Merge branch 'main' into HEAD

# Conflicts:
#	app/(main)/layout.tsx
#	locales/cs/common.json
#	locales/da/common.json
#	locales/de/common.json
#	locales/en/common.json
#	locales/es/common.json
#	locales/fr/common.json
#	locales/it/common.json
#	locales/ja/common.json
#	locales/ko/common.json
#	locales/lv/common.json
#	locales/nl/common.json
#	locales/pl/common.json
#	locales/pt/common.json
#	locales/ru/common.json
#	locales/tr/common.json
#	locales/uk/common.json
#	locales/zh/common.json

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]/page.tsx

@@ -55,7 +55,7 @@ import { useProMultiAccountMailboxes } from "@/hooks/use-pro-multi-account-mailb
 import { Input } from "@/components/ui/input";
 import { FilePreviewModal } from "@/components/files/file-preview-modal";
 import { isFilePreviewable } from "@/lib/file-preview";
-import { appendPlainTextSignature } from "@/lib/signature-utils";
+import { appendHtmlSignature, appendPlainTextSignature } from "@/lib/signature-utils";
 import { computeReplyThreadingHeaders } from "@/lib/email-threading";
 import { EML_IMPORT_ACCEPT, expandImportableEmails } from "@/lib/eml-import";
 import { resolveReplyFrom } from "@/lib/reply-identity";
@@ -72,6 +72,7 @@ import { plainTextToComposerBody } from "@/lib/email-composer-utils";
 import { appLifecycleHooks, uiHooks, routerHooks, toastHooks, emailHooks } from "@/lib/plugin-hooks";
 import { emailToReadView } from "@/lib/plugin-projection";
 import { buildQuoteHeader } from "@/lib/quote-header";
+import { buildReplySubject, buildForwardSubject } from "@/lib/subject-prefix";
 import { useLocaleStore } from "@/stores/locale-store";
 import type { QuoteHeader } from "@/lib/plugin-types";
 
@@ -81,6 +82,7 @@ const SCHEDULED_MAILBOX_ID = '__scheduled__';
 export default function Home() {
   const t = useTranslations();
   const tCommon = useTranslations('common');
+  const tQuote = useTranslations('quote_header');
   const { appName } = useConfig();
   const mailLayout = useSettingsStore((state) => state.mailLayout);
   const [showComposer, setShowComposer] = useState(false);
@@ -751,9 +753,9 @@ export default function Home() {
     let title = t('email_composer.new_message');
     if (baseSubject) {
       if (effectiveMode === 'reply' || effectiveMode === 'replyAll') {
-        title = baseSubject.startsWith('Re:') ? baseSubject : `Re: ${baseSubject}`;
+        title = buildReplySubject(baseSubject, t('email_composer.prefix.reply'));
       } else if (effectiveMode === 'forward') {
-        title = baseSubject.startsWith('Fwd:') ? baseSubject : `Fwd: ${baseSubject}`;
+        title = buildForwardSubject(baseSubject, t('email_composer.prefix.forward'));
       } else {
         title = baseSubject;
       }
@@ -1129,6 +1131,7 @@ export default function Home() {
     inReplyTo?: string[];
     references?: string[];
     delayedUntil?: string;
+    requestReadReceipt?: boolean;
   }) => {
     if (!client) return;
 
@@ -1136,7 +1139,7 @@ export default function Home() {
       const effectiveMode = pendingDraft?.mode ?? composerMode;
       const originalEmailId = selectedEmail?.id;
 
-      const result = await sendEmail(client, data.to, data.subject, data.body, data.cc, data.bcc, data.identityId, data.fromEmail, data.draftId, data.fromName, data.htmlBody, data.attachments, data.inReplyTo, data.references, data.delayedUntil, data.envelopeMailFrom);
+      const result = await sendEmail(client, data.to, data.subject, data.body, data.cc, data.bcc, data.identityId, data.fromEmail, data.draftId, data.fromName, data.htmlBody, data.attachments, data.inReplyTo, data.references, data.delayedUntil, data.envelopeMailFrom, { requestReadReceipt: data.requestReadReceipt });
       setShowComposer(false);
       if (result.scheduled) {
         await refreshScheduledMetadata(client);
@@ -1212,13 +1215,20 @@ export default function Home() {
         locale: useLocaleStore.getState().locale,
         timeFormat: useSettingsStore.getState().timeFormat,
         unknownLabel: tCommon('unknown'),
+        labels: {
+          formatReplyLine: (vars) => tQuote('reply_line', vars),
+          forwardedSeparator: tQuote('forwarded_separator'),
+          fromLabel: tQuote('from_label'),
+          dateLabel: tQuote('date_label'),
+          subjectLabel: tQuote('subject_label'),
+        },
       });
       setComposerQuoteHeader(header);
     } catch (err) {
       console.warn('[quote-header] plugin transform failed; using default', err);
       setComposerQuoteHeader(null);
     }
-  }, [tCommon]);
+  }, [tCommon, tQuote]);
 
   // Force a clean composer remount on every fresh entry point so prior
   // compose state can't bleed into the new session (#329 C). The composer is
@@ -2090,9 +2100,21 @@ export default function Home() {
 
