;
+      if (!isDouble) {
+        lastTap = now;
+        lastX = touch.clientX;
+        lastY = touch.clientY;
+        return;
+      }
+      lastTap = 0; // consume so a third tap starts fresh
+      e.preventDefault();
+      const rect = root.getBoundingClientRect();
+      zoom.current.step = (zoom.current.step + 1) % ZOOM_STEPS.length;
+      applyZoom(ZOOM_STEPS[zoom.current.step], touch.clientX - rect.left, touch.clientY - rect.top);
+    };
+
+    root.addEventListener("touchstart", onStart, { passive: true });
+    root.addEventListener("touchmove", onMove, { passive: false });
+    root.addEventListener("touchend", onEnd, { passive: false });
+    return () => {
+      root.removeEventListener("touchstart", onStart);
+      root.removeEventListener("touchmove", onMove);
+      root.removeEventListener("touchend", onEnd);
+    };
+  }, []);
+
+  return (
+    <div
+      ref={rootRef}
+      className="w-full h-full overflow-auto"
+      // Allow panning, but disable the browser's pinch/double-tap page zoom so
+      // our own double-tap zoom drives the PDF instead of the whole modal.
+      style={{ touchAction: "pan-x pan-y" }}
+    >
+      {status === "loading" && (
+        <div className="flex justify-center py-10">
+          <Loader2 className="w-6 h-6 animate-spin text-muted-foreground" />
+        </div>
+      )}
+      {status === "error" && (
+        // pdf.js couldn't render this document (corrupt/encrypted, worker load
+        // failure, ...). Offer the OS/native viewer instead of a stuck frame.
+        <div className="flex justify-center py-10">
+          <Button
+            variant="outline"
+            size="sm"
+            onClick={() => window.open(url, "_blank", "noopener,noreferrer")}
+          >
+            <ExternalLink className="w-4 h-4 mr-2" />
+            {t("open_in_new_tab")}
+          </Button>
+        </div>
+      )}
+      <div ref={pagesRef} className="w-full" />
+    </div>
+  );
+}

components/filters/filter-rule-modal.tsx

@@ -27,7 +27,7 @@ interface FilterRuleModalProps {
 }
 
 const ALL_FIELDS: FilterConditionField[] = [
-  "from", "to", "cc", "subject", "header", "size", "body",
+  "from", "to", "cc", "subject", "header", "size", "body", "attachment",
 ];
 
 const TEXT_COMPARATORS: FilterComparator[] = [
@@ -36,6 +36,14 @@ const TEXT_COMPARATORS: FilterComparator[] = [
 
 const SIZE_COMPARATORS: FilterComparator[] = ["greater_than", "less_than"];
 
+const ATTACHMENT_COMPARATORS: FilterComparator[] = ["has_any", "has_type"];
+
+function comparatorsFor(field: FilterConditionField): FilterComparator[] {
+  if (field === "size") return SIZE_COMPARATORS;
+  if (field === "attachment") return ATTACHMENT_COMPARATORS;
+  return TEXT_COMPARATORS;
+}
+
 const ALL_ACTION_TYPES: FilterActionType[] = [
   "move", "copy", "forward", "mark_read", "star", "add_label", "discard", "reject", "keep", "stop",
 ];
@@ -47,6 +55,27 @@ function makeEmptyCondition(): FilterCondition {
   return { field: "from", comparator: "contains", value: "" };
 }
 
+// Multi-value handling: conditions are stored as string | string[]. The UI
+// presents them as a single comma-separated text input — the user types
+// "a, b, c" and the saved value becomes ["a","b","c"]. Single entries stay
+// strings so existing single-value rules don't change shape.
+function valueToInputString(v: string | string[]): string {
+  if (Array.isArray(v)) return v.join(", ");
+  return v;
+}
+
+function inputStringToValue(s: string): string | string[] {
+  const parts = s.split(",").map((p) => p.trim()).filter((p) => p.length > 0);
+  if (parts.length === 0) return "";
+  if (parts.length === 1) return parts[0];
+  return parts;
+}
+
+function isConditionValueEmpty(v: string | string[]): boolean {
+  if (Array.isArray(v)) return v.length === 0 || v.every((x) => !x.trim());
+  return !v.trim();
+}
+
 function makeEmptyAction(): FilterAction {
   return { type: "move", value: "" };
 }
@@ -97,9 +126,23 @@ export function FilterRuleModal({
       return;
     }
 
-    const validConditions = conditions.filter(
+    // While editing, condition.value is always the raw string typed into the
-      (c) => c.value.trim()
+    // input (commas not yet split). Convert to array form here on save so a
-    );
+    // user typing "a, b, c" actually persists as ["a","b","c"]. This is the
+    // moment we know editing is finished - splitting earlier would eat any
+    // comma the user just typed mid-edit.
+    const validConditions = conditions
+      .filter((c) => {
+        if (c.field === "attachment" && c.comparator === "has_any") return true;
+        return !isConditionValueEmpty(c.value);
+      })
+      .map((c) => {
+        if (c.field === "attachment" && c.comparator === "has_any") return c;
+        if (c.field === "size") return c; // numeric, single-value only
+        if (typeof c.value !== "string") return c; // already structured
+        const parsed = inputStringToValue(c.value);
+        return { ...c, value: parsed };
+      });
     if (validConditions.length === 0) {
       toast.error(t("validation_empty_conditions"));
       return;
@@ -129,15 +172,27 @@ export function FilterRuleModal({
       prev.map((c, i) => {
         if (i !== index) return c;
         const updated = { ...c, ...updates };
-        if (updates.field === "size" && !SIZE_COMPARATORS.includes(c.comparator)) {
+        // Reconcile the comparator when the field changes so we never end up
-          updated.comparator = "greater_than";
+        // with e.g. (field=attachment, comparator=contains) — invalid for the
-        }
+        // Sieve generator. Each field has its own valid comparator set.
-        if (updates.field && updates.field !== "size" && SIZE_COMPARATORS.includes(c.comparator)) {
+        if (updates.field && updates.field !== c.field) {
-          updated.comparator = "contains";
+          const allowed = comparatorsFor(updates.field);
+          if (!allowed.includes(c.comparator)) {
+            updated.comparator = allowed[0];
+          }
         }
         if (updates.field && updates.field !== "header") {
           delete updated.headerName;
         }
+        // has_any takes no value; clear it so we don't leak old text into
+        // the generated Sieve.
+        if (updated.field === "attachment" && updated.comparator === "has_any") {
+          updated.value = "";
+        }
+        // Size is numeric, single value only - collapse any list to scalar.
+        if (updated.field === "size" && Array.isArray(updated.value)) {
+          updated.value = updated.value[0] ?? "";
+        }
         return updated;
       })
     );
@@ -281,24 +336,58 @@ export function FilterRuleModal({
                     className={selectClass}
                     aria-label={t("comparators.contains")}
                   >
-                    {(condition.field === "size" ? SIZE_COMPARATORS : TEXT_COMPARATORS).map(
+                    {comparatorsFor(condition.field).map((c) => (
-                      (c) => (
+                      <option key={c} value={c}>
-                        <option key={c} value={c}>
+                        {t(`comparators.${c}`)}
-                          {t(`comparators.${c}`)}
+                      </option>
-                        </option>
+                    ))}
-                      )
-                    )}
                   </select>
 
-                  <Input
+                  {/* has_any takes no value; render a stub so the row layout
-                    value={condition.value}
+                      stays consistent but no input is editable. */}
-                    onChange={(e) => updateCondition(index, { value: e.target.value })}
+                  {condition.field === "attachment" && condition.comparator === "has_any" ? (
-                    placeholder={
+                    <div className="flex-1 min-w-[120px]" />
-                      condition.field === "size" ? t("size_placeholder") : t("header_placeholder")
+                  ) : (
-                    }
+                    <Input
-                    className="flex-1 min-w-[120px]"
+                      value={valueToInputString(condition.value)}
-                    type={condition.field === "size" ? "number" : "text"}
+                      onChange={(e) =>
-                  />
+                        // Store the raw input string while typing. Splitting
+                        // commas into an array on every keystroke would eat
+                        // the comma the moment it's typed.
+                        updateCondition(index, { value: e.target.value })
+                      }
+                      onBlur={(e) => {
+                        // On blur: normalise comma-separated input into an
+                        // array (or single string when only one item). Size
+                        // stays numeric/single-value; attachment-has_any has
+                        // no value at all.
+                        if (condition.field === "size") return;
+                        if (
+                          condition.field === "attachment" &&
+                          condition.comparator === "has_any"
+                        )
+                          return;
+                        const parsed = inputStringToValue(e.target.value);
+                        // Only update if the normalised shape actually
+                        // differs - avoids triggering a no-op re-render and
+                        // resetting the user's cursor on every blur.
+                        if (
+                          JSON.stringify(parsed) !== JSON.stringify(condition.value)
+                        ) {
+                          updateCondition(index, { value: parsed });
+                        }
+                      }}
+                      placeholder={
+                        condition.field === "size"
+                          ? t("size_placeholder")
+                          : condition.field === "attachment"
+                            ? t("attachment_type_placeholder")
+                            : t("value_placeholder_multi")
+                      }
+                      className="flex-1 min-w-[120px]"
+                      type={condition.field === "size" ? "number" : "text"}
+                    />
+                  )}
 
                   <button
                     type="button"

components/identity/identity-form.tsx

@@ -8,7 +8,7 @@ import type { Identity, EmailAddress } from '@/lib/jmap/types';
 import { sanitizeSignatureHtml } from '@/lib/email-sanitization';
 import { getEmailValidationError, validateEmailList } from '@/lib/validation';
 
-// JMAP Identity/set caps signature fields at 2047 UTF-8 bytes per RFC 8621 §6.1.
+// Stalwarts JMAP Identity/set caps signature fields at 2047 UTF-8 bytes
 const SIGNATURE_MAX_BYTES = 2047;
 const utf8Encoder = new TextEncoder();
 

components/layout/navigation-rail.tsx

@@ -21,7 +21,7 @@ import { getMaxAccounts } from "@/lib/account-utils";
 import { cn, formatFileSize } from "@/lib/utils";
 import { PluginSlot } from "@/components/plugins/plugin-slot";
 import { KeyboardShortcutsModal } from "@/components/keyboard-shortcuts-modal";
-import { apiFetch } from "@/lib/browser-navigation";
+import { apiFetch, getPathPrefix, withBasePath } from "@/lib/browser-navigation";
 import { Avatar } from "@/components/ui/avatar";
 
 interface NavItem {
@@ -385,7 +385,7 @@ export function NavigationRail({
         {/* Admin (Stalwart admins) - hard nav because /admin lives outside the [locale] tree */}
         {isStalwartAdmin && (
           <a
-            href="/admin"
+            href={`${getPathPrefix()}/admin`}
             className={cn(
               "flex flex-col items-center justify-center gap-1 py-2 px-1 min-h-[44px] grow shrink-0 basis-[64px]",
               "transition-colors duration-150",
@@ -444,7 +444,7 @@ export function NavigationRail({
       )}
     >
       {(() => {
-        const logoUrl = resolvedTheme === 'dark' ? (appLogoDarkUrl || appLogoLightUrl) : (appLogoLightUrl || appLogoDarkUrl);
+        const logoUrl = withBasePath(resolvedTheme === 'dark' ? (appLogoDarkUrl || appLogoLightUrl) : (appLogoLightUrl || appLogoDarkUrl));
         return logoUrl ? (
           <div className="flex items-center justify-center py-3 px-1">
             <img
@@ -572,7 +572,7 @@ export function NavigationRail({
       <div className="mt-auto flex flex-col items-center gap-2 pb-3 px-1">
         {isStalwartAdmin && (
           <a
-            href="/admin"
+            href={`${getPathPrefix()}/admin`}
             className="flex items-center justify-center w-10 h-10 rounded-md transition-colors text-muted-foreground hover:text-foreground hover:bg-muted relative"
             title={t("admin") || "Admin"}
           >

components/layout/resize-handle.tsx

@@ -77,9 +77,11 @@ export function ResizeHandle({ onResizeStart, onResize, onResizeEnd, onDoubleCli
       onKeyDown={handleKeyDown}
       onDoubleClick={onDoubleClick}
       className={cn(
-        "flex-shrink-0 hover:bg-primary/30 active:bg-primary/50 transition-colors relative group",
+        // Centered over the seam with negative margins so the handle adds no
+        // net layout space (panes sit flush) while staying draggable.
+        "flex-shrink-0 hover:bg-primary/30 active:bg-primary/50 transition-colors relative group z-10",
         "focus-visible:outline-none focus-visible:bg-primary/40 focus-visible:ring-2 focus-visible:ring-primary/50",
-        isHorizontal ? "h-1 cursor-row-resize bg-border" : "w-1 cursor-col-resize",
+        isHorizontal ? "h-1 -my-0.5 cursor-row-resize bg-border" : "w-1 -mx-0.5 cursor-col-resize",
         className
       )}
     >

components/layout/sidebar.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useState, useEffect, ReactNode } from "react";
+import { useState, useEffect, useMemo, ReactNode } from "react";
 import { useTranslations } from "next-intl";
 import { useRouter } from "@/i18n/navigation";
 import { PluginSlot } from "@/components/plugins/plugin-slot";
@@ -74,6 +74,8 @@ interface SidebarProps {
   onDeleteFolder?: (mailboxId: string) => void;
   onImportEmail?: (mailboxId: string) => void;
   onRefreshMailboxes?: () => void;
+  scheduledTotal?: number;
+  showScheduledMailbox?: boolean;
   className?: string;
   /**
    * Multi-account (Pro) mode props. When `multiAccountMode` is true, the
@@ -674,6 +676,8 @@ export function Sidebar({
   onDeleteFolder,
   onImportEmail,
   onRefreshMailboxes,
+  scheduledTotal = 0,
+  showScheduledMailbox = false,
   className,
   multiAccountMode = false,
   accountMailboxes,
@@ -732,15 +736,20 @@ export function Sidebar({
   // pane.
   const hideAccountSwitcher = useSettingsStore(s => s.hideAccountSwitcher) || isEmbedded;
   const enableUnifiedMailbox = useSettingsStore(s => s.enableUnifiedMailbox);
+  const includeGroupInUnified = useSettingsStore(s => s.includeGroupInUnified);
   const colorfulSidebarIcons = useSettingsStore(s => s.colorfulSidebarIcons);
   const tagCounts = useEmailStore(s => s.tagCounts);
   const accounts = useAccountStore(s => s.accounts);
   const connectedAccounts = accounts.filter(a => a.isConnected);
+  const hasGroupInboxes = useMemo(() => mailboxes.some(m => m.isShared), [mailboxes]);
   // Pro shell treats the unified mailbox as a core part of the multi-account
-  // UI, so it ignores the user-facing `enableUnifiedMailbox` toggle. The
+  // UI, so it ignores the user-facing `enableUnifiedMailbox` toggle. With a
-  // 2+ account requirement still applies - with a single account the
+  // single account we still surface unified when the user has opted into
-  // unified counts would just duplicate that account's inbox.
+  // merging group/shared inboxes — otherwise the counts would just duplicate
-  const showUnified = (multiAccountMode || enableUnifiedMailbox) && connectedAccounts.length > 1;
+  // the one inbox.
+  const showUnified =
+    (multiAccountMode || enableUnifiedMailbox) &&
+    (connectedAccounts.length > 1 || (includeGroupInUnified && hasGroupInboxes));
   const { unifiedCounts } = useEmailStore();
   const t = useTranslations('sidebar');
 
@@ -895,11 +904,11 @@ export function Sidebar({
   };
 
   const openFolderSettings = () => {
-    try { localStorage.setItem('settings-active-tab', 'folders'); } catch { /* */ }
+    try { sessionStorage.setItem('settings-deep-link-tab', 'folders'); } catch { /* */ }
     router.push('/settings');
   };
   const openKeywordSettings = () => {
-    try { localStorage.setItem('settings-active-tab', 'keywords'); } catch { /* */ }
+    try { sessionStorage.setItem('settings-deep-link-tab', 'keywords'); } catch { /* */ }
     router.push('/settings');
   };
 
@@ -933,30 +942,34 @@ export function Sidebar({
       {/* Header - hidden in the Pro shell, which owns its own chrome and
           would otherwise render an empty strip (no collapse, no switcher). */}
       {!isEmbedded && (
-        <div className={cn("flex items-center border-b border-border", isCollapsed ? "justify-center px-2 py-2" : "gap-1 px-2 py-2")}>
+        // Border lives on the wrapper (outside the h-14 box) so the bar's total
-          <Button
+        // height matches the search/reply toolbars, which border-b their wrapper too.
-            variant="ghost"
+        <div className="border-b border-border">
-            size="icon"
+          <div className={cn("flex items-center h-14", isCollapsed ? "justify-center px-2" : "gap-1 px-2")}>
-            onClick={onSidebarClose}
+            <Button
-            className="lg:hidden h-9 w-9 flex-shrink-0"
+              variant="ghost"
-            aria-label={t("close")}
+              size="icon"
-          >
+              onClick={onSidebarClose}
-            <X className="w-5 h-5" />
+              className="lg:hidden h-9 w-9 flex-shrink-0"
-          </Button>
+              aria-label={t("close")}
+            >
+              <X className="w-5 h-5" />
+            </Button>
 
-          <Button
+            <Button
-            variant="ghost"
+              variant="ghost"
-            size="icon"
+              size="icon"
-            onClick={toggleSidebarCollapsed}
+              onClick={toggleSidebarCollapsed}
-            className="hidden lg:flex h-8 w-8 flex-shrink-0"
+              className="hidden lg:flex h-8 w-8 flex-shrink-0"
-            title={isCollapsed ? t("expand_tooltip") : t("collapse_tooltip")}
+              title={isCollapsed ? t("expand_tooltip") : t("collapse_tooltip")}
-          >
+            >
-            {isCollapsed ? <ChevronsRight className="w-4 h-4" /> : <ChevronsLeft className="w-4 h-4" />}
+              {isCollapsed ? <ChevronsRight className="w-4 h-4" /> : <ChevronsLeft className="w-4 h-4" />}
-          </Button>
+            </Button>
 