     // Append signature from the sending identity (fall back to primary
     // when the reply-from lives on the same identity but a different alias).
-    const finalBody = appendPlainTextSignature(body, sendingIdentity, {
-      separator: useSettingsStore.getState().signatureSeparatorEnabled,
-    });
+    const separator = useSettingsStore.getState().signatureSeparatorEnabled;
+    const finalBody = appendPlainTextSignature(body, sendingIdentity, { separator });
+
+    // When the identity has an HTML signature, send a matching HTML body so the
+    // signature keeps its formatting; appendPlainTextSignature would otherwise
+    // flatten it to plain text. Text-only identities keep the plain-text-only
+    // behavior (htmlBody stays undefined).
+    const escapedBody = body
+      .replace(/&/g, '&')
+      .replace(/</g, '&lt;')
+      .replace(/>/g, '&gt;')
+      .replace(/\n/g, '<br>');
+    const finalHtmlBody = sendingIdentity?.htmlSignature?.trim()
+      ? appendHtmlSignature(`<div>${escapedBody}</div>`, sendingIdentity, { separator })
+      : undefined;
 
     const originalEmailId = selectedEmail.id;
     const sendDelaySeconds = useSettingsStore.getState().sendDelaySeconds;
@@ -2116,7 +2138,7 @@ export default function Home() {
     const result = await sendEmail(
       client,
       [sender.email],
-      `Re: ${selectedEmail.subject || "(no subject)"}`,
+      buildReplySubject(selectedEmail.subject || "(no subject)", t('email_composer.prefix.reply')),
       finalBody,
       undefined,
       undefined,
@@ -2124,7 +2146,7 @@ export default function Home() {
       headerFromEmail,
       undefined,
       headerFromName,
-      undefined,
+      finalHtmlBody,
       undefined,
       threading?.inReplyTo,
       threading?.references,

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

@@ -2,7 +2,7 @@
 
 import { useEffect, useMemo, useRef, useState } from '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,
@@ -33,6 +33,8 @@ const TEXT_FIELDS = [
 
 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 = [
@@ -528,7 +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'; }}
@@ -606,7 +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'; }}

app/(main)/layout.tsx

@@ -2,7 +2,6 @@ import type { Metadata, Viewport } from "next";
 import { Geist, Geist_Mono } from "next/font/google";
 import { headers } from "next/headers";
 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";
@@ -111,7 +110,6 @@ export default async function RootLayout({
       >
         <ServiceWorkerRegistration />
         {children}
-        <PWAInstallPrompt />
       </body>
     </html>
   );

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({
-  variable: '--font-geist-sans',
-  subsets: ['latin'],
-});
-
-const geistMono = Geist_Mono({
-  variable: '--font-geist-mono',
-  subsets: ['latin'],
-});
+// The plugin sandbox iframe runs with an opaque origin (the `sandbox`
+// attribute in production excludes `allow-same-origin` for isolation). Any
+// 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:
+// no font imports, no CSS imports. Plugins ship their own styles, and both the
+// plugin bundle and all host API calls travel over the postMessage RPC bridge,
+// 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
-        className={`${geistSans.variable} ${geistMono.variable} antialiased`}
-        style={{ margin: 0, padding: 0, background: 'transparent' }}
-      >
+      <body style={{ margin: 0, padding: 0, background: 'transparent' }}>
         {children}
       </body>
     </html>

app/api/admin/branding/route.ts

@@ -26,14 +26,18 @@ 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<BrandingOverrideKey>([
+const VALID_SLOTS = new Set<UploadSlot>([
   'faviconUrl',
   'pwaIconUrl',
   'appLogoLightUrl',
   'appLogoDarkUrl',
   'loginLogoLightUrl',
   'loginLogoDarkUrl',
+  'pwaScreenshotMobileUrl',
+  'pwaScreenshotDesktopUrl',
 ]);
 
 const EXT_BY_MIME: Record<string, string> = {
@@ -131,7 +135,7 @@ export async function POST(request: NextRequest) {
       return NextResponse.json({ error: 'Missing file or slot' }, { status: 400 });
     }
 
-    if (!VALID_SLOTS.has(slot as BrandingOverrideKey)) {
+    if (!VALID_SLOTS.has(slot as UploadSlot)) {
       return NextResponse.json({ error: `Invalid slot: ${slot}` }, { status: 400 });
     }
 
@@ -226,7 +230,7 @@ export async function DELETE(request: NextRequest) {
     const slot = body.slot;
     const rawHost = body.host ?? '';
 
-    if (!slot || !VALID_SLOTS.has(slot as BrandingOverrideKey)) {
+    if (!slot || !VALID_SLOTS.has(slot as UploadSlot)) {
       return NextResponse.json({ error: 'Invalid or missing slot' }, { status: 400 });
     }
 

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

@@ -723,7 +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',
@@ -1562,13 +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)) {
-      created[key] = { id: `identity-new-${Date.now()}-${key}` };
+    for (const [key, data] of Object.entries(create)) {
+      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 {

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-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/manifest.ts

@@ -95,10 +95,25 @@ export default async function manifest(): Promise<ExtendedManifest> {
     background_color: backgroundColor,
     icons,
     categories: ["productivity"],
-    screenshots: [
-      { src: withBase("/screenshot-540x720.png"), sizes: "540x720", type: "image/png" },
-      { src: withBase("/screenshot-1280x720.png"), sizes: "1280x720", type: "image/png" },
-    ],
+    // Use admin-uploaded screenshots when configured (per-domain override,
+    // admin/env global; resized on the fly via /api/pwa-screenshot/[variant]);
+    // 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/email/email-composer.tsx

@@ -5,11 +5,12 @@ 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, CalendarClock, ChevronDown } 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 { buildReplySubject, buildForwardSubject } from "@/lib/subject-prefix";
 import { emailHooks, contactHooks } from "@/lib/plugin-hooks";
 import type { OutgoingEmail, RecipientSuggestion } from "@/lib/plugin-types";
 import { useAuthStore } from "@/stores/auth-store";
@@ -89,6 +90,7 @@ interface EmailComposerProps {
     inReplyTo?: string[];
     references?: string[];
     delayedUntil?: string;
+    requestReadReceipt?: boolean;
   }) => void | Promise<void>;
   onScheduledSendCreated?: () => void | Promise<void>;
   onClose?: () => void;
@@ -196,6 +198,7 @@ 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);
@@ -205,6 +208,7 @@ export function EmailComposer({
   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
@@ -265,11 +269,9 @@ export function EmailComposer({
   const getInitialSubject = () => {
     if (!replyTo?.subject) return "";
     if (mode === 'forward') {
-      const fwdPrefix = t('prefix.forward');
-      return `${fwdPrefix} ${replyTo.subject.replace(/^(Fwd:\s*|Tr:\s*)+/i, '')}`;
+      return buildForwardSubject(replyTo.subject, t('prefix.forward'));
     } else if (mode === 'reply' || mode === 'replyAll') {
-      const rePrefix = t('prefix.reply');
-      return `${rePrefix} ${replyTo.subject.replace(/^(Re:\s*)+/i, '')}`;
+      return buildReplySubject(replyTo.subject, t('prefix.reply'));
     }
     return "";
   };
@@ -291,6 +293,13 @@ export function EmailComposer({
       const date = replyTo.receivedAt ? formatDateTime(replyTo.receivedAt, timeFormat, { weekday: 'short', year: 'numeric', month: 'short', day: 'numeric' }) : "";
       const from = replyTo.from?.[0];
       const fromStr = from ? `${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');
@@ -311,9 +320,9 @@ 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;
     }
@@ -336,6 +345,11 @@ export function EmailComposer({
     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,
@@ -359,8 +373,8 @@ export function EmailComposer({
     // 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>`
-        : `On ${date}, ${fromStr} wrote:<br>`;
+        ? `${tQuote('forwarded_separator')}<br>${tQuote('from_label')}: ${fromStrFull}<br>${tQuote('date_label')}: ${date}<br>${tQuote('subject_label')}: ${replyTo.subject || ''}<br><br>`
+        : `${tQuote('reply_line', { date, from: fromStr })}<br>`;
       // cid: image refs are rewritten so they render in the editor (browsers
       // can't fetch cid: URLs); see useEffect below for the data-URL backfill.
       const quotedHtml = rewriteCidImagesForEditor(replyTo.htmlBody);
@@ -370,9 +384,9 @@ export function EmailComposer({
     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;
@@ -385,6 +399,7 @@ 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
@@ -1657,6 +1672,7 @@ export function EmailComposer({
           attachments: uploadedAttachments.length > 0 ? uploadedAttachments : undefined,
           inReplyTo: threadingHeaders?.inReplyTo,
           references: threadingHeaders?.references,
+          requestReadReceipt,
           delayedUntil: effectiveDelayedUntil,
         });
 
@@ -2218,7 +2234,7 @@ 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
@@ -2281,6 +2297,21 @@ 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>
 

components/email/email-viewer.tsx

@@ -83,6 +83,8 @@ 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";
@@ -911,6 +913,7 @@ 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(), []);
@@ -2193,6 +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,
@@ -3252,6 +3258,103 @@ 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 (
@@ -4946,9 +5049,10 @@ 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">
@@ -5003,6 +5107,17 @@ 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">

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/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(
-      (c) => c.value.trim()
-    );
+    // While editing, condition.value is always the raw string typed into the
+    // 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)) {
-          updated.comparator = "greater_than";
-        }
-        if (updates.field && updates.field !== "size" && SIZE_COMPARATORS.includes(c.comparator)) {
-          updated.comparator = "contains";
+        // Reconcile the comparator when the field changes so we never end up
+        // 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 !== c.field) {
+          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(
-                      (c) => (
-                        <option key={c} value={c}>
-                          {t(`comparators.${c}`)}
-                        </option>
-                      )
-                    )}
+                    {comparatorsFor(condition.field).map((c) => (
+                      <option key={c} value={c}>
+                        {t(`comparators.${c}`)}
+                      </option>
+                    ))}
                   </select>
 
-                  <Input
-                    value={condition.value}
-                    onChange={(e) => updateCondition(index, { value: e.target.value })}
-                    placeholder={
-                      condition.field === "size" ? t("size_placeholder") : t("header_placeholder")
-                    }
-                    className="flex-1 min-w-[120px]"
-                    type={condition.field === "size" ? "number" : "text"}
-                  />
+                  {/* has_any takes no value; render a stub so the row layout
+                      stays consistent but no input is editable. */}
+                  {condition.field === "attachment" && condition.comparator === "has_any" ? (
+                    <div className="flex-1 min-w-[120px]" />
+                  ) : (
+                    <Input
+                      value={valueToInputString(condition.value)}
+                      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/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)',
-          color: 'var(--foreground, #0f172a)',
-          border: '1px solid var(--border, #e2e8f0)',
+          background: 'var(--color-popover, #fff)',
+          color: 'var(--color-popover-foreground, #0f172a)',
+          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' }}>
-          {current.message}
+        <p style={{ fontSize: 13, lineHeight: 1.5, margin: '0 0 16px 0', color: 'var(--color-muted-foreground, #64748b)', whiteSpace: 'pre-wrap', overflowWrap: 'anywhere' }}>
+          {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',
-              color: '#fff',
+              background: current.danger ? 'var(--color-destructive, #dc2626)' : 'var(--color-primary, #3b82f6)',
+              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/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

@@ -1,6 +1,7 @@
 "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";
@@ -17,6 +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;
@@ -84,17 +86,17 @@ export function PWAInstallPrompt() {
           )}
           <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>
@@ -105,20 +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/composing-settings.tsx

@@ -28,6 +28,8 @@ export function ComposingSettings() {
     subAddressDelimiter,
     signaturePosition,
     signatureSeparatorEnabled,
+    requestReadReceiptDefault,
+    readReceiptResponse,
     updateSetting,
   } = useSettingsStore();
   const { client } = useAuthStore();
@@ -78,6 +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/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>
           );