-          {!isCollapsed && !hideAccountSwitcher && (
+            {!isCollapsed && !hideAccountSwitcher && (
-            <AccountSwitcher variant="expanded" className="flex-1" />
+              <AccountSwitcher variant="expanded" className="flex-1" />
-          )}
+            )}
+          </div>
         </div>
       )}
 
@@ -1022,22 +1035,35 @@ export function Sidebar({
                         {!isCollapsed && t("loading_mailboxes")}
                       </div>
                     ) : (
-                      tree.map((node) => (
+                      <>
-                        <MailboxTreeItem
+                        {tree.map((node) => (
-                          key={node.id}
+                          <MailboxTreeItem
-                          node={node}
+                            key={node.id}
-                          selectedMailbox={selectedKeyword || !isViewing ? "" : selectedMailbox}
+                            node={node}
-                          expandedFolders={expandedFolders}
+                            selectedMailbox={selectedKeyword || !isViewing ? "" : selectedMailbox}
-                          onMailboxSelect={(mailboxId) =>
+                            expandedFolders={expandedFolders}
-                            onAccountMailboxSelect?.(isActive ? null : account.id, mailboxId)
+                            onMailboxSelect={(mailboxId) =>
-                          }
+                              onAccountMailboxSelect?.(isActive ? null : account.id, mailboxId)
-                          onToggleExpand={handleToggleExpand}
+                            }
-                          isCollapsed={isCollapsed}
+                            onToggleExpand={handleToggleExpand}
-                          onUnreadFilterClick={isActive ? onUnreadFilterClick : undefined}
+                            isCollapsed={isCollapsed}
-                          colorful={colorfulSidebarIcons}
+                            onUnreadFilterClick={isActive ? onUnreadFilterClick : undefined}
-                          onContextMenu={isActive ? handleMailboxContextMenu : undefined}
+                            colorful={colorfulSidebarIcons}
-                        />
+                            onContextMenu={isActive ? handleMailboxContextMenu : undefined}
-                      ))
+                          />
+                        ))}
+                        {isActive && showScheduledMailbox && (
+                          <SidebarRow
+                            icon={<CalendarClock className={cn("w-4 h-4 flex-shrink-0", selectedMailbox === '__scheduled__' ? "text-foreground" : "text-muted-foreground")} />}
+                            label={t('scheduled')}
+                            depth={0}
+                            isSelected={!selectedKeyword && selectedMailbox === '__scheduled__'}
+                            total={scheduledTotal}
+                            onClick={() => onMailboxSelect?.('__scheduled__')}
+                            isCollapsed={isCollapsed}
+                          />
+                        )}
+                      </>
                     )}
                   </>
                 )}
@@ -1062,20 +1088,33 @@ export function Sidebar({
                     {!isCollapsed && t("loading_mailboxes")}
                   </div>
                 ) : (
-                  ownTree.map((node) => (
+                  <>
-                    <MailboxTreeItem
+                    {ownTree.map((node) => (
-                      key={node.id}
+                        <MailboxTreeItem
-                      node={node}
+                          key={node.id}
-                      selectedMailbox={selectedKeyword ? "" : selectedMailbox}
+                          node={node}
-                      expandedFolders={expandedFolders}
+                          selectedMailbox={selectedKeyword ? "" : selectedMailbox}
-                      onMailboxSelect={onMailboxSelect}
+                          expandedFolders={expandedFolders}
-                      onToggleExpand={handleToggleExpand}
+                          onMailboxSelect={onMailboxSelect}
-                      isCollapsed={isCollapsed}
+                          onToggleExpand={handleToggleExpand}
-                      onUnreadFilterClick={onUnreadFilterClick}
+                          isCollapsed={isCollapsed}
-                      colorful={colorfulSidebarIcons}
+                          onUnreadFilterClick={onUnreadFilterClick}
-                      onContextMenu={handleMailboxContextMenu}
+                          colorful={colorfulSidebarIcons}
-                    />
+                          onContextMenu={handleMailboxContextMenu}
-                  ))
+                        />
+                    ))}
+                    {showScheduledMailbox && (
+                      <SidebarRow
+                        icon={<CalendarClock className={cn("w-4 h-4 flex-shrink-0", selectedMailbox === '__scheduled__' ? "text-foreground" : "text-muted-foreground")} />}
+                        label={t('scheduled')}
+                        depth={0}
+                        isSelected={!selectedKeyword && selectedMailbox === '__scheduled__'}
+                        total={scheduledTotal}
+                        onClick={() => onMailboxSelect?.('__scheduled__')}
+                        isCollapsed={isCollapsed}
+                      />
+                    )}
+                  </>
                 )}
               </>
             )}

components/plugins/plugin-dialog-host.tsx

@@ -7,6 +7,19 @@
 import React, { useEffect, useSyncExternalStore } from 'react';
 import { head, resolveHead, subscribe } from '@/lib/plugin-sandbox/host-dialog';
 
+// Lightweight **bold** support in plugin dialog messages. Everything else is
+// rendered literally (newlines come from the parent's white-space: pre-wrap).
+// Splitting on the ** delimiter yields alternating plain/bold segments (odd
+// indices are bold). Plugins control these strings, so the delimiters balance.
+function renderMessage(message?: string): React.ReactNode {
+  if (!message) return null;
+  return message.split('**').map((seg, i) =>
+    i % 2 === 1
+      ? <strong key={i}>{seg}</strong>
+      : <React.Fragment key={i}>{seg}</React.Fragment>,
+  );
+}
+
 export function PluginDialogHost(): React.JSX.Element | null {
   const current = useSyncExternalStore(subscribe, head, () => null);
 
@@ -50,9 +63,9 @@ export function PluginDialogHost(): React.JSX.Element | null {
     >
       <div
         style={{
-          background: 'var(--background, #fff)',
+          background: 'var(--color-popover, #fff)',
-          color: 'var(--foreground, #0f172a)',
+          color: 'var(--color-popover-foreground, #0f172a)',
-          border: '1px solid var(--border, #e2e8f0)',
+          border: '1px solid var(--color-border, #e2e8f0)',
           borderRadius: 12,
           padding: 20,
           maxWidth: 480,
@@ -63,8 +76,8 @@ export function PluginDialogHost(): React.JSX.Element | null {
         <h2 id="plugin-dialog-title" style={{ fontSize: 16, fontWeight: 600, margin: '0 0 10px 0' }}>
           {current.title}
         </h2>
-        <p style={{ fontSize: 13, lineHeight: 1.5, margin: '0 0 16px 0', color: 'var(--muted-foreground, #64748b)', whiteSpace: 'pre-wrap' }}>
+        <p style={{ fontSize: 13, lineHeight: 1.5, margin: '0 0 16px 0', color: 'var(--color-muted-foreground, #64748b)', whiteSpace: 'pre-wrap', overflowWrap: 'anywhere' }}>
-          {current.message}
+          {renderMessage(current.message)}
         </p>
         <div style={{ display: 'flex', gap: 8, justifyContent: 'flex-end' }}>
           {current.kind === 'confirm' && (
@@ -78,7 +91,7 @@ export function PluginDialogHost(): React.JSX.Element | null {
                 fontSize: 13,
                 fontWeight: 500,
                 cursor: 'pointer',
-                border: '1px solid var(--border, #e2e8f0)',
+                border: '1px solid var(--color-border, #e2e8f0)',
                 background: 'transparent',
                 color: 'inherit',
               }}
@@ -97,14 +110,14 @@ export function PluginDialogHost(): React.JSX.Element | null {
               fontWeight: 500,
               cursor: 'pointer',
               border: '1px solid transparent',
-              background: current.danger ? '#dc2626' : '#3b82f6',
+              background: current.danger ? 'var(--color-destructive, #dc2626)' : 'var(--color-primary, #3b82f6)',
-              color: '#fff',
+              color: current.danger ? 'var(--color-destructive-foreground, #fff)' : 'var(--color-primary-foreground, #fff)',
             }}
           >
             {confirmLabel}
           </button>
         </div>
-        <div style={{ marginTop: 12, fontSize: 11, color: 'var(--muted-foreground, #94a3b8)', textAlign: 'right' }}>
+        <div style={{ marginTop: 12, fontSize: 11, color: 'var(--color-muted-foreground, #94a3b8)', textAlign: 'right' }}>
           From plugin: {current.pluginId}
         </div>
       </div>

components/plugins/plugin-iframe-slot.tsx

@@ -10,6 +10,8 @@ import React, { useEffect, useRef, useState } from 'react';
 import type { SlotName } from '@/lib/plugin-types';
 import { get as getActivePlugin } from '@/lib/plugin-sandbox/registry';
 import { createSlotInstance, type SandboxInstance } from '@/lib/plugin-sandbox/host-bridge';
+import { snapshotHostTheme } from '@/lib/plugin-sandbox/host-theme';
+import { useThemeStore } from '@/stores/theme-store';
 
 interface Props {
   pluginId: string;
@@ -69,6 +71,16 @@ export function PluginIframeSlot({ pluginId, slot, extraProps }: Props) {
     instanceRef.current?.updateProps(extraProps ?? {});
   }, [extraProps]);
 
+  // Re-theme the live slot iframe when the host theme changes (dark/light
+  // toggle or custom theme switch), without tearing down the iframe. Reacting
+  // to resolvedTheme + activeThemeId covers both; the snapshot reads the
+  // resolved DOM values so it picks up whichever is active.
+  const resolvedTheme = useThemeStore((s) => s.resolvedTheme);
+  const activeThemeId = useThemeStore((s) => s.activeThemeId);
+  useEffect(() => {
+    instanceRef.current?.setTheme(snapshotHostTheme());
+  }, [resolvedTheme, activeThemeId]);
+
   if (show !== true) return null;
   return <div ref={wrapperRef} style={{ height, minHeight: height }} data-plugin-iframe-slot={`${pluginId}:${slot}`} />;
 }

components/pro/pro-compose-tab-body.tsx

@@ -26,7 +26,10 @@ export function ProComposeTabBody({ tabId, data }: ProComposeTabBodyProps) {
   const client = useAuthStore((s) => s.client);
   const sendEmail = useEmailStore((s) => s.sendEmail);
   const fetchEmails = useEmailStore((s) => s.fetchEmails);
+  const fetchScheduledEmails = useEmailStore((s) => s.fetchScheduledEmails);
+  const refreshScheduledMetadata = useEmailStore((s) => s.refreshScheduledMetadata);
   const selectedMailbox = useEmailStore((s) => s.selectedMailbox);
+  const isScheduledView = useEmailStore((s) => s.isScheduledView);
   const closeTab = useProTabStore((s) => s.closeTab);
   const updateTabTitle = useProTabStore((s) => s.updateTabTitle);
   const updateComposeDraft = useProTabStore((s) => s.updateComposeDraft);
@@ -36,10 +39,18 @@ export function ProComposeTabBody({ tabId, data }: ProComposeTabBodyProps) {
   const tabIdRef = useRef(tabId);
   tabIdRef.current = tabId;
 
+  const handleScheduledSendCreated = useCallback(async () => {
+    if (client) {
+      await refreshScheduledMetadata(client);
+      if (isScheduledView) await fetchScheduledEmails(client);
+    }
+    closeTab(tabIdRef.current);
+  }, [client, refreshScheduledMetadata, isScheduledView, fetchScheduledEmails, closeTab]);
+
   const handleSend = useCallback(async (sendData: Parameters<NonNullable<React.ComponentProps<typeof EmailComposer>['onSend']>>[0]) => {
     if (!client) return;
     try {
-      await sendEmail(
+      const result = await sendEmail(
         client,
         sendData.to,
         sendData.subject,
@@ -54,9 +65,15 @@ export function ProComposeTabBody({ tabId, data }: ProComposeTabBodyProps) {
         sendData.attachments,
         sendData.inReplyTo,
         sendData.references,
+        sendData.delayedUntil,
         sendData.envelopeMailFrom,
       );
 
+      if (result.scheduled) {
+        await handleScheduledSendCreated();
+        return;
+      }
+
       // Mark the original message as $answered / $forwarded so the standard
       // viewer and list reflect the action (same behaviour as inline compose).
       if (data.sourceEmailId && (data.mode === 'reply' || data.mode === 'replyAll')) {
@@ -81,7 +98,7 @@ export function ProComposeTabBody({ tabId, data }: ProComposeTabBodyProps) {
       console.error('Failed to send email:', error);
       toast.error(t('notifications.error_sending'));
     }
-  }, [client, sendEmail, fetchEmails, selectedMailbox, closeTab, data.sourceEmailId, data.mode, t]);
+  }, [client, sendEmail, fetchEmails, selectedMailbox, closeTab, data.sourceEmailId, data.mode, t, handleScheduledSendCreated]);
 
   const handleClose = useCallback(() => {
     closeTab(tabIdRef.current);
@@ -125,6 +142,7 @@ export function ProComposeTabBody({ tabId, data }: ProComposeTabBodyProps) {
           initialDraftText={data.initialDraftText}
           initialData={data.initialData}
           onSend={handleSend}
+          onScheduledSendCreated={handleScheduledSendCreated}
           onClose={handleClose}
           onDiscardDraft={handleDiscardDraft}
           onSaveState={handleSaveState}

components/pro/pro-email-tab-body.tsx

@@ -10,6 +10,7 @@ import { useSettingsStore } from "@/stores/settings-store";
 import { toast } from "@/stores/toast-store";
 import { useProTabStore, type ProEmailTabData, type ProReplyContext } from "@/stores/pro-tab-store";
 import type { Email } from "@/lib/jmap/types";
+import { buildReplySubject, buildForwardSubject } from "@/lib/subject-prefix";
 
 interface ProEmailTabBodyProps {
   tabId: string;
@@ -104,7 +105,7 @@ export function ProEmailTabBody({ tabId, data }: ProEmailTabBodyProps) {
       replyTo: buildReplyContext(email),
       sourceEmailId: email.id,
       initialDraftText: draftText,
-      title: `Re: ${email.subject || t('email_composer.new_message')}`,
+      title: buildReplySubject(email.subject || t('email_composer.new_message'), t('email_composer.prefix.reply')),
     });
   }, [email, openComposeTab, t]);
 
@@ -116,7 +117,7 @@ export function ProEmailTabBody({ tabId, data }: ProEmailTabBodyProps) {
       mode: 'replyAll',
       replyTo: buildReplyContext(email),
       sourceEmailId: email.id,
-      title: `Re: ${email.subject || t('email_composer.new_message')}`,
+      title: buildReplySubject(email.subject || t('email_composer.new_message'), t('email_composer.prefix.reply')),
     });
   }, [email, openComposeTab, t]);
 
@@ -128,7 +129,7 @@ export function ProEmailTabBody({ tabId, data }: ProEmailTabBodyProps) {
       mode: 'forward',
       replyTo: buildReplyContext(email),
       sourceEmailId: email.id,
-      title: `Fwd: ${email.subject || t('email_composer.new_message')}`,
+      title: buildForwardSubject(email.subject || t('email_composer.new_message'), t('email_composer.prefix.forward')),
     });
   }, [email, openComposeTab, t]);
 

components/pwa-install-prompt.tsx

@@ -1,8 +1,10 @@
 "use client";
 
 import { useEffect, useState } from "react";
+import { useTranslations } from "next-intl";
 import { X, Download } from "lucide-react";
 import { useConfig } from "@/hooks/use-config";
+import { withBasePath } from "@/lib/browser-navigation";
 
 interface BeforeInstallPromptEvent extends Event {
   prompt: () => Promise<void>;
@@ -16,6 +18,7 @@ export function PWAInstallPrompt() {
     useState<BeforeInstallPromptEvent | null>(null);
   const [showPrompt, setShowPrompt] = useState(false);
   const { appName, faviconUrl, appLogoLightUrl, appLogoDarkUrl } = useConfig();
+  const t = useTranslations("pwa_install");
 
   useEffect(() => {
     if (localStorage.getItem(DISMISSED_KEY)) return;
@@ -58,7 +61,8 @@ export function PWAInstallPrompt() {
     return null;
   }
 