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

@@ -15,6 +15,8 @@ export const BRANDING_OVERRIDE_KEYS = [
   'appDescription',
   'faviconUrl',
   'pwaIconUrl',
+  'pwaScreenshotMobileUrl',
+  'pwaScreenshotDesktopUrl',
   'pwaThemeColor',
   'pwaBackgroundColor',
   'appLogoLightUrl',
@@ -42,6 +44,8 @@ export interface DomainBrandingEntry {
   appDescription?: string;
   faviconUrl?: string;
   pwaIconUrl?: string;
+  pwaScreenshotMobileUrl?: string;
+  pwaScreenshotDesktopUrl?: string;
   pwaThemeColor?: string;
   pwaBackgroundColor?: string;
   appLogoLightUrl?: string;

lib/admin/plugin-registry.ts

@@ -53,6 +53,13 @@ export interface ServerPlugin {
   forceEnabled?: boolean;
   configSchema?: Record<string, PluginConfigField>;
   settingsSchema?: Record<string, PluginSettingsField>;
+  /**
+   * Optional per-locale translation tables (locale -> key -> string) declared
+   * in the plugin manifest. Surfaced to the sandbox so plugin code can call
+   * `api.i18n.t(key)`; without it a plugin's strings stay in its hardcoded
+   * default language.
+   */
+  locales?: Record<string, Record<string, string>>;
   installedAt: string;
   updatedAt: string;
   /**

lib/admin/types.ts

@@ -142,6 +142,8 @@ export const CONFIG_ENV_MAP: Record<string, { envVar: string; fileEnvVar?: strin
   devMode: { envVar: 'DEV_MOCK_JMAP', type: 'boolean', defaultValue: false },
   faviconUrl: { envVar: 'FAVICON_URL', type: 'url', defaultValue: '/branding/Bulwark_Favicon.svg' },
   pwaIconUrl: { envVar: 'PWA_ICON_URL', type: 'url', defaultValue: '' },
+  pwaScreenshotMobileUrl: { envVar: 'PWA_SCREENSHOT_MOBILE_URL', type: 'url', defaultValue: '' },
+  pwaScreenshotDesktopUrl: { envVar: 'PWA_SCREENSHOT_DESKTOP_URL', type: 'url', defaultValue: '' },
   pwaThemeColor: { envVar: 'PWA_THEME_COLOR', type: 'string', defaultValue: '#ffffff' },
   pwaBackgroundColor: { envVar: 'PWA_BACKGROUND_COLOR', type: 'string', defaultValue: '#ffffff' },
   appLogoLightUrl: { envVar: 'APP_LOGO_LIGHT_URL', type: 'url', defaultValue: '' },

lib/demo/demo-client.ts

@@ -530,6 +530,14 @@ export class DemoJMAPClient implements IJMAPClient {
     return { blobId, size: file.size, type: file.type };
   }
 
+  async importEmail(): Promise<string | null> {
+    return generateDemoId('email');
+  }
+
+  async sendReadReceipt(): Promise<void> {
+    // Demo mode: no real network send.
+  }
+
   getBlobDownloadUrl(blobId: string): string {
     return `data:application/octet-stream;demo-blob=${blobId}`;
   }

lib/jmap/client-interface.ts

@@ -150,8 +150,30 @@ export interface IJMAPClient {
     references?: string[],
     delayedUntil?: string,
     envelopeMailFrom?: string,
+    options?: { requestReadReceipt?: boolean },
   ): Promise<SendEmailResult>;
 
+  importEmail(
+    blobId: string,
+    mailboxIds: Record<string, boolean>,
+    keywords?: Record<string, boolean>,
+    accountId?: string,
+  ): Promise<string | null>;
+
+  sendReadReceipt(params: {
+    to: string;
+    fromEmail: string;
+    fromName?: string;
+    identityId: string;
+    originalMessageId?: string | string[];
+    originalSubject?: string;
+    originalRecipient?: string;
+    automatic?: boolean;
+    accountId?: string;
+    subject?: string;
+    humanText?: string;
+  }): Promise<void>;
+
   sendRawEmail(blob: Blob, identityId: string, sentMailboxId: string, draftMailboxId?: string, delayedUntil?: string, envelopeRecipients?: string[]): Promise<SendEmailResult>;
   getScheduledEmails(limit?: number, position?: number): Promise<{ emails: ScheduledEmail[]; hasMore: boolean; total: number; nextPosition: number }>;
   cancelEmailSubmission(submissionId: string): Promise<void>;

lib/jmap/client.ts

@@ -2149,7 +2149,8 @@ export class JMAPClient implements IJMAPClient {
     inReplyTo?: string[],
     references?: string[],
     delayedUntil?: string,
-    envelopeMailFrom?: string
+    envelopeMailFrom?: string,
+    options?: { requestReadReceipt?: boolean }
   ): Promise<SendEmailResult> {
     const holdForSeconds = delayedUntil ? this.validateDelayedUntil(delayedUntil) : undefined;
     const emailId = `send-${Date.now()}`;
@@ -2219,6 +2220,13 @@ export class JMAPClient implements IJMAPClient {
       mailboxIds: { [draftsMailbox.id]: true },
     };
 
+    if (options?.requestReadReceipt) {
+      // RFC 8098: ask the recipient's client to return a Message Disposition
+      // Notification to our address. JMAP lets us set the raw header on create
+      // via the "header:<Name>:asText" property form.
+      emailCreate["header:Disposition-Notification-To:asText"] = fromEmail || this.username;
+    }
+
     if (htmlBody) {
       // Send as multipart/alternative with both text and HTML
       emailCreate.bodyValues = {
@@ -3007,6 +3015,108 @@ export class JMAPClient implements IJMAPClient {
     throw new Error('Invalid upload response: blobId not found');
   }
 