-  const logoSrc = appLogoLightUrl || faviconUrl;
+  const logoSrc = withBasePath(appLogoLightUrl || faviconUrl);
+  const darkLogoSrc = withBasePath(appLogoDarkUrl || faviconUrl);
 
   return (
     <div className="fixed bottom-4 right-4 z-50 bg-white dark:bg-neutral-900 rounded-lg shadow-lg border border-neutral-200 dark:border-neutral-800 p-4 max-w-sm animate-in slide-in-from-bottom-4">
@@ -75,24 +79,24 @@ export function PWAInstallPrompt() {
           )}
           {logoSrc && (
             <img
-              src={appLogoDarkUrl || faviconUrl}
+              src={darkLogoSrc}
               alt={appName}
               className="w-8 h-8 shrink-0 object-contain hidden dark:block"
             />
           )}
           <div>
             <h3 className="font-semibold text-sm text-neutral-900 dark:text-white">
-              Install {appName}
+              {t("title", { appName })}
             </h3>
             <p className="text-xs text-neutral-600 dark:text-neutral-400 mt-1">
-              Install our app for quick access and offline support.
+              {t("description")}
             </p>
           </div>
         </div>
         <button
           onClick={handleDismiss}
           className="text-neutral-400 hover:text-neutral-600 dark:hover:text-neutral-300 transition-colors"
-          aria-label="Dismiss install prompt"
+          aria-label={t("dismiss_aria")}
         >
           <X className="w-4 h-4" />
         </button>
@@ -103,20 +107,20 @@ export function PWAInstallPrompt() {
             onClick={handleDismiss}
             className="flex-1 px-3 py-2 text-sm font-medium text-neutral-700 dark:text-neutral-300 bg-neutral-100 dark:bg-neutral-800 rounded hover:bg-neutral-200 dark:hover:bg-neutral-700 transition-colors"
           >
-            Not now
+            {t("not_now")}
           </button>
           <button
             onClick={handleInstall}
             className="flex-1 px-3 py-2 text-sm font-medium text-white bg-blue-600 rounded hover:bg-blue-700 transition-colors"
           >
-            Install
+            {t("install")}
           </button>
         </div>
         <button
           onClick={handleDismissForever}
           className="w-full text-xs text-neutral-400 hover:text-neutral-600 dark:hover:text-neutral-300 transition-colors text-center"
         >
-          Don&apos;t remind me again
+          {t("dont_remind")}
         </button>
       </div>
     </div>

components/settings/about-data-settings.tsx

@@ -10,6 +10,7 @@ import { usePolicyStore } from '@/stores/policy-store';
 import { useUpdateStore } from '@/stores/update-store';
 import { ExternalLink } from 'lucide-react';
 import { cn } from '@/lib/utils';
+import { getPathPrefix } from '@/lib/browser-navigation';
 import { SpamSiegeGame } from './spam-siege-game';
 
 const APP_VERSION = process.env.NEXT_PUBLIC_APP_VERSION || "0.0.0";
@@ -123,12 +124,12 @@ export function AboutDataSettings() {
           <button onClick={handleLogoClick} className="flex items-center gap-4 flex-1 text-left focus:outline-none group/about cursor-pointer" aria-label="About">
             <div className="shrink-0">
               <img
-                src="/branding/Bulwark_Logo_Color.svg"
+                src={`${getPathPrefix()}/branding/Bulwark_Logo_Color.svg`}
                 alt="Bulwark"
                 className="w-12 h-12 object-contain dark:hidden group-hover/about:scale-105 group-active/about:scale-95 transition-transform"
               />
               <img
-                src="/branding/Bulwark_Logo_White.svg"
+                src={`${getPathPrefix()}/branding/Bulwark_Logo_White.svg`}
                 alt="Bulwark"
                 className="w-12 h-12 object-contain hidden dark:block group-hover/about:scale-105 group-active/about:scale-95 transition-transform"
               />

components/settings/calendar-management-settings.tsx

@@ -15,25 +15,7 @@ import { ICalImportModal } from '@/components/calendar/ical-import-modal';
 import { ICalSubscriptionModal } from '@/components/calendar/ical-subscription-modal';
 import { useSettingsStore } from '@/stores/settings-store';
 import { apiFetch } from '@/lib/browser-navigation';
-
+import { CALENDAR_COLORS, sharedCalendarColorKey } from '@/lib/shared-calendar-colors';
-const CALENDAR_COLORS = [
-  "#3b82f6", // blue
-  "#ef4444", // red
-  "#22c55e", // green
-  "#f59e0b", // amber
-  "#8b5cf6", // violet
-  "#ec4899", // pink
-  "#14b8a6", // teal
-  "#f97316", // orange
-  "#06b6d4", // cyan
-  "#84cc16", // lime
-  "#6366f1", // indigo
-  "#a855f7", // purple
-  "#e11d48", // rose
-  "#0ea5e9", // sky
-  "#10b981", // emerald
-  "#d946ef", // fuchsia
-];
 
 function CalendarColorPicker({
   value,
@@ -182,6 +164,8 @@ export function CalendarManagementSettings() {
   const tImport = useTranslations('calendar.import');
   const tSub = useTranslations('calendar.subscription');
   const timeFormat = useSettingsStore((s) => s.timeFormat);
+  const sharedCalendarColors = useSettingsStore((s) => s.sharedCalendarColors);
+  const setSharedCalendarColor = useSettingsStore((s) => s.setSharedCalendarColor);
   const colorPickerRef = useRef<HTMLDivElement>(null);
 
   // Load calendars if not yet loaded
@@ -329,6 +313,15 @@ export function CalendarManagementSettings() {
 
   const handleColorChange = async (calendarId: string, color: string) => {
     if (!client) return;
+    // Shared calendars: recolor locally only - the viewer usually can't write
+    // the owner's calendar and it'd recolor it for everyone (see #345).
+    const cal = calendars.find((c) => c.id === calendarId);
+    if (cal?.isShared) {
+      setSharedCalendarColor(sharedCalendarColorKey(cal), color);
+      toast.success(t('color_updated'));
+      setColorPickerId(null);
+      return;
+    }
     try {
       await updateCalendar(client, calendarId, { color });
       toast.success(t('color_updated'));
@@ -396,7 +389,7 @@ export function CalendarManagementSettings() {
     <SettingsSection title={t('title')} description={t('description')}>
       <div className="space-y-2">
         {calendars.filter(cal => !isSubscriptionCalendar(cal.id)).map((cal) => {
-          const color = cal.color || '#3b82f6';
+          const color = (cal.isShared && sharedCalendarColors[sharedCalendarColorKey(cal)]) || cal.color || '#3b82f6';
 
           if (editingId === cal.id) {
             return (

components/settings/calendar-settings.tsx

@@ -4,17 +4,14 @@ import { useTranslations } from 'next-intl';
 import { useCalendarStore, CalendarViewMode } from '@/stores/calendar-store';
 import { useSettingsStore } from '@/stores/settings-store';
 import { usePolicyStore } from '@/stores/policy-store';
-import { SettingsSection, SettingItem, Select, RadioGroup, ToggleSwitch } from './settings-section';
+import { SettingsSection, SettingItem, Select, ToggleSwitch } from './settings-section';
 
 export function CalendarSettings() {
   const t = useTranslations('calendar.settings');
   const tViews = useTranslations('calendar.views');
-  const tDays = useTranslations('calendar.days');
 
   const { viewMode, setViewMode } = useCalendarStore();
   const {
-    timeFormat,
-    firstDayOfWeek,
     showTimeInMonthView,
     showWeekNumbers,
     enableCalendarTasks,
@@ -40,28 +37,6 @@ export function CalendarSettings() {
         />
       </SettingItem>
 
-      <SettingItem label={t('week_starts_on')}>
-        <Select
-          value={firstDayOfWeek.toString()}
-          onChange={(value) => updateSetting('firstDayOfWeek', parseInt(value) as 0 | 1)}
-          options={[
-            { value: '1', label: tDays('monday') },
-            { value: '0', label: tDays('sunday') },
-          ]}
-        />
-      </SettingItem>
-
-      <SettingItem label={t('time_format')}>
-        <RadioGroup
-          value={timeFormat}
-          onChange={(value) => updateSetting('timeFormat', value as '12h' | '24h')}
-          options={[
-            { value: '12h', label: t('time_format_12h') },
-            { value: '24h', label: t('time_format_24h') },
-          ]}
-        />
-      </SettingItem>
-
       <SettingItem
         label={t('show_time_in_month_view')}
         description={t('show_time_in_month_view_desc')}

components/settings/composing-settings.tsx

@@ -3,6 +3,8 @@
 import { useState } from 'react';
 import { useTranslations } from 'next-intl';
 import { useSettingsStore } from '@/stores/settings-store';
+import type { SendDelaySeconds } from '@/stores/settings-store';
+import { useAuthStore } from '@/stores/auth-store';
 import { SettingsSection, SettingItem, Select, ToggleSwitch } from './settings-section';
 import { X } from 'lucide-react';
 import {
@@ -22,11 +24,16 @@ export function ComposingSettings() {
     autoSelectReplyIdentity,
     attachmentReminderEnabled,
     attachmentReminderKeywords,
+    sendDelaySeconds,
     subAddressDelimiter,
     signaturePosition,
     signatureSeparatorEnabled,
+    requestReadReceiptDefault,
+    readReceiptResponse,
     updateSetting,
   } = useSettingsStore();
+  const { client } = useAuthStore();
+  const delayedSendSupported = client?.hasDelayedSend() ?? false;
 
   return (
     <SettingsSection title={t('title')} description={t('description')}>
@@ -37,6 +44,24 @@ export function ComposingSettings() {
         />
       </SettingItem>
 
+      <SettingItem label={t('send_delay.label')} description={t('send_delay.description')}>
+        <div className="flex flex-col items-end gap-1">
+          <Select
+            value={String(sendDelaySeconds)}
+            onChange={(value) => updateSetting('sendDelaySeconds', Number(value) as SendDelaySeconds)}
+            options={[
+              { value: '0', label: t('send_delay.off') },
+              { value: '10', label: t('send_delay.seconds', { seconds: 10 }) },
+              { value: '30', label: t('send_delay.seconds', { seconds: 30 }) },
+              { value: '60', label: t('send_delay.seconds', { seconds: 60 }) },
+            ]}
+          />
+          {sendDelaySeconds > 0 && !delayedSendSupported && (
+            <p className="max-w-64 text-right text-xs text-amber-600 dark:text-amber-400">{t('send_delay.unsupported')}</p>
+          )}
+        </div>
+      </SettingItem>
+
       <SettingItem label={t('signature_position.label')} description={t('signature_position.description')}>
         <Select
           value={signaturePosition}
@@ -55,6 +80,25 @@ export function ComposingSettings() {
         />
       </SettingItem>
 
+      <SettingItem label={t('request_read_receipt.label')} description={t('request_read_receipt.description')}>
+        <ToggleSwitch
+          checked={requestReadReceiptDefault}
+          onChange={(checked) => updateSetting('requestReadReceiptDefault', checked)}
+        />
+      </SettingItem>
+
+      <SettingItem label={t('read_receipt_response.label')} description={t('read_receipt_response.description')}>
+        <Select
+          value={readReceiptResponse}
+          onChange={(value) => updateSetting('readReceiptResponse', value as 'ask' | 'always' | 'never')}
+          options={[
+            { value: 'ask', label: t('read_receipt_response.ask') },
+            { value: 'always', label: t('read_receipt_response.always') },
+            { value: 'never', label: t('read_receipt_response.never') },
+          ]}
+        />
+      </SettingItem>
+
       <SettingItem
         label={t('sub_address_delimiter.label')}
         description={t('sub_address_delimiter.description', { delimiter: subAddressDelimiter })}

components/settings/downloads-settings.tsx

@@ -0,0 +1,266 @@
+"use client";
+
+import { useMemo, useRef } from "react";
+import { useTranslations } from "next-intl";
+import { useSettingsStore } from "@/stores/settings-store";
+import { SettingsSection, SettingItem, Select, ToggleSwitch } from "./settings-section";
+import { RotateCcw } from "lucide-react";
+import { cn } from "@/lib/utils";
+import {
+  DEFAULT_ATTACHMENT_TEMPLATE,
+  DEFAULT_BUNDLE_TEMPLATE,
+  DEFAULT_EMAIL_TEMPLATE,
+  EMAIL_TOKENS,
+  ATTACHMENT_TOKENS,
+  BUNDLE_TOKENS,
+  bundleExportFilename,
+  emailExportFilename,
+  attachmentDownloadFilename,
+  buildSampleEmail,
+  type EmailFilenameOptions,
+} from "@/lib/download-filename";
+
+function insertTokenAtCursor(
+  input: HTMLInputElement,
+  token: string,
+  current: string,
+  onChange: (next: string) => void,
+): void {
+  const start = input.selectionStart ?? current.length;
+  const end = input.selectionEnd ?? current.length;
+  const before = current.slice(0, start);
+  const after = current.slice(end);
+  const insertion = `{${token}}`;
+  const next = `${before}${insertion}${after}`;
+  onChange(next);
+  // Restore focus and place caret after the inserted token.
+  requestAnimationFrame(() => {
+    input.focus();
+    const caret = before.length + insertion.length;
+    input.setSelectionRange(caret, caret);
+  });
+}
+
+interface TemplateEditorProps {
+  label: string;
+  description: string;
+  value: string;
+  defaultValue: string;
+  tokens: { token: string; description: string }[];
+  preview: string;
+  onChange: (next: string) => void;
+  resetLabel: string;
+  previewLabel: string;
+  placeholder?: string;
+}
+
+function TemplateEditor({
+  label,
+  description,
+  value,
+  defaultValue,
+  tokens,
+  preview,
+  onChange,
+  resetLabel,
+  previewLabel,
+  placeholder,
+}: TemplateEditorProps) {
+  const inputRef = useRef<HTMLInputElement>(null);
+  return (
+    <div data-search-label={label} className="space-y-3 py-3 border-b border-border last:border-0">
+      <div>
+        <label className="text-sm font-medium text-foreground">{label}</label>
+        <p className="text-xs text-muted-foreground mt-1">{description}</p>
+      </div>
+      <div className="flex flex-col gap-2">
+        <div className="flex items-stretch gap-2">
+          <input
+            ref={inputRef}
+            type="text"
+            value={value}
+            placeholder={placeholder}
+            onChange={(e) => onChange(e.target.value)}
+            spellCheck={false}
+            className="flex-1 px-3 py-1.5 text-sm rounded-md bg-muted border border-border text-foreground font-mono focus:outline-none focus:ring-2 focus:ring-ring transition-colors duration-150"
+          />
+          <button
+            type="button"
+            onClick={() => onChange(defaultValue)}
+            disabled={value === defaultValue}
+            title={resetLabel}
+            className={cn(
+              "px-2 rounded-md border border-border text-foreground transition-colors duration-150",
+              value === defaultValue
+                ? "opacity-40 cursor-not-allowed"
+                : "hover:bg-muted cursor-pointer",
+            )}
+          >
+            <RotateCcw className="w-4 h-4" />
+          </button>
+        </div>
+        <div className="flex flex-wrap gap-1.5">
+          {tokens.map((t) => (
+            <button
+              key={t.token}
+              type="button"
+              title={t.description}
+              onClick={() => {
+                const input = inputRef.current;
+                if (!input) {
+                  onChange(`${value}{${t.token}}`);
+                  return;
+                }
+                insertTokenAtCursor(input, t.token, value, onChange);
+              }}
+              className="px-2 py-0.5 text-xs font-mono rounded bg-muted hover:bg-accent border border-border text-foreground transition-colors duration-150 cursor-pointer"
+            >
+              {`{${t.token}}`}
+            </button>
+          ))}
+        </div>
+        <div className="text-xs text-muted-foreground">
+          <span className="opacity-70">{previewLabel} </span>
+          <span className="font-mono text-foreground/90 break-all">{preview}</span>
+        </div>
+      </div>
+    </div>
+  );
+}
+
+export function DownloadsSettings() {
+  const t = useTranslations("settings.downloads");
+  const {
+    emailDownloadTemplate,
+    attachmentDownloadTemplate,
+    bundleDownloadTemplate,
+    filenameSpaceReplacement,
+    filenameLowercase,
+    filenameStripDiacritics,
+    filenameCollapseSeparators,
+    postExportAction,
+    updateSetting,
+  } = useSettingsStore();
+
+  const sampleEmail = useMemo(() => buildSampleEmail(), []);
+  const sampleAttachment = useMemo(() => ({ name: "Invoice-2026-05.pdf", type: "application/pdf" }), []);
+
+  const transform = useMemo(
+    () => ({
+      spaceReplacement: filenameSpaceReplacement,
+      lowercase: filenameLowercase,
+      stripDiacritics: filenameStripDiacritics,
+      collapseSeparators: filenameCollapseSeparators,
+    }),
+    [filenameSpaceReplacement, filenameLowercase, filenameStripDiacritics, filenameCollapseSeparators],
+  );
+
+  const emailOptions: EmailFilenameOptions = useMemo(
+    () => ({ ...transform, template: emailDownloadTemplate || DEFAULT_EMAIL_TEMPLATE }),
+    [transform, emailDownloadTemplate],
+  );
+  const attachmentOptions: EmailFilenameOptions = useMemo(
+    () => ({ ...transform, template: attachmentDownloadTemplate || DEFAULT_ATTACHMENT_TEMPLATE }),
+    [transform, attachmentDownloadTemplate],
+  );
+  const bundleOptions: EmailFilenameOptions = useMemo(
+    () => ({ ...transform, template: bundleDownloadTemplate || DEFAULT_BUNDLE_TEMPLATE }),
+    [transform, bundleDownloadTemplate],
+  );
+
+  const emlPreview = useMemo(
+    () => emailExportFilename(sampleEmail, emailOptions),
+    [sampleEmail, emailOptions],
+  );
+  const attachmentPreview = useMemo(
+    () => attachmentDownloadFilename(sampleEmail, sampleAttachment, attachmentOptions),
+    [sampleEmail, sampleAttachment, attachmentOptions],
+  );
+  const bundlePreview = useMemo(
+    // Render with the email's fixed sample date so the preview is stable as the
+    // user types in the template field.
+    () => bundleExportFilename(3, bundleOptions, sampleEmail.receivedAt ?? undefined),
+    [bundleOptions, sampleEmail],
+  );
+
+  return (
+    <SettingsSection title={t("title")} description={t("description")}>
+      <TemplateEditor
+        label={t("email_template.label")}
+        description={t("email_template.description")}
+        value={emailDownloadTemplate}
+        defaultValue={DEFAULT_EMAIL_TEMPLATE}
+        tokens={EMAIL_TOKENS}
+        preview={emlPreview}
+        onChange={(next) => updateSetting("emailDownloadTemplate", next)}
+        resetLabel={t("reset")}
+        previewLabel={t("preview")}
+        placeholder={DEFAULT_EMAIL_TEMPLATE}
+      />
+      <TemplateEditor
+        label={t("attachment_template.label")}
+        description={t("attachment_template.description")}
+        value={attachmentDownloadTemplate}
+        defaultValue={DEFAULT_ATTACHMENT_TEMPLATE}
+        tokens={ATTACHMENT_TOKENS}
+        preview={attachmentPreview}
+        onChange={(next) => updateSetting("attachmentDownloadTemplate", next)}
+        resetLabel={t("reset")}
+        previewLabel={t("preview")}
+        placeholder={DEFAULT_ATTACHMENT_TEMPLATE}
+      />
+      <TemplateEditor
+        label={t("bundle_template.label")}
+        description={t("bundle_template.description")}
+        value={bundleDownloadTemplate}
+        defaultValue={DEFAULT_BUNDLE_TEMPLATE}
+        tokens={BUNDLE_TOKENS}
+        preview={bundlePreview}
+        onChange={(next) => updateSetting("bundleDownloadTemplate", next)}
+        resetLabel={t("reset")}
+        previewLabel={t("preview")}
+        placeholder={DEFAULT_BUNDLE_TEMPLATE}
+      />
+      <SettingItem label={t("spaces.label")} description={t("spaces.description")}>
+        <Select
+          value={filenameSpaceReplacement}
+          onChange={(value) => updateSetting("filenameSpaceReplacement", value as "keep" | "underscore" | "dash")}
+          options={[
+            { value: "keep", label: t("spaces.keep") },
+            { value: "underscore", label: t("spaces.underscore") },
+            { value: "dash", label: t("spaces.dash") },
+          ]}
+        />
+      </SettingItem>
+      <SettingItem label={t("lowercase.label")} description={t("lowercase.description")}>
+        <ToggleSwitch
+          checked={filenameLowercase}
+          onChange={(checked) => updateSetting("filenameLowercase", checked)}
+        />
+      </SettingItem>
+      <SettingItem label={t("strip_diacritics.label")} description={t("strip_diacritics.description")}>
+        <ToggleSwitch
+          checked={filenameStripDiacritics}
+          onChange={(checked) => updateSetting("filenameStripDiacritics", checked)}
+        />
+      </SettingItem>
+      <SettingItem label={t("collapse_separators.label")} description={t("collapse_separators.description")}>
+        <ToggleSwitch
+          checked={filenameCollapseSeparators}
+          onChange={(checked) => updateSetting("filenameCollapseSeparators", checked)}
+        />
+      </SettingItem>
+      <SettingItem label={t("after_export.label")} description={t("after_export.description")}>
+        <Select
+          value={postExportAction}
+          onChange={(value) => updateSetting("postExportAction", value as "keep" | "archive" | "trash")}
+          options={[
+            { value: "keep", label: t("after_export.keep") },
+            { value: "archive", label: t("after_export.archive") },
+            { value: "trash", label: t("after_export.trash") },
+          ]}
+        />
+      </SettingItem>
+    </SettingsSection>
+  );
+}