+  /**
+   * Import a raw RFC822 message (referenced by a previously-uploaded blob) into
+   * one or more mailboxes. Returns the new email id. Used for sending MDNs,
+   * where the exact MIME bytes must be preserved (Email/set can't express a
+   * multipart/report report-type parameter reliably).
+   */
+  async importEmail(
+    blobId: string,
+    mailboxIds: Record<string, boolean>,
+    keywords?: Record<string, boolean>,
+    accountId?: string
+  ): Promise<string | null> {
+    const targetAccountId = accountId || this.accountId;
+    const creationId = `imp-${Date.now()}`;
+    const response = await this.request([
+      ["Email/import", {
+        accountId: targetAccountId,
+        emails: {
+          [creationId]: { blobId, mailboxIds, keywords: keywords || { "$seen": true } },
+        },
+      }, "0"],
+    ]);
+    const res = response.methodResponses?.[0];
+    if (res?.[0] !== "Email/import") {
+      console.error('Email/import: unexpected response', res);
+      return null;
+    }
+    const payload = res[1] as {
+      created?: Record<string, { id: string }>;
+      notCreated?: Record<string, { type?: string; description?: string }>;
+    };
+    const created = payload?.created?.[creationId];
+    if (!created) {
+      const reason = payload?.notCreated?.[creationId];
+      console.error('Email/import failed:', reason || payload);
+      throw new Error(`Email/import: ${reason?.description || reason?.type || 'unknown error'}`);
+    }
+    return created.id;
+  }
+
+  /**
+   * Send an RFC 8098 Message Disposition Notification (read receipt) in reply
+   * to a message that carried a Disposition-Notification-To header. Builds the
+   * multipart/report, uploads it as a blob, imports it into Sent, then submits
+   * it with an explicit envelope (MAIL FROM = our identity, RCPT TO = the
+   * requesting address).
+   */
+  async sendReadReceipt(params: {
+    to: string;
+    fromEmail: string;
+    fromName?: string;
+    identityId: string;
+    originalMessageId?: string | string[];
+    originalSubject?: string;
+    originalRecipient?: string;
+    automatic?: boolean;
+    accountId?: string;
+    subject?: string;
+    humanText?: string;
+  }): Promise<void> {
+    const targetAccountId = params.accountId || this.accountId;
+    const { buildMdnMessage } = await import("@/lib/mdn");
+    const raw = buildMdnMessage(params);
+
+    const file = new File([raw], "receipt.eml", { type: "message/rfc822" });
+    const { blobId } = await this.uploadBlob(file);
+
+    const mailboxes = await this.getMailboxes();
+    const targetMailbox = mailboxes.find(mb => mb.role === 'sent') || mailboxes[0];
+    if (!targetMailbox) throw new Error('No mailbox available for MDN import');
+
+    const emailId = await this.importEmail(
+      blobId,
+      { [targetMailbox.id]: true },
+      { "$seen": true },
+      targetAccountId
+    );
+    if (!emailId) throw new Error('MDN import failed');
+
+    const subId = `mdnsub-${Date.now()}`;
+    const response = await this.request([
+      ["EmailSubmission/set", {
+        accountId: targetAccountId,
+        create: {
+          [subId]: {
+            emailId,
+            identityId: params.identityId,
+            envelope: {
+              mailFrom: { email: params.fromEmail },
+              rcptTo: [{ email: params.to }],
+            },
+          },
+        },
+      }, "0"],
+    ]);
+    const subRes = response.methodResponses?.[0];
+    const notCreated = (subRes?.[1] as { notCreated?: Record<string, { type?: string; description?: string }> })?.notCreated?.[subId];
+    if (notCreated) {
+      throw new Error(`MDN submission failed: ${notCreated.description || notCreated.type || 'unknown'}`);
+    }
+  }
+
   getBlobDownloadUrl(blobId: string, name?: string, type?: string): string {
     if (!this.downloadUrl) {
       throw new Error('Download URL not available. Please reconnect.');

lib/jmap/sieve-types.ts

@@ -13,14 +13,21 @@ export interface SieveCapabilities {
   externalLists: string[];
 }
 
-export type FilterConditionField = 'from' | 'to' | 'cc' | 'subject' | 'header' | 'size' | 'body';
+export type FilterConditionField =
+  | 'from' | 'to' | 'cc' | 'subject' | 'header' | 'size' | 'body'
+  | 'attachment';
 
 export type FilterComparator =
   | 'contains' | 'not_contains'
   | 'is' | 'not_is'
   | 'starts_with' | 'ends_with'
   | 'matches'
-  | 'greater_than' | 'less_than';
+  | 'greater_than' | 'less_than'
+  // For field === 'attachment':
+  //   has_any  → message has any attachment (Content-Disposition: attachment)
+  //   has_type → message has an attachment whose Content-Type matches `value`
+  //              (substring match, e.g. "application/pdf" or "image/")
+  | 'has_any' | 'has_type';
 
 export type FilterActionType =
   | 'move' | 'copy' | 'forward'
@@ -30,7 +37,16 @@ export type FilterActionType =
 export interface FilterCondition {
   field: FilterConditionField;
   comparator: FilterComparator;
-  value: string;
+  /**
+   * Match value. Use a string array for OR-within-condition semantics
+   * (e.g. `["@domain1.com", "@domain2.com"]` matches mail from either).
+   * Sieve emits the array as a list literal which the implementation
+   * treats as "matches any item". Use a plain string for single-value
+   * conditions; existing single-value rules continue to work unchanged.
+   *
+   * Not supported for: size (numeric), has_any (no value).
+   */
+  value: string | string[];
   headerName?: string;
 }
 

lib/mdn.ts

@@ -0,0 +1,154 @@
+// Builds an RFC 8098 Message Disposition Notification (MDN) as a raw RFC 5322
+// message string. JMAP/Stalwart has no native MDN support, so the client
+// constructs the multipart/report itself and sends it via
+// blob-upload -> Email/import -> EmailSubmission/set (see client.sendReadReceipt).
+//
+// The message has two parts:
+//   1. text/plain  — human-readable explanation (English, ASCII; rarely shown)
+//   2. message/disposition-notification — the machine-readable fields
+// The optional third part (original message/headers) is omitted; RFC 8098 §3.1
+// permits a two-part report.
+
+export interface MdnOptions {
+  /** Address that requested the receipt (Disposition-Notification-To) — the MDN recipient. */
+  to: string;
+  /** Our identity address (sender of the MDN). */
+  fromEmail: string;
+  /** Optional display name for the From header. */
+  fromName?: string;
+  /** Original Message-ID. JMAP may hand this back as a string[]
+   *  (header:Message-ID:asMessageIds), so accept both. */
+  originalMessageId?: string | string[];
+  /** Original Subject (used to build the MDN subject). */
+  originalSubject?: string;
+  /**
+   * The address the original message was delivered to (our address/alias).
+   * Used for Final-Recipient/Original-Recipient. Falls back to fromEmail.
+   */
+  originalRecipient?: string;
+  /** true => automatic-action (setting "always"); false => manual-action (user clicked send). */
+  automatic?: boolean;
+  /** Reporting-UA value, e.g. "mail.dornig.de; Bulwark Webmail". */
+  reportingUa?: string;
+  /** Localized full Subject line. Defaults to "Read: <originalSubject>". */
+  subject?: string;
+  /** Localized human-readable explanation (first report part). Defaults to English. */
+  humanText?: string;
+}
+
+const DAYS = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
+const MONTHS = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
+
+/** RFC 5322 date in UTC, e.g. "Thu, 28 May 2026 14:23:00 +0000". */
+function rfc5322Date(d: Date = new Date()): string {
+  const pad = (n: number) => String(n).padStart(2, "0");
+  return `${DAYS[d.getUTCDay()]}, ${pad(d.getUTCDate())} ${MONTHS[d.getUTCMonth()]} ${d.getUTCFullYear()} ` +
+    `${pad(d.getUTCHours())}:${pad(d.getUTCMinutes())}:${pad(d.getUTCSeconds())} +0000`;
+}
+
+/** UTF-8 string -> base64, without the deprecated unescape(). */
+function utf8ToBase64(value: string): string {
+  const bytes = new TextEncoder().encode(value);
+  let binary = "";
+  for (let i = 0; i < bytes.length; i++) binary += String.fromCharCode(bytes[i]);
+  return btoa(binary);
+}
+
+/** UTF-8 base64 body, wrapped at 76 chars per RFC 2045. */
+function base64Body(text: string): string {
+  return (utf8ToBase64(text).match(/.{1,76}/g) || []).join("\r\n");
+}
+
+/** RFC 2047 encoded-word for header values that contain non-ASCII characters. */
+function encodeHeaderWord(value: string): string {
+  // eslint-disable-next-line no-control-regex
+  if (!/[^\x00-\x7F]/.test(value)) return value;
+  return `=?UTF-8?B?${utf8ToBase64(value)}?=`;
+}
+
+function ensureAngles(messageId: string | string[] | undefined): string {
+  // JMAP often returns Message-ID as a string[] (header:...:asMessageIds), so
+  // normalize string | string[] | undefined down to a single bracketed id.
+  const raw = Array.isArray(messageId) ? messageId[0] : messageId;
+  if (typeof raw !== "string") return "";
+  const trimmed = raw.trim();
+  if (!trimmed) return "";
+  return trimmed.startsWith("<") ? trimmed : `<${trimmed}>`;
+}
+
+function randomToken(): string {
+  const rnd = Math.random().toString(36).slice(2);
+  return `${Date.now().toString(36)}.${rnd}`;
+}
+
+/**
+ * Build the raw RFC 5322 MDN message. Lines are CRLF-terminated as required
+ * by the MIME standard so the bytes import/transmit verbatim.
+ */
+export function buildMdnMessage(opts: MdnOptions): string {
+  const finalRecipient = opts.originalRecipient || opts.fromEmail;
+  const domain = (opts.fromEmail.split("@")[1] || "localhost").trim();
+  const messageId = `<mdn.${randomToken()}@${domain}>`;
+  const boundary = `----=_MDN_${randomToken()}`;
+  const origMsgId = ensureAngles(opts.originalMessageId); // normalized "<...>" or ""
+
+  const fromHeader = opts.fromName
+    ? `${encodeHeaderWord(opts.fromName)} <${opts.fromEmail}>`
+    : opts.fromEmail;
+
+  const subject = encodeHeaderWord(
+    opts.subject ?? `Read: ${opts.originalSubject || ""}`.trim()
+  );
+
+  const disposition = opts.automatic
+    ? "automatic-action/MDN-sent-automatically; displayed"
+    : "manual-action/MDN-sent-manually; displayed";
+
+  const reportingUa = opts.reportingUa || `${domain}; Bulwark Webmail`;
+
+  // Human-readable part. Caller passes a localized humanText; fall back to
+  // English. Encoded as UTF-8/base64 below so any language survives.
+  const humanText = opts.humanText ?? [
+    `This is a return receipt for the message you sent to ${finalRecipient}.`,
+    ``,
+    `Note: This receipt only acknowledges that the message was displayed on the`,
+    `recipient's computer. There is no guarantee that the recipient has read or`,
+    `understood the message contents.`,
+  ].join("\r\n");
+
+  // Machine-readable disposition-notification part (pure ASCII tokens).
+  const mdnFields = [
+    `Reporting-UA: ${reportingUa}`,
+    `Final-Recipient: rfc822;${finalRecipient}`,
+    ...(opts.originalRecipient ? [`Original-Recipient: rfc822;${opts.originalRecipient}`] : []),
+    ...(origMsgId ? [`Original-Message-ID: ${origMsgId}`] : []),
+    `Disposition: ${disposition}`,
+  ].join("\r\n");
+
+  return [
+    `Date: ${rfc5322Date()}`,
+    `From: ${fromHeader}`,
+    `To: ${opts.to}`,
+    `Subject: ${subject}`,
+    `Message-ID: ${messageId}`,
+    ...(origMsgId ? [`In-Reply-To: ${origMsgId}`] : []),
+    `MIME-Version: 1.0`,
+    `Content-Type: multipart/report; report-type=disposition-notification;`,
+    `\tboundary="${boundary}"`,
+    ``,
+    `--${boundary}`,
+    `Content-Type: text/plain; charset=utf-8`,
+    `Content-Transfer-Encoding: base64`,
+    ``,
+    base64Body(humanText),
+    ``,
+    `--${boundary}`,
+    `Content-Type: message/disposition-notification`,
+    `Content-Transfer-Encoding: 7bit`,
+    ``,
+    mdnFields,
+    ``,
+    `--${boundary}--`,
+    ``,
+  ].join("\r\n");
+}

lib/plugin-loader.ts

@@ -10,32 +10,25 @@ import {
   activateAllSandboxed,
   deactivateAllSandboxed,
   setSandboxStoreAccessor,
-  setSandboxLocale,
   setupSandboxAutoDisable,
 } from './plugin-sandbox/loader';
 import { all as allActive, get as getActive } from './plugin-sandbox/registry';
 