components/settings/files-settings.tsx

@@ -6,6 +6,7 @@ import { Folder, FolderOpen, FileText, FileCode, ImageIcon, FileAudio, File, Hom
 import { SettingsSection, SettingItem, ToggleSwitch, RadioGroup } from "./settings-section";
 import { loadFilesSettings, saveFilesSettings, type FilesSettings, type FolderLayout } from "@/components/files/files-settings-dialog";
 import { cn } from "@/lib/utils";
+import { withBasePath } from "@/lib/browser-navigation";
 
 interface SampleFile {
   name: string;
@@ -95,7 +96,7 @@ function FilesSettingsPreview({ settings }: { settings: FilesSettings }) {
           )}
         >
           {settings.showThumbnails && file.thumbnailUrl ? (
-            <img src={file.thumbnailUrl} alt="" className="w-4 h-4 rounded object-cover flex-shrink-0" />
+            <img src={withBasePath(file.thumbnailUrl)} alt="" className="w-4 h-4 rounded object-cover flex-shrink-0" />
           ) : settings.showIcons ? (
             getPreviewIcon(file, settings.coloredIcons, "sm")
           ) : null}
@@ -125,7 +126,7 @@ function FilesSettingsPreview({ settings }: { settings: FilesSettings }) {
             )}
           >
             {settings.showThumbnails && file.thumbnailUrl ? (
-              <img src={file.thumbnailUrl} alt="" className="w-8 h-8 rounded object-cover flex-shrink-0" />
+              <img src={withBasePath(file.thumbnailUrl)} alt="" className="w-8 h-8 rounded object-cover flex-shrink-0" />
             ) : settings.showIcons ? (
               getPreviewIcon(file, settings.coloredIcons, "lg")
             ) : (

components/settings/filter-settings.tsx

@@ -36,7 +36,17 @@ function RuleSummary({ rule }: { rule: FilterRule }) {
   const conditions = rule.conditions.slice(0, 2).map((c) => {
     const field = t(`condition_fields.${c.field}`);
     const comparator = t(`comparators.${c.comparator}`);
-    return `${field} ${comparator} "${c.value}"`;
+    // has_any is a no-value test ("attachment is present"); appending
+    // `""` would look broken in the summary line.
+    if (c.field === "attachment" && c.comparator === "has_any") {
+      return `${field} ${comparator}`;
+    }
+    // Multi-value conditions render as "a" / "b" / "c" with the locale's
+    // OR-glue between items so the line still reads as natural language.
+    const valueStr = Array.isArray(c.value)
+      ? c.value.map((v) => `"${v}"`).join(` ${t("or")} `)
+      : `"${c.value}"`;
+    return `${field} ${comparator} ${valueStr}`;
   });
 
   const joiner = rule.matchType === "all" ? t("and") : t("or");
@@ -97,7 +107,22 @@ function VisualRuleSummary({ rule }: { rule: FilterRule }) {
               <span className="inline-flex items-baseline gap-1 px-1.5 py-px rounded-sm bg-muted/60 text-foreground">
                 <span className="font-medium text-blue-600 dark:text-blue-400">{field}</span>
                 <span className="text-muted-foreground">{comparator}</span>
-                <span className="text-foreground">“{c.value}”</span>
+                {!(c.field === "attachment" && c.comparator === "has_any") && (
+                  <span className="text-foreground">
+                    {Array.isArray(c.value)
+                      ? c.value.map((v, k) => (
+                          <span key={k}>
+                            {k > 0 && (
+                              <span className="text-muted-foreground/70 italic mx-0.5">
+                                {t("or")}
+                              </span>
+                            )}
+                            “{v}”
+                          </span>
+                        ))
+                      : <>“{c.value}”</>}
+                  </span>
+                )}
               </span>
             </span>
           );

components/settings/language-settings.tsx

@@ -1,17 +1,100 @@
 "use client";
 
+import { useMemo } from 'react';
 import { useTranslations } from 'next-intl';
 import { LanguageSwitcher } from '@/components/ui/language-switcher';
-import { SettingsSection, SettingItem } from './settings-section';
+import { useLocaleStore } from '@/stores/locale-store';
+import { useSettingsStore } from '@/stores/settings-store';
+import type { DateFormat, TimeFormat, FirstDayOfWeek } from '@/stores/settings-store';
+import { formatDate } from '@/lib/utils';
+import { SettingsSection, SettingItem, Select, RadioGroup } from './settings-section';
 
 export function LanguageSettings() {
-  const t = useTranslations('settings.appearance');
+  const t = useTranslations('settings.language_region');
+  const tDays = useTranslations('calendar.days');
+
+  const { dateFormat, timeFormat, firstDayOfWeek, updateSetting } = useSettingsStore();
+
+  // Subscribe to locale changes so the preview re-renders on language switch
+  // (formatDate reads it via getState() and would otherwise stay stale).
+  const locale = useLocaleStore((s) => s.locale);
+
+  const preview = useMemo(() => {
+    // Build sample timestamps for each bucket so users see what their pick
+    // will look like in practice. Use offsets relative to "now" so the
+    // bucketing is stable even though the wall-clock keeps moving.
+    void locale; void dateFormat; void timeFormat;
+    const now = new Date();
+    const today = new Date(now);
+    today.setHours(15, 31, 0, 0);
+    const thisWeek = new Date(now);
+    thisWeek.setDate(now.getDate() - 2);
+    thisWeek.setHours(15, 31, 0, 0);
+    const older = new Date(now);
+    older.setMonth(now.getMonth() - 2);
+    older.setHours(15, 31, 0, 0);
+    return {
+      today: formatDate(today),
+      thisWeek: formatDate(thisWeek),
+      older: formatDate(older),
+    };
+  }, [locale, dateFormat, timeFormat]);
 
   return (
-    <SettingsSection title={t('language.label')} description={t('language.description')}>
+    <SettingsSection title={t('title')} description={t('description')}>
       <SettingItem label={t('language.label')} description={t('language.description')}>
         <LanguageSwitcher />
       </SettingItem>
+
+      <SettingItem label={t('date_format.label')} description={t('date_format.description')}>
+        <div className="flex flex-col items-end gap-2">
+          <Select
+            value={dateFormat}
+            onChange={(value) => updateSetting('dateFormat', value as DateFormat)}
+            options={[
+              { value: 'smart', label: t('date_format.smart') },
+              { value: 'relative', label: t('date_format.relative') },
+              { value: 'full', label: t('date_format.full') },
+            ]}
+          />
+          <div className="text-xs text-muted-foreground text-right space-y-0.5 font-mono">
+            <div>
+              <span className="opacity-70">{t('date_format.preview_today')} </span>
+              <span className="text-foreground/90">{preview.today}</span>
+            </div>
+            <div>
+              <span className="opacity-70">{t('date_format.preview_this_week')} </span>
+              <span className="text-foreground/90">{preview.thisWeek}</span>
+            </div>
+            <div>
+              <span className="opacity-70">{t('date_format.preview_older')} </span>
+              <span className="text-foreground/90">{preview.older}</span>
+            </div>
+          </div>
+        </div>
+      </SettingItem>
+
+      <SettingItem label={t('time_format.label')} description={t('time_format.description')}>
+        <RadioGroup
+          value={timeFormat}
+          onChange={(value) => updateSetting('timeFormat', value as TimeFormat)}
+          options={[
+            { value: '12h', label: t('time_format.12h') },
+            { value: '24h', label: t('time_format.24h') },
+          ]}
+        />
+      </SettingItem>
+
+      <SettingItem label={t('first_day.label')} description={t('first_day.description')}>
+        <Select
+          value={firstDayOfWeek.toString()}
+          onChange={(value) => updateSetting('firstDayOfWeek', parseInt(value) as FirstDayOfWeek)}
+          options={[
+            { value: '1', label: tDays('monday') },
+            { value: '0', label: tDays('sunday') },
+          ]}
+        />
+      </SettingItem>
     </SettingsSection>
   );
 }

components/settings/layout-settings.tsx

@@ -1,11 +1,13 @@
 "use client";
 
+import { useMemo } from 'react';
 import { useTranslations } from 'next-intl';
 import { useSettingsStore, type ToolbarPosition, type MailLayout } from '@/stores/settings-store';
 import { SettingsSection, SettingItem, RadioGroup, ToggleSwitch } from './settings-section';
 import { cn } from '@/lib/utils';
 import { usePolicyStore } from '@/stores/policy-store';
 import { useAccountStore } from '@/stores/account-store';
+import { useEmailStore } from '@/stores/email-store';
 
 const MAIL_LAYOUT_PREVIEW_ROWS = [
   { sender: 'Alice', subject: 'Quarterly roadmap', preview: 'The draft is ready for review.', selected: false },
@@ -115,9 +117,11 @@ function MailLayoutPreview({
 export function LayoutSettings() {
   const t = useTranslations('settings.appearance');
   const tEmail = useTranslations('settings.email_behavior');
-  const { toolbarPosition, showToolbarLabels, hideAccountSwitcher, showRailAccountList, enableUnifiedMailbox, colorfulSidebarIcons, mailLayout, proInterface, updateSetting } = useSettingsStore();
+  const { toolbarPosition, showToolbarLabels, hideAccountSwitcher, showRailAccountList, enableUnifiedMailbox, includeGroupInUnified, colorfulSidebarIcons, mailLayout, proInterface, updateSetting } = useSettingsStore();
   const { isSettingLocked, isSettingHidden } = usePolicyStore();
   const accounts = useAccountStore(s => s.accounts);
+  const mailboxes = useEmailStore(s => s.mailboxes);
+  const hasGroupInboxes = useMemo(() => mailboxes.some(m => m.isShared), [mailboxes]);
 
   return (
     <SettingsSection title={t('title')} description={t('description')}>
@@ -177,10 +181,11 @@ export function LayoutSettings() {
         />
       </SettingItem>
 
-      {accounts.length > 1 && (
+      {(accounts.length > 1 || hasGroupInboxes) && !isSettingHidden('enableUnifiedMailbox') && (
         <SettingItem
           label={t('unified_mailbox.label')}
           description={t('unified_mailbox.description')}
+          locked={isSettingLocked('enableUnifiedMailbox')}
         >
           <ToggleSwitch
             checked={enableUnifiedMailbox}
@@ -189,6 +194,21 @@ export function LayoutSettings() {
         </SettingItem>
       )}
 
+      {enableUnifiedMailbox && hasGroupInboxes && !isSettingHidden('includeGroupInUnified') && (
+        <div className="ml-4 border-l-2 border-border pl-4 -mt-2">
+          <SettingItem
+            label={t('unified_mailbox.include_group.label')}
+            description={t('unified_mailbox.include_group.description')}
+            locked={isSettingLocked('includeGroupInUnified')}
+          >
+            <ToggleSwitch
+              checked={includeGroupInUnified}
+              onChange={(v) => updateSetting('includeGroupInUnified', v)}
+            />
+          </SettingItem>
+        </div>
+      )}
+
       <SettingItem label={t('pro_interface.label')} description={t('pro_interface.description')}>
         <ToggleSwitch
           checked={proInterface}

components/settings/notification-settings.tsx

@@ -7,7 +7,7 @@ import { SettingsSection, SettingItem, ToggleSwitch, Select } from './settings-s
 import { playNotificationSound, NOTIFICATION_SOUNDS } from '@/lib/notification-sound';
 import type { NotificationSoundChoice } from '@/lib/notification-sound';
 import { Button } from '@/components/ui/button';
-import { CheckCircle2, Volume2, XCircle } from 'lucide-react';
+import { CheckCircle2, Lock, Volume2, XCircle } from 'lucide-react';
 import { usePolicyStore } from '@/stores/policy-store';
 import { useAuthStore } from '@/stores/auth-store';
 import { ConfirmDialog } from '@/components/ui/confirm-dialog';
@@ -40,16 +40,30 @@ export function NotificationSettings() {
     updateSetting,
   } = useSettingsStore();
   const { isSettingLocked, isSettingHidden } = usePolicyStore();
+  const adminPushRelayUrl = usePolicyStore((s) => s.policy.pushRelayUrl);
+  const pushRelayLocked = usePolicyStore((s) => s.policy.pushRelayUrlLocked) === true;
   const client = useAuthStore((s) => s.client);
   const username = useAuthStore((s) => s.username);
   const { dialogProps: confirmDialogProps, confirm: confirmDialog } = useConfirmDialog();
 
   const supported = typeof window !== 'undefined' && isWebPushSupported();
-  const [relayUrl, setRelayUrl] = useState(DEFAULT_RELAY_BASE_URL);
+  const adminUrl = (adminPushRelayUrl ?? '').trim();
+  const [relayUrl, setRelayUrl] = useState(adminUrl || DEFAULT_RELAY_BASE_URL);
   const [pushStatus, setPushStatus] = useState<PushStatus>(
     supported ? { kind: 'idle' } : { kind: 'unsupported' },
   );
 
+  // Pull the admin-configured URL into local state when policy loads/changes.
+  // When locked, the admin value always wins; when only set (not locked), use
+  // it as the initial default but let the user override.
+  useEffect(() => {
+    if (pushRelayLocked && adminUrl) {
+      setRelayUrl(adminUrl);
+    } else if (adminUrl) {
+      setRelayUrl((current) => (current === DEFAULT_RELAY_BASE_URL ? adminUrl : current));
+    }
+  }, [adminUrl, pushRelayLocked]);
+
   useEffect(() => {
     if (!supported) return;
     if (!client) return;
@@ -125,12 +139,17 @@ export function NotificationSettings() {
       <SettingsSection title={t('push.title')} description={t('push.description')}>
         <div className="rounded-md border p-4 space-y-3">
           <div className="flex items-center justify-between gap-3">
-            <label className="text-sm font-medium" htmlFor="push-relay-url">
+            <label className="text-sm font-medium inline-flex items-center gap-1.5" htmlFor="push-relay-url">
               {t('push.relay_label')}
+              {pushRelayLocked && (
+                <Lock className="w-3 h-3 text-muted-foreground" aria-label={t('push.relay_locked')} />
+              )}
             </label>
             <PushStatusBadge status={pushStatus} t={t} />
           </div>
-          <p className="text-xs text-muted-foreground">{t('push.relay_desc')}</p>
+          <p className="text-xs text-muted-foreground">
+            {pushRelayLocked ? t('push.relay_locked_desc') : t('push.relay_desc')}
+          </p>
           <input
             id="push-relay-url"
             type="url"
@@ -140,7 +159,8 @@ export function NotificationSettings() {
             value={relayUrl}
             onChange={(e) => setRelayUrl(e.target.value)}
             placeholder={t('push.relay_placeholder')}
-            disabled={busy || pushStatus.kind === 'unsupported'}
+            disabled={busy || pushStatus.kind === 'unsupported' || pushRelayLocked}
+            readOnly={pushRelayLocked}
             className="w-full rounded border bg-background px-3 py-2 text-sm disabled:opacity-50"
           />
           <div className="flex flex-wrap gap-2">

components/settings/reading-settings.tsx

@@ -120,9 +120,10 @@ export function ReadingSettings() {
         <div className="flex flex-col gap-2">
           <Select
             value={deleteAction}
-            onChange={(value) => updateSetting('deleteAction', value as 'trash' | 'permanent')}
+            onChange={(value) => updateSetting('deleteAction', value as 'trash' | 'trash-and-read' | 'permanent')}
             options={[
               { value: 'trash', label: t('delete_action.trash') },
+              { value: 'trash-and-read', label: t('delete_action.trash_and_read') },
               { value: 'permanent', label: t('delete_action.permanent') },
             ]}
           />

components/settings/themes-settings.tsx

@@ -1,10 +1,10 @@
 'use client';
 
-import { useEffect } from 'react';
+import { useEffect, useState } from 'react';
 import { useThemeStore } from '@/stores/theme-store';
 import { SettingsSection } from './settings-section';
 import { cn } from '@/lib/utils';
-import { Check, Palette, Lock } from 'lucide-react';
+import { Check, Lock } from 'lucide-react';
 import { toast } from '@/stores/toast-store';
 import { usePolicyStore } from '@/stores/policy-store';
 
@@ -14,6 +14,18 @@ export function ThemesSettings() {
   const themePolicy = getThemePolicy();
   const forcedThemeId = getForcedThemeId(installedThemes.map((theme) => theme.id));
 
+  // Render each preview in the variant matching the app's current mode, and
+  // keep it in sync when the user toggles light/dark elsewhere.
+  const [isDark, setIsDark] = useState(false);
+  useEffect(() => {
+    const root = document.documentElement;
+    const update = () => setIsDark(root.classList.contains('dark'));
+    update();
+    const obs = new MutationObserver(update);
+    obs.observe(root, { attributes: true, attributeFilter: ['class'] });
+    return () => obs.disconnect();
+  }, []);
+
   // Filter out themes disabled by admin policy
   const visibleThemes = installedThemes.filter(
     theme => !isThemeDisabled(theme.id, !!theme.builtIn)
@@ -36,6 +48,9 @@ export function ThemesSettings() {
   }, [activeThemeId, activateTheme, forcedThemeId, installedThemes, isThemeDisabled]);
 
   const handleActivate = (id: string | null) => {
+    // Clicking the already-active theme is a no-op (no re-apply, no toast).
+    if (id === activeThemeId) return;
+
     if (forcedThemeId && id !== forcedThemeId) {
       const forcedTheme = installedThemes.find((theme) => theme.id === forcedThemeId);
       toast.info(`Theme "${forcedTheme?.name ?? 'Admin theme'}" is forced by admin and cannot be changed`);
@@ -61,6 +76,9 @@ export function ThemesSettings() {
         <ThemeCard
           name="Default"
           author="Bulwark"
+          isDefaultTheme
+          variants={['light', 'dark']}
+          isDark={isDark}
           isActive={activeThemeId === null}
           isBuiltIn
           isDefault={!themePolicy.defaultThemeId}
@@ -77,6 +95,8 @@ export function ThemesSettings() {
               name={theme.name}
               author={theme.author}
               preview={theme.preview}
+              css={theme.css}
+              isDark={isDark}
               isActive={activeThemeId === theme.id}
               isBuiltIn={theme.builtIn}
               isDefault={themePolicy.defaultThemeId === theme.id}
@@ -98,6 +118,9 @@ interface ThemeCardProps {
   name: string;
   author: string;
   preview?: string;
+  css?: string;
+  isDark?: boolean;
+  isDefaultTheme?: boolean;
   isActive: boolean;
   isBuiltIn: boolean;
   isDefault?: boolean;
@@ -107,7 +130,8 @@ interface ThemeCardProps {
   onActivate: () => void;
 }
 
-function ThemeCard({ name, author, preview, isActive, isDefault, isForceEnabled, disabled, variants, onActivate }: ThemeCardProps) {
+function ThemeCard({ name, author, preview, css, isDark, isDefaultTheme, isActive, isDefault, isForceEnabled, disabled, variants, onActivate }: ThemeCardProps) {
+  const colors = resolveThemeColors({ css, variants, isDark: !!isDark, isDefaultTheme: !!isDefaultTheme });
   return (
     <div data-search-label={name} className="relative">
       <button
@@ -122,12 +146,13 @@ function ThemeCard({ name, author, preview, isActive, isDefault, isForceEnabled,
           disabled && !isActive && 'hover:border-border'
         )}
       >
-        {/* Preview / Placeholder */}
+        {/* Preview: marketplace image when shipped, otherwise a mini app
-        <div className="w-full aspect-[16/10] rounded-lg mb-2 overflow-hidden bg-muted flex items-center justify-center">
+            mockup painted from the theme's own colour tokens. */}
+        <div className="w-full aspect-[16/10] rounded-lg mb-2 overflow-hidden bg-muted">
           {preview ? (
             <img src={preview} alt={name} className="w-full h-full object-cover" />
           ) : (
-            <Palette className="w-8 h-8 text-muted-foreground/40" />
+            <ThemePreview colors={colors} />
           )}
         </div>
 
@@ -162,3 +187,141 @@ function ThemeCard({ name, author, preview, isActive, isDefault, isForceEnabled,
     </div>
   );
 }
+
+// ─── Theme Preview ───────────────────────────────────────────
+
+interface ThemeColors {
+  background: string;
+  sidebar: string;
+  card: string;
+  primary: string;
+  primaryForeground: string;
+  foreground: string;
+  mutedForeground: string;
+  border: string;
+}
+
+// The built-in "Default" theme has no `css` of its own (it's the app's base
+// tokens); these mirror app/globals.css so its card previews accurately.
+const DEFAULT_LIGHT: ThemeColors = {
+  background: '#ffffff', sidebar: '#f8fafc', card: '#ffffff', primary: '#3b82f6',
+  primaryForeground: '#ffffff', foreground: '#0f172a', mutedForeground: '#64748b', border: '#e2e8f0',
+};
+const DEFAULT_DARK: ThemeColors = {
+  background: '#0a0a0a', sidebar: '#0a0a0a', card: '#141414', primary: '#fafafa',
+  primaryForeground: '#171717', foreground: '#fafafa', mutedForeground: '#a3a3a3', border: '#262626',
+};
+
+// Pull a handful of structural colour tokens out of a theme's compiled CSS.
+// Themes declare light tokens under `:root { … }` and dark under `.dark { … }`;
+// neither block nests braces, so a non-greedy capture is enough.
+function extractThemeColors(css: string, dark: boolean): ThemeColors | null {
+  const block = css.match(dark ? /\.dark\s*\{([\s\S]*?)\}/ : /:root\s*\{([\s\S]*?)\}/);
+  if (!block) return null;
+  const body = block[1];
+  const get = (name: string): string | undefined => {
+    const m = body.match(new RegExp(`--color-${name}\\s*:\\s*([^;]+);`));
+    return m ? m[1].trim() : undefined;
+  };
+  const background = get('background');
+  if (!background) return null;
+  return {
+    background,
+    sidebar: get('sidebar') ?? background,
+    card: get('card') ?? background,
+    primary: get('primary') ?? '#888888',
+    primaryForeground: get('primary-foreground') ?? '#ffffff',
+    foreground: get('foreground') ?? '#000000',
+    mutedForeground: get('muted-foreground') ?? '#888888',
+    border: get('border') ?? 'rgba(128,128,128,0.3)',
+  };
+}
+
+function resolveThemeColors({ css, variants, isDark, isDefaultTheme }: {
+  css?: string;
+  variants?: ('light' | 'dark')[];
+  isDark: boolean;
+  isDefaultTheme: boolean;
+}): ThemeColors {
+  // Prefer the variant matching the app's current mode; fall back to the one
+  // the theme actually ships if it's single-variant.
+  const hasLight = !variants || variants.includes('light');
+  const hasDark = !variants || variants.includes('dark');
+  const wantDark = (isDark && hasDark) || !hasLight;
+
+  if (isDefaultTheme || !css) return wantDark ? DEFAULT_DARK : DEFAULT_LIGHT;
+  return (
+    extractThemeColors(css, wantDark) ??
+    extractThemeColors(css, !wantDark) ??
+    (wantDark ? DEFAULT_DARK : DEFAULT_LIGHT)
+  );
+}
+
+// A miniature of the real three-pane mailbox - icon nav rail, folder sidebar,
+// message list (first row selected) and reading pane - painted with the
+// theme's own colours, standing in for a screenshot.
+function ThemePreview({ colors }: { colors: ThemeColors }) {
+  const rail = `1px solid ${colors.border}`;
+  return (
+    <div className="w-full h-full flex overflow-hidden" style={{ backgroundColor: colors.background }}>
+      {/* Icon nav rail */}
+      <div
+        className="flex flex-col items-center gap-1 py-1.5 shrink-0"
+        style={{ width: '9%', backgroundColor: colors.sidebar, borderRight: rail }}
+      >
+        <div className="w-1.5 h-1.5 rounded-sm" style={{ backgroundColor: colors.primary }} />
+        {[0, 1, 2].map((i) => (
+          <div key={i} className="w-1.5 h-1.5 rounded-sm" style={{ backgroundColor: colors.mutedForeground, opacity: 0.4 }} />
+        ))}
+      </div>
+
+      {/* Folder sidebar */}
+      <div
+        className="flex flex-col gap-1 p-1.5 shrink-0"
+        style={{ width: '25%', backgroundColor: colors.sidebar, borderRight: rail }}
+      >
+        <div className="flex items-center gap-1 mb-0.5">
+          <div className="w-2 h-2 rounded-full shrink-0" style={{ backgroundColor: colors.mutedForeground, opacity: 0.5 }} />
+          <div className="h-1 rounded-full flex-1" style={{ backgroundColor: colors.foreground, opacity: 0.55 }} />
+        </div>
+        {[0.8, 0.65, 0.72, 0.5].map((w, i) => (
+          <div key={i} className="flex items-center gap-1">
+            <div className="w-1 h-1 rounded-sm shrink-0" style={{ backgroundColor: colors.mutedForeground, opacity: 0.45 }} />
+            <div className="h-1 rounded-full" style={{ width: `${w * 100}%`, backgroundColor: colors.mutedForeground, opacity: 0.4 }} />
+          </div>
+        ))}
+      </div>
+
+      {/* Message list */}
+      <div className="flex flex-col shrink-0" style={{ width: '36%', backgroundColor: colors.background, borderRight: rail }}>
+        {/* Selected row */}
+        <div className="flex items-start gap-1 p-1" style={{ backgroundColor: colors.primary }}>
+          <div className="w-2 h-2 rounded-full shrink-0" style={{ backgroundColor: colors.primaryForeground, opacity: 0.85 }} />
+          <div className="flex-1 flex flex-col gap-0.5">
+            <div className="h-1 rounded-full" style={{ width: '70%', backgroundColor: colors.primaryForeground, opacity: 0.9 }} />
+            <div className="h-1 rounded-full" style={{ width: '90%', backgroundColor: colors.primaryForeground, opacity: 0.55 }} />
+          </div>
+        </div>
+        {/* Unread + read rows */}
+        {[0.6, 0.7, 0.55].map((w, i) => (
+          <div key={i} className="flex items-start gap-1 p-1" style={{ borderTop: rail }}>
+            <div className="w-2 h-2 rounded-full shrink-0" style={{ backgroundColor: colors.mutedForeground, opacity: 0.4 }} />
+            <div className="flex-1 flex flex-col gap-0.5">
+              <div className="h-1 rounded-full" style={{ width: `${w * 100}%`, backgroundColor: colors.foreground, opacity: i === 0 ? 0.7 : 0.5 }} />
+              <div className="h-1 rounded-full" style={{ width: '85%', backgroundColor: colors.mutedForeground, opacity: 0.35 }} />
+            </div>
+          </div>
+        ))}
+      </div>
+
+      {/* Reading pane */}
+      <div className="flex-1 flex flex-col gap-1 p-1.5 min-w-0">
+        <div className="h-1.5 rounded-full" style={{ width: '70%', backgroundColor: colors.foreground, opacity: 0.85 }} />
+        <div className="h-1 rounded-full mb-1" style={{ width: '40%', backgroundColor: colors.mutedForeground, opacity: 0.5 }} />
+        {[0.95, 0.85, 0.9, 0.6].map((w, i) => (
+          <div key={i} className="h-1 rounded-full" style={{ width: `${w * 100}%`, backgroundColor: colors.mutedForeground, opacity: 0.3 }} />
+        ))}
+      </div>
+    </div>
+  );
+}

components/ui/avatar.tsx

@@ -6,6 +6,7 @@ import { useSettingsStore } from "@/stores/settings-store";
 import { useContactStore, getContactPhotoUri } from "@/stores/contact-store";
 import { useConfig } from "@/hooks/use-config";
 import { avatarHooks } from "@/lib/plugin-hooks";
+import { withBasePath } from "@/lib/browser-navigation";
 
 const IS_DEV = process.env.NODE_ENV !== "production";
 
@@ -236,7 +237,7 @@ export function Avatar({ name, email, contactPhotoUri, size = "md", className, d
   const customAvatar = devMode && email ? CUSTOM_AVATARS[email.toLowerCase()] : null;
   const pluginAvatar = pluginAvatarFailed ? null : pluginAvatarUrl;
   const photoSrc = resolvedContactPhoto || pluginAvatar || customAvatar || profilePic || null;
-  const faviconSrc = !imgError && !domainFailed && showFavicon ? `/api/favicon?domain=${encodeURIComponent(faviconDomain!)}` : null;
+  const faviconSrc = !imgError && !domainFailed && showFavicon ? withBasePath(`/api/favicon?domain=${encodeURIComponent(faviconDomain!)}`) : null;
   const imgSrc = disableImages ? null : (photoSrc || faviconSrc);
   const isFavicon = imgSrc !== null && imgSrc === faviconSrc;
 
@@ -269,6 +270,15 @@ export function Avatar({ name, email, contactPhotoUri, size = "md", className, d
           alt=""
           className="w-full h-full object-cover"
           onError={handleImgError}
+          // /api/favicon returns a 1x1 transparent PNG (HTTP 200) when no real
+          // favicon exists, to avoid spamming the DevTools console with 404s.
+          // Detect that sentinel by naturalWidth and fall back to initials.
+          onLoad={(e) => {
+            const img = e.currentTarget;
+            if (isFavicon && img.naturalWidth <= 1) {
+              handleImgError();
+            }
+          }}
         />
       ) : (
         getInitials()

components/ui/flag-icons.tsx

@@ -98,6 +98,17 @@ export function FlagDE(props: FlagProps) {
   );
 }
 
+/** Hungary – Red, White, Green horizontal */
+export function FlagHU(props: FlagProps) {
+  return (
+    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 6 3" width={W} height={H} className={flagClass} {...props}>
+      <rect width="6" height="1" fill="#CD2A3E" />
+      <rect y="1" width="6" height="1" fill="#fff" />
+      <rect y="2" width="6" height="1" fill="#436F4D" />
+    </svg>
+  );
+}
+
 /** Latvia – Maroon, White, Maroon horizontal */
 export function FlagLV(props: FlagProps) {
   return (
@@ -219,6 +230,7 @@ export const flagComponents: Record<string, (props: FlagProps) => ReactElement>
   en: FlagGB,
   es: FlagES,
   fr: FlagFR,
+  hu: FlagHU,
   it: FlagIT,
   ja: FlagJP,
   ko: FlagKR,

components/ui/language-switcher.tsx

@@ -15,6 +15,7 @@ const languages = [
   { value: 'es', label: 'Español' },
   { value: 'fr', label: 'Français' },
   { value: 'it', label: 'Italiano' },
+  { value: 'hu', label: 'Magyar' },
   { value: 'lv', label: 'Latviešu' },
   { value: 'nl', label: 'Nederlands' },
   { value: 'pl', label: 'Polski' },

hooks/use-attachment-drag.ts

@@ -92,9 +92,11 @@ export function useAttachmentDrag(
         return;
       }
 
-      // `DownloadURL` format: <mime>:<filename>:<url>. Chromium reads this on
+      // `DownloadURL` format: <mime>:<filename>:<url>. The filename must be
-      // drop and writes a real file at the destination.
+      // raw - URL-encoding it lands literally on disk (`%20` instead of a
-      e.dataTransfer.setData("DownloadURL", `${type}:${encodeURIComponent(name)}:${url}`);
+      // space). Callers are expected to sanitise reserved chars (`:` etc.)
+      // beforehand.
+      e.dataTransfer.setData("DownloadURL", `${type}:${name}:${url}`);
       e.dataTransfer.effectAllowed = "copyMove";
     },
     [source.name, source.type, prefetch],

hooks/use-email-drag.ts

@@ -1,10 +1,21 @@
-"use client";
+"use client";
 
-import { useCallback, DragEvent } from "react";
+import { useCallback, useEffect, useMemo, useRef, DragEvent } from "react";
 import { Email } from "@/lib/jmap/types";
+import { IJMAPClient } from "@/lib/jmap/client-interface";
 import { useEmailStore } from "@/stores/email-store";
+import { useAuthStore } from "@/stores/auth-store";
 import { useDragDropContext } from "@/contexts/drag-drop-context";
 import { useUIStore } from "@/stores/ui-store";
+import { isDragOutSupported } from "@/hooks/use-attachment-drag";
+import {
+  bundleExportFilename,
+  DEFAULT_BUNDLE_TEMPLATE,
+  DEFAULT_EMAIL_TEMPLATE,
+  emailExportFilename,
+  type EmailFilenameOptions,
+} from "@/lib/download-filename";
+import { useSettingsStore } from "@/stores/settings-store";
 
 interface UseEmailDragOptions {
   email: Email;
@@ -15,6 +26,7 @@ interface UseEmailDragOptions {
 interface UseEmailDragReturn {
   dragHandlers: {
     draggable: boolean;
+    onPointerEnter?: () => void;
     onDragStart: (e: DragEvent<HTMLDivElement>) => void;
     onDragEnd: (e: DragEvent<HTMLDivElement>) => void;
   };
@@ -44,10 +56,153 @@ function createDragPreview(count: number): HTMLElement {
   return preview;
 }
 