+// Re-export so the plugin store can keep the sandbox locale in step via this
+// facade, instead of importing lib/plugin-sandbox/loader directly (which would
+// also pull the hook buses into consumers' module graphs).
+export { setSandboxLocale } from './plugin-sandbox/loader';
+
 /**
- * Previously: re-published React/ReactDOM on `globalThis.__PLUGIN_EXTERNALS__`
- * so blob-imported plugin code could resolve `react`. With the sandbox model
- * plugins receive React injected as a function argument inside their iframe
- * runtime - there is nothing to expose on the host window.
- *
- * Kept as a no-op for callers that still invoke it during app bootstrap.
+ * Historically re-published React/ReactDOM on `globalThis` for the blob-import
+ * loader, and later also bootstrapped plugin locale sync. Both are obsolete:
+ * the sandbox injects React per-iframe, and locale sync now lives where plugin
+ * activation is orchestrated (stores/plugin-store -> initializePlugins, via
+ * setSandboxLocale). Kept as a no-op for the legacy activateAllPlugins()
+ * wrapper and its test.
  */
 export function exposePluginExternals(): void {
-  if (typeof window === 'undefined') return;
-  // Initialise the locale sync once. Importing the store lazily avoids the
-  // circular module graph we used to fight before the sandbox refactor.
-  void import('@/stores/locale-store').then(({ useLocaleStore }) => {
-    setSandboxLocale(useLocaleStore.getState().locale);
-    useLocaleStore.subscribe((state) => setSandboxLocale(state.locale));
-    // Mirror on a global so the slot-iframe component can read it at spawn.
-    (globalThis as unknown as { __APP_LOCALE__?: string }).__APP_LOCALE__ = useLocaleStore.getState().locale;
-    useLocaleStore.subscribe((state) => {
-      (globalThis as unknown as { __APP_LOCALE__?: string }).__APP_LOCALE__ = state.locale;
-    });
-  }).catch(() => { /* locale sync is best-effort */ });
+  /* no-op */
 }
 
 // ─── Store accessor (status updates) ──────────────────────────

lib/plugin-sandbox/host-api.ts

@@ -140,7 +140,7 @@ async function doHttpPost(plugin: InstalledPlugin, path: string, body: unknown):
     headers['Authorization'] = client.getAuthHeader();
     headers['X-JMAP-Username'] = client.getUsername();
   }
-  const res = await fetch(url.pathname + url.search, {
+  const res = await apiFetch(url.pathname + url.search, {
     method: 'POST',
     headers,
     body: JSON.stringify(body),

lib/plugin-sandbox/host-bridge.ts

@@ -10,6 +10,7 @@
 import type { InstalledPlugin, SlotName } from '../plugin-types';
 import { dispatchApiCall } from './host-api';
 import { SANDBOX_PATH } from './protocol';
+import { withBasePath } from '../browser-navigation';
 import type {
   SandboxToHost, HostToSandbox, InitMsg, InitPayload,
 } from './protocol';
@@ -143,7 +144,10 @@ export class SandboxInstance {
       this.iframe.style.width = '100%';
       this.iframe.style.height = '0px';
     }
-    this.iframe.src = SANDBOX_PATH;
+    // Prefix with the mount path so the sandbox route resolves under a
+    // subpath deployment (NEXT_PUBLIC_BASE_PATH=/webmail). A bare
+    // "/plugin-sandbox" would hit the origin root and 404, breaking plugins.
+    this.iframe.src = withBasePath(SANDBOX_PATH);
 
     this.listener = (ev) => this.onMessage(ev);
     window.addEventListener('message', this.listener);

lib/plugin-sandbox/loader.ts

@@ -41,11 +41,16 @@ export function setSandboxStoreAccessor(a: StoreAccessor): void { storeAccessor
 
 let currentLocale = 'en';
 export function setSandboxLocale(locale: string): void {
+  // Ignore empty/falsy values so a not-yet-seeded locale store can't clobber a
+  // good locale back to '' - the initial 'en' default stands until the real
+  // locale arrives via the store subscription.
+  if (!locale) return;
   currentLocale = locale;
-  // Push to all active background instances.
-  // Slot iframes inherit locale at spawn time; they're short-lived.
-  // (We don't import the registry here to avoid a circular import; the
-  //  PluginIframeSlot subscribes to locale changes on its own.)
+  // Background instances read `currentLocale` at load time; the slot-iframe
+  // component reads this global at spawn time (plugin-iframe-slot.tsx). Keep
+  // both in step from one place. Already-running instances are not re-pushed,
+  // so a locale switch only affects plugins/slots loaded afterwards.
+  (globalThis as unknown as { __APP_LOCALE__?: string }).__APP_LOCALE__ = locale;
 }
 
 // ─── Bundle fetch ─────────────────────────────────────────────

lib/plugin-sandbox/runtime.tsx

@@ -73,18 +73,26 @@ function uid(): string {
 
 // ─── Sandboxed API facade (calls flow to host via postMessage) ─
 
-function callApi(method: string, args: unknown[]): Promise<unknown> {
+const DEFAULT_API_TIMEOUT_MS = 30_000;
+
+function callApi(method: string, args: unknown[], timeoutMs: number = DEFAULT_API_TIMEOUT_MS): Promise<unknown> {
   const id = uid();
   return new Promise((resolve, reject) => {
     pendingApi.set(id, { resolve, reject });
     sendToHost({ type: 'api-request', id, method, args });
-    // Reject after 30s to prevent unbounded promise leaks if the host hangs.
-    setTimeout(() => {
-      const entry = pendingApi.get(id);
-      if (!entry) return;
-      pendingApi.delete(id);
-      entry.reject(new Error(`API call ${method} timed out after 30s`));
-    }, 30_000);
+    // Bounded so a hung host can't leak the promise forever. Interactive UI
+    // dialogs (ui.confirm/ui.alert) pass timeoutMs <= 0 to opt out: they wait
+    // for human input, the host always resolves them on confirm/cancel/close,
+    // and any still-pending call dies with the iframe on teardown - so there's
+    // nothing to leak, and a thinking user must not trip a 30s timeout.
+    if (timeoutMs > 0 && Number.isFinite(timeoutMs)) {
+      setTimeout(() => {
+        const entry = pendingApi.get(id);
+        if (!entry) return;
+        pendingApi.delete(id);
+        entry.reject(new Error(`API call ${method} timed out after ${Math.round(timeoutMs / 1000)}s`));
+      }, timeoutMs);
+    }
   });
 }
 