+function bundleFilename(count: number, options: EmailFilenameOptions): string {
+  return bundleExportFilename(count, options);
+}
+
+// Shared bundle cache. The .zip is keyed by the sorted list of email IDs in
+// the selection, so two rows in the same selection reuse the same in-flight
+// build. When the selection changes, the previous bundle URL is scheduled for
+// revoke and a new build starts.
+type BundleEntry = {
+  key: string;
+  name: string;
+  url: string | null;
+  promise: Promise<string | null> | null;
+};
+
+let currentBundle: BundleEntry | null = null;
+
+function selectionKey(ids: string[]): string {
+  return [...ids].sort().join(",");
+}
+
+async function buildEmailZip(client: IJMAPClient, emails: Email[], options: EmailFilenameOptions): Promise<string | null> {
+  const eligible = emails.filter((em) => !!em.blobId);
+  if (eligible.length === 0) return null;
+  const { default: JSZip } = await import("jszip");
+  const zip = new JSZip();
+  const used = new Set<string>();
+  await Promise.all(
+    eligible.map(async (em) => {
+      const base = emailExportFilename(em, options).replace(/\.eml$/, "");
+      let name = `${base}.eml`;
+      while (used.has(name)) name = `${base} [${em.id.slice(0, 6)}].eml`;
+      used.add(name);
+      try {
+        const blob = await client.fetchBlob(em.blobId!, name, "message/rfc822");
+        zip.file(name, blob);
+      } catch {
+        // Skip individual failures; remaining messages still bundle.
+      }
+    }),
+  );
+  const zipBlob = await zip.generateAsync({ type: "blob", mimeType: "application/zip" });
+  return URL.createObjectURL(zipBlob);
+}
+
+function prefetchEmailBundle(
+  client: IJMAPClient,
+  emails: Email[],
+  emailOptions: EmailFilenameOptions,
+  bundleOptions: EmailFilenameOptions,
+): void {
+  const key = selectionKey(emails.map((e) => e.id));
+  if (currentBundle && currentBundle.key === key) return;
+  if (currentBundle?.url) {
+    const old = currentBundle.url;
+    setTimeout(() => URL.revokeObjectURL(old), 60_000);
+  }
+  const entry: BundleEntry = {
+    key,
+    name: bundleFilename(emails.length, bundleOptions),
+    url: null,
+    promise: null,
+  };
+  entry.promise = buildEmailZip(client, emails, emailOptions)
+    .then((url) => {
+      if (url && currentBundle === entry) entry.url = url;
+      return url;
+    })
+    .catch(() => null);
+  currentBundle = entry;
+}
+
+function getReadyBundle(emails: Email[]): { url: string; name: string } | null {
+  const key = selectionKey(emails.map((e) => e.id));
+  if (currentBundle && currentBundle.key === key && currentBundle.url) {
+    return { url: currentBundle.url, name: currentBundle.name };
+  }
+  return null;
+}
+
 export function useEmailDrag({ email, sourceMailboxId, threadEmails }: UseEmailDragOptions): UseEmailDragReturn {
   const { selectedEmailIds, emails } = useEmailStore();
   const { startDrag, endDrag, isDragging, draggedEmails } = useDragDropContext();
   const isMobile = useUIStore((state) => state.isMobile);
+  const client = useAuthStore((state) => state.client);
+  const template = useSettingsStore((s) => s.emailDownloadTemplate) || DEFAULT_EMAIL_TEMPLATE;
+  const bundleTemplate = useSettingsStore((s) => s.bundleDownloadTemplate) || DEFAULT_BUNDLE_TEMPLATE;
+  const spaceReplacement = useSettingsStore((s) => s.filenameSpaceReplacement);
+  const lowercase = useSettingsStore((s) => s.filenameLowercase);
+  const stripDiacritics = useSettingsStore((s) => s.filenameStripDiacritics);
+  const collapseSeparators = useSettingsStore((s) => s.filenameCollapseSeparators);
+  const filenameOptions: EmailFilenameOptions = useMemo(
+    () => ({ template, spaceReplacement, lowercase, stripDiacritics, collapseSeparators }),
+    [template, spaceReplacement, lowercase, stripDiacritics, collapseSeparators],
+  );
+  const bundleOptions: EmailFilenameOptions = useMemo(
+    () => ({ template: bundleTemplate, spaceReplacement, lowercase, stripDiacritics, collapseSeparators }),
+    [bundleTemplate, spaceReplacement, lowercase, stripDiacritics, collapseSeparators],
+  );
+
+  const dragOutEnabled = !isMobile && isDragOutSupported() && !!client;
+  const singleBlobUrlRef = useRef<string | null>(null);
+  const inFlightRef = useRef<Promise<string | null> | null>(null);
+
+  useEffect(() => {
+    return () => {
+      if (singleBlobUrlRef.current) {
+        const url = singleBlobUrlRef.current;
+        singleBlobUrlRef.current = null;
+        // Defer revoke - Chromium asynchronously reads the blob: URL after the
+        // drop completes, so revoking immediately can race the OS.
+        setTimeout(() => URL.revokeObjectURL(url), 60_000);
+      }
+      inFlightRef.current = null;
+    };
+  }, [email.id]);
+
+  const prefetchSingle = useCallback(() => {
+    if (!dragOutEnabled || !client || !email.blobId) return;
+    if (singleBlobUrlRef.current || inFlightRef.current) return;
+    const name = emailExportFilename(email, filenameOptions);
+    inFlightRef.current = client
+      .fetchBlobAsObjectUrl(email.blobId, name, "message/rfc822")
+      .then((url) => {
+        if (url && !singleBlobUrlRef.current) singleBlobUrlRef.current = url;
+        return url;
+      })
+      .catch(() => null)
+      .finally(() => {
+        inFlightRef.current = null;
+      });
+  }, [dragOutEnabled, client, email, filenameOptions]);
+
+  const handlePointerEnter = useCallback(() => {
+    if (!dragOutEnabled || !client) return;
+    const isSelected = selectedEmailIds.has(email.id);
+    const isMulti = isSelected && selectedEmailIds.size > 1;
+    if (isMulti) {
+      const selected = emails.filter((em) => selectedEmailIds.has(em.id));
+      // Only worth bundling when at least one selected email has a blobId.
+      if (selected.some((em) => em.blobId)) {
+        prefetchEmailBundle(client, selected, filenameOptions, bundleOptions);
+      }
+    } else {
+      prefetchSingle();
+    }
+  }, [dragOutEnabled, client, selectedEmailIds, email.id, emails, prefetchSingle, filenameOptions, bundleOptions]);
 
   const handleDragStart = useCallback((e: DragEvent<HTMLDivElement>) => {
     // Determine which emails to drag:
@@ -59,8 +214,7 @@ export function useEmailDrag({ email, sourceMailboxId, threadEmails }: UseEmailD
       ? emails.filter(em => selectedEmailIds.has(em.id))
       : threadEmails || [email];
 
-    // Set data transfer
+    e.dataTransfer.effectAllowed = "copyMove";
-    e.dataTransfer.effectAllowed = "move";
     e.dataTransfer.setData(
       "application/x-email-ids",
       JSON.stringify(emailsToDrag.map(em => em.id))
@@ -70,6 +224,40 @@ export function useEmailDrag({ email, sourceMailboxId, threadEmails }: UseEmailD
       emailsToDrag.map(em => em.subject || "(no subject)").join(", ")
     );
 
+    // Drag-out to file explorer.
+    if (dragOutEnabled && client) {
+      if (emailsToDrag.length === 1 && emailsToDrag[0].blobId) {
+        const url = singleBlobUrlRef.current;
+        if (url) {
+          const name = emailExportFilename(emailsToDrag[0], filenameOptions);
+          // `DownloadURL` format: <mime>:<filename>:<url>. Chromium expects
+          // the filename raw - URL-encoding it ends up literally on disk
+          // (e.g. `%20` instead of a space). The sanitiser already removed
+          // `:` and other reserved chars, so embedding the name as-is is
+          // safe. Firefox/Safari ignore this entry entirely.
+          e.dataTransfer.setData(
+            "DownloadURL",
+            `message/rfc822:${name}:${url}`,
+          );
+        } else {
+          // Not warmed up yet — kick off so the next attempt works. Don't
+          // preventDefault: in-app drop still has to function.
+          prefetchSingle();
+        }
+      } else if (emailsToDrag.length > 1) {
+        const ready = getReadyBundle(emailsToDrag);
+        if (ready) {
+          e.dataTransfer.setData(
+            "DownloadURL",
+            `application/zip:${ready.name}:${ready.url}`,
+          );
+        } else {
+          // Kick off the bundle build for the next attempt.
+          prefetchEmailBundle(client, emailsToDrag, filenameOptions, bundleOptions);
+        }
+      }
+    }
+
     // Create custom drag image
     const dragPreview = createDragPreview(emailsToDrag.length);
     e.dataTransfer.setDragImage(dragPreview, 0, 0);
@@ -80,10 +268,18 @@ export function useEmailDrag({ email, sourceMailboxId, threadEmails }: UseEmailD
     });
 
     startDrag(emailsToDrag, sourceMailboxId);
-  }, [email, selectedEmailIds, emails, sourceMailboxId, startDrag, threadEmails]);
+  }, [email, selectedEmailIds, emails, sourceMailboxId, startDrag, threadEmails, dragOutEnabled, client, prefetchSingle, filenameOptions, bundleOptions]);
 
   const handleDragEnd = useCallback(() => {
     endDrag();
+    // Defer-revoke the per-row single .eml URL. The shared bundle URL stays
+    // cached until the selection changes - revoking it here would break a
+    // subsequent drag of the same selection.
+    if (singleBlobUrlRef.current) {
+      const url = singleBlobUrlRef.current;
+      singleBlobUrlRef.current = null;
+      setTimeout(() => URL.revokeObjectURL(url), 60_000);
+    }
   }, [endDrag]);
 
   // Check if this specific email is being dragged
@@ -94,6 +290,7 @@ export function useEmailDrag({ email, sourceMailboxId, threadEmails }: UseEmailD
       ? { draggable: false, onDragStart: () => {}, onDragEnd: () => {} }
       : {
           draggable: true,
+          onPointerEnter: dragOutEnabled ? handlePointerEnter : undefined,
           onDragStart: handleDragStart,
           onDragEnd: handleDragEnd,
         },

hooks/use-keyboard-shortcuts.ts

@@ -289,6 +289,9 @@ export const KEYBOARD_SHORTCUTS = {
     { key: "x", description: "shortcuts.threads.expand_collapse" },
   ],
   composer: [
+    { key: "Ctrl + Enter", description: "shortcuts.composer.send" },
+    { key: "Ctrl + Shift + Enter", description: "shortcuts.composer.schedule_send" },
     { key: "t", description: "shortcuts.composer.template_picker" },
+    { key: "Ctrl/Cmd + Enter", description: "shortcuts.composer.send" },
   ],
 } as const;

hooks/use-mailbox-drop.ts

@@ -81,20 +81,8 @@ export function useMailboxDrop({ mailbox, onDropComplete, onSuccess, onError }:
     // Virtual nodes (shared folder headers) cannot be drop targets
     if (mailbox.id.startsWith("shared-")) return false;
 
-    // Shared (delegated) mailboxes still require the source to belong to the
-    // same delegating account. Real cross-account moves between primary
-    // accounts go through the cross-account path further down, but the
-    // shared-folder semantics here are about ACLs rather than transport, so
-    // they remain disallowed.
-    if (mailbox.isShared && draggedEmails[0]) {
-      const sourceMb = useEmailStore.getState().mailboxes.find(mb => mb.id === sourceMailboxId);
-      if (sourceMb?.accountId !== mailbox.accountId) {
-        return false;
-      }
-    }
-
     return true;
-  }, [isDragging, mailbox, sourceMailboxId, draggedEmails]);
+  }, [isDragging, mailbox, sourceMailboxId]);
 
   const handleDragOver = useCallback((e: DragEvent<HTMLDivElement>) => {
     e.preventDefault();
@@ -154,18 +142,42 @@ export function useMailboxDrop({ mailbox, onDropComplete, onSuccess, onError }:
         bySource.get(srcAccountId)!.push(id);
       }
 
+      // Decide whether to route via the cross-account (blob copy + import)
+      // pipeline. Two cases require it:
+      //   1. Destination is a delegated/shared mailbox whose owner JMAP
+      //      account differs from the source mailbox's JMAP account. There's
+      //      no atomic Email/set across accounts, even via the same client.
+      //   2. Destination is a primary mailbox on a different connected local
+      //      account than the source — the historical multi-account case.
+      const sourceMb = useEmailStore.getState().mailboxes.find(mb => mb.id === sourceMailboxId);
+      const sourceJmapAccountId = sourceMb?.accountId;
+      const destJmapAccountId = mailbox.accountId;
       const sourceAccountIds = Array.from(bySource.keys());
-      const isCrossAccount =
+
-        !!destAccountId &&
+      const isJmapCrossAccount =
+        !!sourceJmapAccountId &&
+        !!destJmapAccountId &&
+        sourceJmapAccountId !== destJmapAccountId;
+      const isLocalCrossAccount =
         !mailbox.isShared &&
+        !!destAccountId &&
         sourceAccountIds.some((src) => src !== destAccountId);
+      const isCrossAccount = isJmapCrossAccount || isLocalCrossAccount;
 
       if (isCrossAccount) {
-        // JMAP can't natively move an email between primary accounts, so the
+        if (!destAccountId) {
-        // store reuploads each source blob into the destination account and
+          throw new Error('Could not resolve destination account');
-        // then deletes the original.
+        }
+        // For a shared destination there is no separately-connected client
+        // for the owner; we reuse the viewing user's client but tell the
+        // import call to target the owner's JMAP account.
         const jmapDestId = mailbox.originalId || mailbox.id;
-        await crossAccountMoveEmails(bySource, destAccountId, jmapDestId);
+        const destJmapOverride = mailbox.isShared ? mailbox.accountId : undefined;
+        // Mirror image for the source: a shared group mailbox is accessed
+        // through the viewing user's client, but the email/blob live in the
+        // owner's JMAP account, so the copy/delete must target it.
+        const sourceJmapOverride = sourceMb?.isShared ? sourceMb.accountId : undefined;
+        await crossAccountMoveEmails(bySource, destAccountId, jmapDestId, destJmapOverride, sourceJmapOverride);
       } else {
         // Single-account or same-account-shared move: bulk JMAP request.
         await moveEmailsToMailbox(client, emailIds, mailbox.id);

i18n/routing.ts

@@ -12,9 +12,21 @@ const localePrefix = (process.env.NEXT_PUBLIC_LOCALE_PREFIX ?? 'never') as
   | 'always'
   | 'as-needed';
 
+const SUPPORTED_LOCALES = ['cs', 'da', 'de', 'en', 'es', 'fr', 'hu', 'it', 'ja', 'ko', 'lv', 'nl', 'pl', 'pt', 'ru', 'tr', 'uk', 'zh'] as const;
+
+// Fallback locale used when the visitor's Accept-Language header does not
+// match any supported locale (and no NEXT_LOCALE cookie is set yet). Admins
+// set this via NEXT_PUBLIC_DEFAULT_LOCALE at build time to localise greenfield
+// deployments without having every user change their preference manually.
+const envDefaultLocale = process.env.NEXT_PUBLIC_DEFAULT_LOCALE?.trim();
+const resolvedDefaultLocale =
+  envDefaultLocale && (SUPPORTED_LOCALES as readonly string[]).includes(envDefaultLocale)
+    ? (envDefaultLocale as (typeof SUPPORTED_LOCALES)[number])
+    : 'en';
+
 export const routing = defineRouting({
-  locales: ['cs', 'da', 'de', 'en', 'es', 'fr', 'it', 'ja', 'ko', 'lv', 'nl', 'pl', 'pt', 'ru', 'tr', 'uk', 'zh'],
+  locales: SUPPORTED_LOCALES,
-  defaultLocale: 'en',
+  defaultLocale: resolvedDefaultLocale,
   localePrefix
 });
 

lib/__tests__/base-path.test.ts

@@ -0,0 +1,74 @@
+import { describe, it, expect, vi, afterEach } from 'vitest';
+
+// `browser-navigation` reads NEXT_PUBLIC_BASE_PATH into a module-load constant
+// (mirroring how next.config.ts bakes basePath in at build time), so each case
+// has to re-import the module under a fresh env. These tests pin down the
+// promise made to subpath deployments: the built-in branding *defaults*
+// (FAVICON_URL, LOGIN_LOGO_*) — not just admin-set custom values — get the
+// mount prefix, because every consumer wraps them in withBasePath(). See #330.
+async function loadNav(basePath?: string) {
+  vi.resetModules();
+  if (basePath === undefined) {
+    delete process.env.NEXT_PUBLIC_BASE_PATH;
+  } else {
+    process.env.NEXT_PUBLIC_BASE_PATH = basePath;
+  }
+  return import('@/lib/browser-navigation');
+}
+
+// The fallback values from CONFIG_ENV_MAP that ship in the box.
+const DEFAULT_FAVICON = '/branding/Bulwark_Favicon.svg';
+const DEFAULT_LOGIN_LOGO_LIGHT = '/branding/Bulwark_Logo_Color.svg';
+const DEFAULT_LOGIN_LOGO_DARK = '/branding/Bulwark_Logo_White.svg';
+
+afterEach(() => {
+  delete process.env.NEXT_PUBLIC_BASE_PATH;
+  vi.resetModules();
+});
+
+describe('withBasePath — asset-URL fallbacks under a subpath', () => {
+  it('leaves branding defaults untouched when no base path is set', async () => {
+    const { withBasePath } = await loadNav(undefined);
+    // jsdom's window.location.pathname is "/", so runtime detection finds no
+    // prefix either — the default paths pass through unchanged.
+    expect(withBasePath(DEFAULT_FAVICON)).toBe(DEFAULT_FAVICON);
+    expect(withBasePath(DEFAULT_LOGIN_LOGO_LIGHT)).toBe(DEFAULT_LOGIN_LOGO_LIGHT);
+    expect(withBasePath(DEFAULT_LOGIN_LOGO_DARK)).toBe(DEFAULT_LOGIN_LOGO_DARK);
+  });
+
+  it('prefixes the built-in favicon and login-logo defaults', async () => {
+    const { withBasePath } = await loadNav('/webmail');
+    expect(withBasePath(DEFAULT_FAVICON)).toBe('/webmail/branding/Bulwark_Favicon.svg');
+    expect(withBasePath(DEFAULT_LOGIN_LOGO_LIGHT)).toBe('/webmail/branding/Bulwark_Logo_Color.svg');
+    expect(withBasePath(DEFAULT_LOGIN_LOGO_DARK)).toBe('/webmail/branding/Bulwark_Logo_White.svg');
+  });
+
+  it('is idempotent for an already-prefixed value (no double prefix)', async () => {
+    const { withBasePath } = await loadNav('/webmail');
+    expect(withBasePath('/webmail/branding/Bulwark_Favicon.svg')).toBe('/webmail/branding/Bulwark_Favicon.svg');
+    expect(withBasePath('/webmail')).toBe('/webmail');
+  });
+
+  it('passes through external, protocol-relative, data, and empty values', async () => {
+    const { withBasePath } = await loadNav('/webmail');
+    expect(withBasePath('https://cdn.example.com/logo.svg')).toBe('https://cdn.example.com/logo.svg');
+    expect(withBasePath('//cdn.example.com/logo.svg')).toBe('//cdn.example.com/logo.svg');
+    expect(withBasePath('data:image/svg+xml,<svg/>')).toBe('data:image/svg+xml,<svg/>');
+    expect(withBasePath('')).toBe('');
+    expect(withBasePath(null)).toBe('');
+    expect(withBasePath(undefined)).toBe('');
+  });
+
+  it('strips a trailing slash on the configured base path', async () => {
+    const { withBasePath, getPathPrefix } = await loadNav('/webmail/');
+    expect(getPathPrefix()).toBe('/webmail');
+    expect(withBasePath(DEFAULT_FAVICON)).toBe('/webmail/branding/Bulwark_Favicon.svg');
+  });
+
+  it('getPathPrefix reports the static base path on the server (no window needed)', async () => {
+    const { getPathPrefix } = await loadNav('/webmail');
+    // SSR consumers (layout.tsx favicon metadata, manifest.ts) rely on this
+    // resolving from the build-time constant rather than window.location.
+    expect(getPathPrefix()).toBe('/webmail');
+  });
+});

lib/__tests__/builtin-themes.test.ts

@@ -2,8 +2,8 @@ import { describe, it, expect } from 'vitest';
 import { BUILTIN_THEMES } from '../builtin-themes';
 
 describe('BUILTIN_THEMES', () => {
-  it('contains exactly 3 themes', () => {
+  it('contains exactly 6 themes', () => {
-    expect(BUILTIN_THEMES).toHaveLength(3);
+    expect(BUILTIN_THEMES).toHaveLength(6);
   });
 
   it('all themes have required fields', () => {
@@ -43,6 +43,8 @@ describe('BUILTIN_THEMES', () => {
     expect(names).toContain('Nord');
     expect(names).toContain('Catppuccin');
     expect(names).toContain('Solarized');
+    expect(names).toContain('Roundcube Elastic');
+    expect(names).toContain('Aurora Glass');
   });
 
   it('theme IDs are unique', () => {

lib/__tests__/config-route.test.ts

@@ -36,16 +36,29 @@ describe('config API route', () => {
     delete process.env.LOGIN_IMPRINT_URL;
     delete process.env.LOGIN_PRIVACY_POLICY_URL;
     delete process.env.LOGIN_WEBSITE_URL;
+    delete process.env.DOMAIN_BRANDING;
   });
 
   afterEach(() => {
     process.env = { ...originalEnv };
   });
 
-  async function getConfig() {
+  function mockRequest(headers: Record<string, string> = {}): unknown {
+    const lc: Record<string, string> = {};
+    for (const [k, v] of Object.entries(headers)) lc[k.toLowerCase()] = v;
+    return {
+      headers: {
+        get(name: string) {
+          return lc[name.toLowerCase()] ?? null;
+        },
+      },
+    };
+  }
+
+  async function getConfig(headers?: Record<string, string>) {
     // Re-import to pick up env changes
     const { GET } = await import('@/app/api/config/route');
-    const response = await GET();
+    const response = await GET(mockRequest(headers) as Parameters<typeof GET>[0]);
     return response.json();
   }
 
@@ -192,4 +205,70 @@ describe('config API route', () => {
     expect(config.appLogoLightUrl).toBe('/branding/my-logo.svg');
     expect(config.appLogoDarkUrl).toBe('/branding/my-logo-white.svg');
   });
+
+  describe('per-domain branding overrides', () => {
+    it('applies overrides for the matching host', async () => {
+      process.env.LOGIN_COMPANY_NAME = 'Default Co';
+      process.env.LOGIN_WEBSITE_URL = 'https://default.example';
+      process.env.DOMAIN_BRANDING = JSON.stringify([
+        {
+          host: 'mail1.example.com',
+          loginCompanyName: 'Brand One',
+          loginWebsiteUrl: 'https://one.example',
+        },
+      ]);
+
+      const config = await getConfig({ host: 'mail1.example.com' });
+
+      expect(config.loginCompanyName).toBe('Brand One');
+      expect(config.loginWebsiteUrl).toBe('https://one.example');
+    });
+
+    it('falls through to the global value when the host has no entry', async () => {
+      process.env.LOGIN_COMPANY_NAME = 'Default Co';
+      process.env.DOMAIN_BRANDING = JSON.stringify([
+        { host: 'mail1.example.com', loginCompanyName: 'Brand One' },
+      ]);
+
+      const config = await getConfig({ host: 'unmapped.example.com' });
+
+      expect(config.loginCompanyName).toBe('Default Co');
+    });
+
+    it('falls through field-by-field when the matching entry omits a field', async () => {
+      process.env.LOGIN_COMPANY_NAME = 'Default Co';
+      process.env.LOGIN_WEBSITE_URL = 'https://default.example';
+      process.env.DOMAIN_BRANDING = JSON.stringify([
+        { host: 'mail1.example.com', loginCompanyName: 'Brand One' },
+      ]);
+
+      const config = await getConfig({ host: 'mail1.example.com' });
+
+      expect(config.loginCompanyName).toBe('Brand One');
+      expect(config.loginWebsiteUrl).toBe('https://default.example');
+    });
+
+    it('prefers X-Forwarded-Host over Host', async () => {
+      process.env.DOMAIN_BRANDING = JSON.stringify([
+        { host: 'public.example.com', loginCompanyName: 'Public' },
+      ]);
+
+      const config = await getConfig({
+        host: 'internal.example.com',
+        'x-forwarded-host': 'public.example.com',
+      });
+
+      expect(config.loginCompanyName).toBe('Public');
+    });
+
+    it('strips the port from the host header before matching', async () => {
+      process.env.DOMAIN_BRANDING = JSON.stringify([
+        { host: 'mail1.example.com', loginCompanyName: 'Brand One' },
+      ]);
+
+      const config = await getConfig({ host: 'mail1.example.com:8443' });
+
+      expect(config.loginCompanyName).toBe('Brand One');
+    });
+  });
 });

lib/__tests__/domain-branding.test.ts

@@ -0,0 +1,151 @@
+import { describe, it, expect } from 'vitest';
+import {
+  matchDomainBranding,
+  parseDomainBranding,
+  pickRequestHost,
+  type DomainBrandingEntry,
+} from '@/lib/admin/domain-branding';
+
+function mockHeaders(map: Record<string, string>): Headers {
+  const lc: Record<string, string> = {};
+  for (const [k, v] of Object.entries(map)) lc[k.toLowerCase()] = v;
+  return {
+    get(name: string) {
+      return lc[name.toLowerCase()] ?? null;
+    },
+  } as unknown as Headers;
+}
+
+describe('parseDomainBranding', () => {
+  it('returns [] for null/undefined/empty', () => {
+    expect(parseDomainBranding(null)).toEqual([]);
+    expect(parseDomainBranding(undefined)).toEqual([]);
+    expect(parseDomainBranding('')).toEqual([]);
+    expect(parseDomainBranding([])).toEqual([]);
+  });
+
+  it('parses a stringified JSON array', () => {
+    const raw = JSON.stringify([{ host: 'mail.example.com', loginCompanyName: 'Acme' }]);
+    expect(parseDomainBranding(raw)).toEqual([
+      { host: 'mail.example.com', loginCompanyName: 'Acme' },
+    ]);
+  });
+
+  it('lower-cases hosts and strips trailing dots', () => {
+    expect(parseDomainBranding([{ host: 'Mail.Example.COM.' }])).toEqual([
+      { host: 'mail.example.com' },
+    ]);
+  });
+
+  it('accepts wildcard hosts', () => {
+    expect(parseDomainBranding([{ host: '*.example.com', loginCompanyName: 'Wild' }])).toEqual([
+      { host: '*.example.com', loginCompanyName: 'Wild' },
+    ]);
+  });
+
+  it('drops entries with invalid hosts', () => {
+    const out = parseDomainBranding([
+      { host: '' },
+      { host: 'has space.com' },
+      { host: 'foo..bar' },
+      { host: '*.*.example.com' }, // embedded wildcard not allowed
+      { host: 'good.example.com' },
+    ]);
+    expect(out.map(e => e.host)).toEqual(['good.example.com']);
+  });
+
+  it('drops duplicate hosts, keeping the first', () => {
+    const out = parseDomainBranding([
+      { host: 'foo.com', loginCompanyName: 'First' },
+      { host: 'FOO.com', loginCompanyName: 'Second' },
+    ]);
+    expect(out).toEqual([{ host: 'foo.com', loginCompanyName: 'First' }]);
+  });
+
+  it('ignores non-string and empty-string override fields', () => {
+    const out = parseDomainBranding([
+      {
+        host: 'foo.com',
+        loginCompanyName: '',
+        loginImprintUrl: 42,
+        loginWebsiteUrl: 'https://foo.com',
+      },
+    ]);
+    expect(out).toEqual([{ host: 'foo.com', loginWebsiteUrl: 'https://foo.com' }]);
+  });
+
+  it('ignores unknown fields', () => {
+    const out = parseDomainBranding([
+      { host: 'foo.com', notARealField: 'x', loginCompanyName: 'OK' },
+    ]);
+    expect(out).toEqual([{ host: 'foo.com', loginCompanyName: 'OK' }]);
+  });
+});
+
+describe('pickRequestHost', () => {
+  it('returns null when no host headers are set', () => {
+    expect(pickRequestHost(mockHeaders({}))).toBeNull();
+  });
+
+  it('prefers X-Forwarded-Host over Host', () => {
+    expect(pickRequestHost(mockHeaders({
+      'x-forwarded-host': 'forwarded.example.com',
+      host: 'origin.example.com',
+    }))).toBe('forwarded.example.com');
+  });
+
+  it('falls back to Host when X-Forwarded-Host is absent', () => {
+    expect(pickRequestHost(mockHeaders({ host: 'origin.example.com' }))).toBe('origin.example.com');
+  });
+
+  it('strips the port', () => {
+    expect(pickRequestHost(mockHeaders({ host: 'example.com:8080' }))).toBe('example.com');
+  });
+
+  it('takes the first entry of a comma-separated X-Forwarded-Host', () => {
+    expect(pickRequestHost(mockHeaders({
+      'x-forwarded-host': 'first.example.com, second.example.com',
+    }))).toBe('first.example.com');
+  });
+
+  it('lower-cases the result', () => {
+    expect(pickRequestHost(mockHeaders({ host: 'EXAMPLE.com' }))).toBe('example.com');
+  });
+});
+
+describe('matchDomainBranding', () => {
+  const entries: DomainBrandingEntry[] = [
+    { host: 'mail.example.com', loginCompanyName: 'Exact' },
+    { host: '*.example.com', loginCompanyName: 'Wildcard' },
+    { host: '*.dev.example.com', loginCompanyName: 'Specific Wildcard' },
+    { host: 'other.com', loginCompanyName: 'Other' },
+  ];
+
+  it('returns {} when host is null', () => {
+    expect(matchDomainBranding(null, entries)).toEqual({});
+  });
+
+  it('returns {} when no entries match', () => {
+    expect(matchDomainBranding('unknown.org', entries)).toEqual({});
+  });
+
+  it('prefers exact match over wildcard', () => {
+    expect(matchDomainBranding('mail.example.com', entries).loginCompanyName).toBe('Exact');
+  });
+
+  it('matches wildcards on subdomains', () => {
+    expect(matchDomainBranding('foo.example.com', entries).loginCompanyName).toBe('Wildcard');
+  });
+
+  it('prefers the longest wildcard suffix', () => {
+    expect(matchDomainBranding('app.dev.example.com', entries).loginCompanyName).toBe('Specific Wildcard');
+  });
+
+  it('does not match the wildcard host against the apex domain', () => {
+    expect(matchDomainBranding('example.com', entries)).toEqual({});
+  });
+
+  it('is case-insensitive on the request host', () => {
+    expect(matchDomainBranding('Mail.Example.COM', entries).loginCompanyName).toBe('Exact');
+  });
+});

lib/__tests__/email-headers.test.ts

@@ -7,6 +7,7 @@ import {
   getSecurityStatus,
   parseSpamLLM,
   extractListHeaders,
+  isAuthenticationSpoofed,
 } from '../email-headers';
 
 describe('parseAuthenticationResults', () => {
@@ -52,6 +53,66 @@ describe('parseAuthenticationResults', () => {
     const result = parseAuthenticationResults('spf=softfail smtp.mailfrom=example.com');
     expect(result.spf?.result).toBe('softfail');
   });
+
+  it('surfaces the most severe result when multiple SPF identities exist', () => {
+    // HELO temperror, MAIL FROM fail — the harder fail must be the headline.
+    const header =
+      'mx.example.com; spf=temperror (mx: dns timeout) smtp.helo=mail.spoof.com; spf=fail (mx: not authorized) smtp.mailfrom=victim.com';
+    const result = parseAuthenticationResults(header);
+    expect(result.spf?.result).toBe('fail');
+    expect(result.spf?.domain).toBe('victim.com');
+  });
+
+  it('exposes all SPF results when more than one identity is evaluated', () => {
+    const header =
+      'spf=temperror smtp.helo=mail.spoof.com; spf=fail smtp.mailfrom=victim.com';
+    const result = parseAuthenticationResults(header);
+    expect(result.spf?.all).toEqual([
+      { result: 'temperror', identity: 'helo', domain: 'mail.spoof.com' },
+      { result: 'fail', identity: 'mailfrom', domain: 'victim.com' },
+    ]);
+  });
+
+  it('does not set `all` for a single SPF result', () => {
+    const result = parseAuthenticationResults('spf=pass smtp.mailfrom=example.com');
+    expect(result.spf?.all).toBeUndefined();
+  });
+
+  it('prefers the MAIL FROM identity when severities tie', () => {
+    const header = 'spf=pass smtp.helo=mail.example.com; spf=pass smtp.mailfrom=example.com';
+    const result = parseAuthenticationResults(header);
+    expect(result.spf?.domain).toBe('example.com');
+  });
+});
+
+describe('isAuthenticationSpoofed', () => {
+  it('returns false when no auth results are present', () => {
+    expect(isAuthenticationSpoofed(undefined)).toBe(false);
+    expect(isAuthenticationSpoofed({})).toBe(false);
+  });
+
+  it('flags a DMARC fail as spoofed', () => {
+    expect(isAuthenticationSpoofed({ dmarc: { result: 'fail' } })).toBe(true);
+  });
+
+  it('flags a hard SPF fail without a passing DKIM as spoofed', () => {
+    expect(isAuthenticationSpoofed({ spf: { result: 'fail' } })).toBe(true);
+    expect(
+      isAuthenticationSpoofed({ spf: { result: 'fail' }, dkim: { result: 'fail' } })
+    ).toBe(true);
+  });
+
+  it('does not flag an SPF fail rescued by a passing DKIM', () => {
+    expect(
+      isAuthenticationSpoofed({ spf: { result: 'fail' }, dkim: { result: 'pass' } })
+    ).toBe(false);
+  });
+
+  it('does not flag passing or ambiguous results', () => {
+    expect(isAuthenticationSpoofed({ spf: { result: 'pass' }, dmarc: { result: 'pass' } })).toBe(false);
+    expect(isAuthenticationSpoofed({ spf: { result: 'softfail' } })).toBe(false);
+    expect(isAuthenticationSpoofed({ spf: { result: 'temperror' } })).toBe(false);
+  });
 });
 
 describe('parseSpamScore', () => {

lib/__tests__/host-theme.test.ts

@@ -0,0 +1,43 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { snapshotHostTheme, themeSnapshotToCSS, type ThemeSnapshot } from '../plugin-sandbox/host-theme';
+
+describe('host-theme', () => {
+  describe('themeSnapshotToCSS', () => {
+    it('emits the token values, font, and color-scheme', () => {
+      const snapshot: ThemeSnapshot = {
+        dark: false,
+        fontFamily: 'Inter, sans-serif',
+        vars: { '--color-background': '#ffffff', '--color-foreground': '#0f172a' },
+      };
+      const css = themeSnapshotToCSS(snapshot);
+      expect(css).toContain('--color-background: #ffffff;');
+      expect(css).toContain('--color-foreground: #0f172a;');
+      expect(css).toContain('font-family: Inter, sans-serif;');
+      expect(css).toContain('color-scheme: light;');
+      // Body inherits the theme foreground so unstyled plugin text adapts.
+      expect(css).toContain('color: var(--color-foreground, inherit);');
+      expect(css).toContain('background: transparent;');
+    });
+
+    it('reports a dark color-scheme when dark', () => {
+      const css = themeSnapshotToCSS({ dark: true, fontFamily: 'sans-serif', vars: {} });
+      expect(css).toContain('color-scheme: dark;');
+    });
+  });
+
+  describe('snapshotHostTheme', () => {
+    afterEach(() => {
+      document.documentElement.classList.remove('dark');
+      document.documentElement.removeAttribute('style');
+    });
+
+    it('reads the dark flag and declared tokens off <html>', () => {
+      document.documentElement.classList.add('dark');
+      document.documentElement.style.setProperty('--color-background', '#0a0a0a');
+      const snapshot = snapshotHostTheme();
+      expect(snapshot.dark).toBe(true);
+      expect(snapshot.vars['--color-background']).toBe('#0a0a0a');
+      expect(snapshot.fontFamily).toBeTruthy();
+    });
+  });
+});

lib/__tests__/jmap-send-threading.test.ts

@@ -11,6 +11,34 @@ function createClient(): JMAPClient {
   return client;
 }
 
+function enableDelayedSend(client: JMAPClient) {
+  Object.assign(client, {
+    capabilities: {
+      'urn:ietf:params:jmap:core': {},
+      'urn:ietf:params:jmap:mail': {},
+      'urn:ietf:params:jmap:submission': {},
+    },
+    session: {
+      primaryAccounts: {
+        'urn:ietf:params:jmap:mail': 'account-1',
+        'urn:ietf:params:jmap:submission': 'submission-account-1',
+      },
+      accounts: {
+        'account-1': {
+          accountCapabilities: {
+            'urn:ietf:params:jmap:mail': {},
+          },
+        },
+        'submission-account-1': {
+          accountCapabilities: {
+            'urn:ietf:params:jmap:submission': { maxDelayedSend: 3600, submissionExtensions: { FUTURERELEASE: true } },
+          },
+        },
+      },
+    },
+  });
+}
+
 interface JMAPMethodCall {
   0: string;
   1: Record<string, unknown>;
@@ -62,7 +90,7 @@ function mockSendEmailFlow() {
       payload = {
         methodResponses: [
           ['Email/set', { created: { [Object.keys((captured[callIdx].methodCalls[0][1] as { create: Record<string, unknown> }).create)[0]]: { id: 'sent-id-1' } } }, '0'],
-          ['EmailSubmission/set', { created: { '1': { id: 'sub-1' } } }, '1'],
+          ['EmailSubmission/set', { created: { '1': { id: 'sub-1', sendAt: '2026-05-08T18:00:00Z' } } }, '1'],
         ],
       };
     }
@@ -167,4 +195,72 @@ describe('JMAPClient.sendEmail threading headers', () => {
     expect(draft.inReplyTo).toEqual(['real@example.com']);
     expect(draft.references).toBeUndefined();
   });
+
+  it('uses FUTURERELEASE envelope and submission capability for scheduled sends', async () => {
+    const client = createClient();
+    enableDelayedSend(client);
+    const captured = mockSendEmailFlow();
+    const delayedUntil = new Date(Date.now() + 60_000).toISOString();
+
+    const result = await client.sendEmail(
+      ['recipient@example.com'],
+      'Scheduled test',
+      'body',
+      undefined, undefined, 'identity-1', 'user@example.com',
+      undefined, undefined, undefined, undefined,
+      undefined,
+      undefined,
+      delayedUntil,
+    );
+
+    const identityRequest = captured[1];
+    expect(identityRequest.using).toContain('urn:ietf:params:jmap:submission');
+    const submissionCall = captured[2].methodCalls.find(call => call[0] === 'EmailSubmission/set');
+    expect(submissionCall?.[1].accountId).toBe('submission-account-1');
+    expect(submissionCall?.[1].create).toEqual({
+      '1': {
+        emailId: expect.stringMatching(/^#send-/),
+        identityId: 'identity-1',
+        envelope: {
+          mailFrom: {
+            email: 'user@example.com',
+            parameters: { HOLDFOR: expect.stringMatching(/^\d+$/) },
+          },
+          rcptTo: [{ email: 'recipient@example.com' }],
+        },
+      },
+    });
+    expect(JSON.stringify(submissionCall?.[1].create)).not.toContain('sendAt');
+    expect(result).toMatchObject({ scheduled: true, emailSubmissionId: 'sub-1', sendAt: '2026-05-08T18:00:00Z' });
+  });
+
+  it('cleans up replacement submission if canceling the original fails during reschedule', async () => {
+    const client = createClient();
+    enableDelayedSend(client);
+    vi.spyOn(client, 'getMailboxes').mockResolvedValue([
+      { id: 'mb-drafts', name: 'Drafts', role: 'drafts' },
+      { id: 'mb-sent', name: 'Sent', role: 'sent' },
+    ] as never);
+    vi.spyOn(client, 'getIdentities').mockResolvedValue([
+      { id: 'identity-1', name: 'User', email: 'user@example.com', mayDelete: false },
+    ]);
+    const requestSpy = vi.spyOn(client as unknown as { request: JMAPClient['request'] }, 'request')
+      .mockImplementation(async (methodCalls) => {
+        const args = methodCalls[0][1] as { create?: unknown; update?: Record<string, unknown> };
+        if (args.create) {
+          return { methodResponses: [['EmailSubmission/set', { created: { replacement: { id: 'sub-new' } } }, '0']] };
+        }
+        if (args.update?.['sub-old']) {
+          return { methodResponses: [['EmailSubmission/set', { notUpdated: { 'sub-old': { type: 'cannotUnsend' } } }, '0']] };
+        }
+        return { methodResponses: [['EmailSubmission/set', { updated: { 'sub-new': null } }, '0']] };
+      });
+
+    await expect(client.rescheduleEmailSubmission('sub-old', 'email-1', 'identity-1', new Date(Date.now() + 60_000).toISOString()))
+      .rejects.toThrow('could not cancel the original');
+
+    expect(requestSpy).toHaveBeenCalledWith(expect.arrayContaining([
+      expect.arrayContaining(['EmailSubmission/set', expect.objectContaining({ update: { 'sub-new': { undoStatus: 'canceled' } } })]),
+    ]));
+  });
 });

lib/__tests__/oauth-discovery.test.ts

@@ -146,6 +146,23 @@ describe('oauth/discovery', () => {
     expect(consoleSpy).toHaveBeenCalled();
   });
 
+  it('accepts private/loopback endpoints when validateEndpoint is omitted (admin opted in)', async () => {
+    // Split-DNS deployments: mail.example.com resolves to an RFC-1918 address
+    // locally. With the SSRF validator off, discovery must succeed.
+    vi.stubGlobal('fetch', vi.fn().mockResolvedValueOnce({
+      ok: true,
+      json: () => Promise.resolve({
+        issuer: 'https://mail.example.com',
+        authorization_endpoint: 'http://10.0.0.5/authorize',
+        token_endpoint: 'http://10.0.0.5/token',
+      }),
+    }));
+
+    const result = await discoverOAuth('https://mail.example.com');
+
+    expect(result?.token_endpoint).toBe('http://10.0.0.5/token');
+  });
+
   it('caches results - second call for same server URL does not re-fetch', async () => {
     vi.stubGlobal('fetch', vi.fn().mockResolvedValueOnce({
       ok: true,

lib/__tests__/oauth-metadata-route.test.ts

@@ -0,0 +1,101 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import type { OAuthMetadata } from '../oauth/discovery';
+
+// Capture status/headers from NextResponse.json (the shared config-route mock
+// drops them, but this route's behavior depends on the status code).
+vi.mock('next/server', () => ({
+  NextResponse: {
+    json: (data: unknown, init?: { status?: number; headers?: Record<string, string> }) => ({
+      json: async () => data,
+      status: init?.status ?? 200,
+      headers: init?.headers ?? {},
+    }),
+  },
+}));
+
+vi.mock('@/lib/logger', () => ({
+  logger: { warn: vi.fn(), error: vi.fn(), debug: vi.fn() },
+}));
+
+vi.mock('@/lib/admin/config-manager', () => ({
+  configManager: { ensureLoaded: vi.fn().mockResolvedValue(undefined) },
+}));
+
+const getMetadata = vi.fn();
+const getRequiredConfig = vi.fn();
+vi.mock('@/lib/oauth/token-exchange', () => ({
+  getMetadata: (...args: unknown[]) => getMetadata(...args),
+  getRequiredConfig: (...args: unknown[]) => getRequiredConfig(...args),
+}));
+
+const VALID_METADATA: OAuthMetadata = {
+  issuer: 'https://auth.example.com',
+  authorization_endpoint: 'https://auth.example.com/authorize',
+  token_endpoint: 'https://auth.example.com/token',
+};
+
+function mockRequest(serverId?: string): unknown {
+  return {
+    nextUrl: {
+      searchParams: { get: (k: string) => (k === 'server_id' ? serverId ?? null : null) },
+    },
+  };
+}
+
+async function callRoute(serverId?: string) {
+  const { GET } = await import('@/app/api/auth/oauth/metadata/route');
+  const res = (await GET(mockRequest(serverId) as Parameters<typeof GET>[0])) as unknown as {
+    status: number;
+    headers: Record<string, string>;
+    json: () => Promise<Record<string, unknown>>;
+  };
+  return { status: res.status, headers: res.headers, body: await res.json() };
+}
+
+describe('oauth metadata route', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    getRequiredConfig.mockReturnValue({ discoveryUrl: 'https://auth.example.com' });
+  });
+
+  it('returns discovered metadata for the resolved server', async () => {
+    getMetadata.mockResolvedValue(VALID_METADATA);
+
+    const { status, body, headers } = await callRoute('server-1');
+
+    expect(status).toBe(200);
+    expect(body).toEqual(VALID_METADATA);
+    expect(headers['Cache-Control']).toContain('max-age=600');
+    expect(getMetadata).toHaveBeenCalledWith('server-1');
+  });
+
+  it('returns 404 when OAuth is not configured', async () => {
+    getRequiredConfig.mockImplementation(() => {
+      throw new Error('OAuth misconfigured: OAUTH_CLIENT_ID not set');
+    });
+
+    const { status, body } = await callRoute();
+
+    expect(status).toBe(404);
+    expect(body).toEqual({ error: 'OAuth not configured' });
+    expect(getMetadata).not.toHaveBeenCalled();
+  });
+
+  it('returns 502 when discovery yields no usable endpoints', async () => {
+    getMetadata.mockResolvedValue(null);
+
+    const { status, body } = await callRoute();
+
+    expect(status).toBe(502);
+    expect(body).toEqual({ error: 'OAuth discovery failed' });
+  });
+
+  it('returns 502 when discovery throws', async () => {
+    getMetadata.mockRejectedValue(new Error('network down'));
+
+    const { status, body } = await callRoute();
+
+    expect(status).toBe(502);
+    expect(body).toEqual({ error: 'OAuth discovery failed' });
+  });
+});

lib/__tests__/shared-calendar-colors.test.ts

@@ -0,0 +1,77 @@
+import { describe, it, expect } from 'vitest';
+import type { Calendar } from '@/lib/jmap/types';
+import {
+  CALENDAR_COLORS,
+  sharedCalendarColorKey,
+  pickUnusedCalendarColor,
+} from '../shared-calendar-colors';
+
+function makeCal(overrides: Partial<Calendar>): Calendar {
+  return {
+    id: 'cal-1',
+    name: 'Cal',
+    description: null,
+    color: null,
+    sortOrder: 0,
+    isSubscribed: true,
+    isVisible: true,
+    isDefault: false,
+    includeInAvailability: 'all',
+    defaultAlertsWithTime: null,
+    defaultAlertsWithoutTime: null,
+    timeZone: null,
+    shareWith: null,
+    myRights: {} as Calendar['myRights'],
+    ...overrides,
+  };
+}
+
+describe('sharedCalendarColorKey', () => {
+  it('is built from local account, JMAP account, and the original id', () => {
+    const cal = makeCal({
+      id: 'acct-9:cal-7',
+      originalId: 'cal-7',
+      accountId: 'acct-9',
+      localAccountId: 'slot-2',
+    });
+    expect(sharedCalendarColorKey(cal)).toBe('slot-2|acct-9|cal-7');
+  });
+
+  it('is stable regardless of the Pro-shell id prefix', () => {
+    // Same underlying calendar, shown once under the active account (bare id)
+    // and once cross-account (prefixed id) - both must map to one key.
+    const active = makeCal({ id: 'acct-9:cal-7', originalId: 'cal-7', accountId: 'acct-9', localAccountId: 'slot-2' });
+    const prefixed = makeCal({ id: 'slot-2::acct-9:cal-7', originalId: 'cal-7', accountId: 'acct-9', localAccountId: 'slot-2' });
+    expect(sharedCalendarColorKey(active)).toBe(sharedCalendarColorKey(prefixed));
+  });
+
+  it('falls back to the id when originalId is absent', () => {
+    const cal = makeCal({ id: 'cal-7', accountId: 'acct-9' });
+    expect(sharedCalendarColorKey(cal)).toBe('|acct-9|cal-7');
+  });
+});
+
+describe('pickUnusedCalendarColor', () => {
+  it('returns a palette color not present in usedColors', () => {
+    const used = CALENDAR_COLORS.slice(0, CALENDAR_COLORS.length - 1);
+    const picked = pickUnusedCalendarColor(used);
+    expect(picked).toBe(CALENDAR_COLORS[CALENDAR_COLORS.length - 1]);
+  });
+
+  it('ignores case when comparing used colors', () => {
+    const used = CALENDAR_COLORS.slice(0, -1).map((c) => c.toUpperCase());
+    expect(pickUnusedCalendarColor(used)).toBe(CALENDAR_COLORS[CALENDAR_COLORS.length - 1]);
+  });
+
+  it('still returns a palette color once every color is taken', () => {
+    expect(CALENDAR_COLORS).toContain(pickUnusedCalendarColor(CALENDAR_COLORS));
+  });
+
+  it('always returns a valid palette color for a small used set', () => {
+    for (let i = 0; i < 50; i++) {
+      const picked = pickUnusedCalendarColor(['#3b82f6']);
+      expect(CALENDAR_COLORS).toContain(picked);
+      expect(picked).not.toBe('#3b82f6');
+    }
+  });
+});

lib/__tests__/signature-utils.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, it } from 'vitest';
 
 import {
+  appendHtmlSignature,
   appendPlainTextSignature,
   getPlainTextSignature,
   hasMeaningfulHtmlBody,
@@ -27,6 +28,27 @@ describe('signature-utils', () => {
     });
   });
 
+  describe('appendHtmlSignature', () => {
+    it('appends a sanitized html signature, preserving formatting', () => {
+      expect(appendHtmlSignature('<div>Hello</div>', { htmlSignature: '<strong>Alice</strong>' }))
+        .toBe('<div>Hello</div><br><br>-- <br><strong>Alice</strong>');
+    });
+
+    it('escapes and appends a text signature when no html signature exists', () => {
+      expect(appendHtmlSignature('<div>Hello</div>', { textSignature: 'Alice\nEng' }))
+        .toBe('<div>Hello</div><br><br>-- <br>Alice<br>Eng');
+    });
+
+    it('omits the separator marker when disabled', () => {
+      expect(appendHtmlSignature('<div>Hi</div>', { htmlSignature: '<strong>A</strong>' }, { separator: false }))
+        .toBe('<div>Hi</div><br><br><strong>A</strong>');
+    });
+
+    it('leaves the body untouched when no signature exists', () => {
+      expect(appendHtmlSignature('<div>Hi</div>', {})).toBe('<div>Hi</div>');
+    });
+  });
+
   describe('hasMeaningfulHtmlBody', () => {
     it('prefers html bodies that preserve signature formatting', () => {
       expect(hasMeaningfulHtmlBody('<div>Hello</div><br><p>Alice</p>')).toBe(true);

lib/admin/domain-branding.ts

@@ -0,0 +1,148 @@
+/**
+ * Per-domain branding overrides: schema, parsing, host extraction, and match.
+ *
+ * The webmail can be served on multiple hostnames (e.g. mail1.example.com,
+ * mail2.other.com). Each hostname can override a subset of branding fields;
+ * unset fields fall back to the global admin/env/default value.
+ */
+
+import type { NextRequest } from 'next/server';
+
+/** Config keys that can be overridden per domain. */
+export const BRANDING_OVERRIDE_KEYS = [
+  'appName',
+  'appShortName',
+  'appDescription',
+  'faviconUrl',
+  'pwaIconUrl',
+  'pwaScreenshotMobileUrl',
+  'pwaScreenshotDesktopUrl',
+  'pwaThemeColor',
+  'pwaBackgroundColor',
+  'appLogoLightUrl',
+  'appLogoDarkUrl',
+  'loginLogoLightUrl',
+  'loginLogoDarkUrl',
+  'loginCompanyName',
+  'loginImprintUrl',
+  'loginPrivacyPolicyUrl',
+  'loginWebsiteUrl',
+] as const;
+
+export type BrandingOverrideKey = (typeof BRANDING_OVERRIDE_KEYS)[number];
+
+export interface DomainBrandingEntry {
+  /**
+   * Hostname this entry applies to. Either an exact host like
+   * "mail.example.com" or a wildcard like "*.example.com" (matches any
+   * direct or deeper subdomain). Case-insensitive; trailing dots are
+   * stripped on parse.
+   */
+  host: string;
+  appName?: string;
+  appShortName?: string;
+  appDescription?: string;
+  faviconUrl?: string;
+  pwaIconUrl?: string;
+  pwaScreenshotMobileUrl?: string;
+  pwaScreenshotDesktopUrl?: string;
+  pwaThemeColor?: string;
+  pwaBackgroundColor?: string;
+  appLogoLightUrl?: string;
+  appLogoDarkUrl?: string;
+  loginLogoLightUrl?: string;
+  loginLogoDarkUrl?: string;
+  loginCompanyName?: string;
+  loginImprintUrl?: string;
+  loginPrivacyPolicyUrl?: string;
+  loginWebsiteUrl?: string;
+}
+
+// Accepts plain hostnames (foo, foo.bar, foo.bar.baz) and one-level wildcards
+// at the leftmost label (*.example.com). Rejects IPs, scheme/path/userinfo,
+// and embedded wildcards.
+const HOST_RE = /^(\*\.)?[a-z0-9]([a-z0-9-]*[a-z0-9])?(\.[a-z0-9]([a-z0-9-]*[a-z0-9])?)*$/;
+
+function normalizeHost(host: string): string {
+  return host.trim().toLowerCase().replace(/\.+$/, '');
+}
+
+/** Parse the raw config value (array of entries, or string-JSON). Invalid entries are dropped. */
+export function parseDomainBranding(raw: unknown): DomainBrandingEntry[] {
+  if (!raw) return [];
+  let value = raw;
+  if (typeof value === 'string') {
+    if (!value.trim()) return [];
+    try {
+      value = JSON.parse(value);
+    } catch {
+      return [];
+    }
+  }
+  if (!Array.isArray(value)) return [];
+
+  const seen = new Set<string>();
+  const out: DomainBrandingEntry[] = [];
+  for (const item of value) {
+    if (!item || typeof item !== 'object') continue;
+    const rec = item as Record<string, unknown>;
+    const rawHost = typeof rec.host === 'string' ? rec.host : '';
+    const host = normalizeHost(rawHost);
+    if (!host || !HOST_RE.test(host)) continue;
+    if (seen.has(host)) continue;
+    seen.add(host);
+
+    const entry: DomainBrandingEntry = { host };
+    const writable = entry as unknown as Record<string, string>;
+    for (const key of BRANDING_OVERRIDE_KEYS) {
+      const v = rec[key];
+      if (typeof v === 'string' && v.length > 0) {
+        writable[key] = v;
+      }
+    }
+    out.push(entry);
+  }
+  return out;
+}
+
+type HeadersLike = Headers | { get(name: string): string | null };
+
+/**
+ * Pick the request's host, preferring X-Forwarded-Host (first entry if
+ * comma-separated) over Host. Strips the port. Returns null when no usable
+ * host header is set.
+ */
+export function pickRequestHost(headersOrReq: NextRequest | HeadersLike): string | null {
+  const headers: HeadersLike = 'headers' in headersOrReq ? (headersOrReq as NextRequest).headers : headersOrReq;
+  const raw = headers.get('x-forwarded-host') || headers.get('host');
+  if (!raw) return null;
+  const first = raw.split(',')[0]?.trim();
+  if (!first) return null;
+  return normalizeHost(first.split(':')[0]);
+}
+
+/**
+ * Find the entry whose host matches `host`. Exact match always wins; among
+ * wildcards the longest (most-specific) suffix wins. Returns {} when no
+ * entry matches.
+ */
+export function matchDomainBranding(
+  host: string | null,
+  entries: DomainBrandingEntry[],
+): Partial<DomainBrandingEntry> {
+  if (!host || entries.length === 0) return {};
+  const lower = normalizeHost(host);
+  let wildcardMatch: DomainBrandingEntry | undefined;
+  for (const entry of entries) {
+    if (entry.host === lower) return entry;
+    if (entry.host.startsWith('*.')) {
+      const suffix = entry.host.slice(1); // ".example.com"
+      if (lower.endsWith(suffix) && lower.length > suffix.length) {
+        if (!wildcardMatch || entry.host.length > wildcardMatch.host.length) {
+          wildcardMatch = entry;
+        }
+      }
+    }
+  }
+  return wildcardMatch ?? {};
+}