@@ -151,12 +159,13 @@ function buildPluginApi(manifest: PluginManifest) {
       warning: (m: string) => { void callApi('toast.warning', [m]); },
     },
     ui: {
-      /** Opens a host-rendered confirm dialog. Resolves to true on confirm, false otherwise. */
+      /** Opens a host-rendered confirm dialog. Resolves to true on confirm, false otherwise.
+       *  No timeout - it waits for the user's choice. */
       confirm: (opts: { title?: string; message?: string; confirmLabel?: string; cancelLabel?: string; danger?: boolean }) =>
-        callApi('ui.confirm', [opts]) as Promise<boolean>,
-      /** Opens a host-rendered alert (one button). Resolves once dismissed. */
+        callApi('ui.confirm', [opts], 0) as Promise<boolean>,
+      /** Opens a host-rendered alert (one button). Resolves once dismissed. No timeout. */
       alert: (opts: { title?: string; message?: string; confirmLabel?: string }) =>
-        callApi('ui.alert', [opts]) as Promise<void>,
+        callApi('ui.alert', [opts], 0) as Promise<void>,
       /** Opens an http/https URL in a new tab via host `window.open`. */
       openExternalUrl: (url: string, target?: string) =>
         callApi('ui.openExternalUrl', [url, target]) as Promise<void>,
@@ -173,6 +182,26 @@ function buildPluginApi(manifest: PluginManifest) {
       warn:  (...a: unknown[]) => console.warn(`[plugin:${manifest.id}]`, ...a),
       error: (...a: unknown[]) => console.error(`[plugin:${manifest.id}]`, ...a),
     },
+    // Localization for plugins. The host pushes the active locale (init +
+    // 'locale-change'); `t` resolves a key against the plugin's declared
+    // `locales` map (manifest.locales), falling back to English then the key
+    // itself, with optional {placeholder} interpolation.
+    i18n: {
+      get locale(): string {
+        return (globalThis as unknown as { __PLUGIN_LOCALE__?: string }).__PLUGIN_LOCALE__ || 'en';
+      },
+      t(key: string, vars?: Record<string, string | number>): string {
+        const loc = (globalThis as unknown as { __PLUGIN_LOCALE__?: string }).__PLUGIN_LOCALE__ || 'en';
+        const tables = manifest.locales || {};
+        let out = tables[loc]?.[key] ?? tables['en']?.[key] ?? key;
+        if (vars) {
+          for (const [k, v] of Object.entries(vars)) {
+            out = out.split('{' + k + '}').join(String(v));
+          }
+        }
+        return out;
+      },
+    },
   };
 }
 
@@ -344,6 +373,9 @@ async function handleInit(payload: InitPayload): Promise<void> {
   if (bootDone) return;
   bootDone = true;
   mode = payload.mode;
+  // Make the active locale available to plugin code (api.i18n) right away -
+  // not only after the first 'locale-change' push.
+  (globalThis as unknown as { __PLUGIN_LOCALE__?: string }).__PLUGIN_LOCALE__ = payload.locale;
   try {
     if (payload.mode === 'background') {
       await bootBackground(payload);

lib/quote-header.ts

@@ -10,6 +10,17 @@ import { formatDateTime } from "@/lib/utils";
 import { emailHooks } from "@/lib/plugin-hooks";
 import type { QuoteHeader, QuoteHeaderContext } from "@/lib/plugin-types";
 
+// Localized label set the caller passes in. Labels live on the client where
+// useTranslations is available; this module stays framework-agnostic.
+export interface QuoteHeaderLabels {
+  /** ICU-formatted reply line, e.g. "On {date}, {from} wrote:" with placeholders already substituted. */
+  formatReplyLine: (vars: { date: string; from: string }) => string;
+  forwardedSeparator: string;
+  fromLabel: string;
+  dateLabel: string;
+  subjectLabel: string;
+}
+
 interface BuildArgs {
   mode: "reply" | "replyAll" | "forward";
   email: {
@@ -24,10 +35,24 @@ interface BuildArgs {
   locale: string;
   timeFormat: "12h" | "24h";
   unknownLabel: string;
+  /**
+   * Localized labels. Optional for backward compatibility; falls back to
+   * English (matching the original hardcoded behaviour) when not supplied.
+   */
+  labels?: QuoteHeaderLabels;
 }
 
+const DEFAULT_LABELS: QuoteHeaderLabels = {
+  formatReplyLine: ({ date, from }) => `On ${date}, ${from} wrote:`,
+  forwardedSeparator: "---------- Forwarded message ----------",
+  fromLabel: "From",
+  dateLabel: "Date",
+  subjectLabel: "Subject",
+};
+
 function defaultHeader(args: BuildArgs): QuoteHeader {
   const { mode, email, timeFormat, unknownLabel } = args;
+  const labels = args.labels ?? DEFAULT_LABELS;
   const date = email.receivedAt
     ? formatDateTime(email.receivedAt, timeFormat, {
         weekday: "short",
@@ -38,16 +63,25 @@ function defaultHeader(args: BuildArgs): QuoteHeader {
     : "";
   const from = email.from?.[0];
   const fromStr = from ? `${from.name || from.email}` : unknownLabel;
+  // Forward header "From:" shows the full sender incl. address ("Name
+  // <email>"), like every mail client. The reply line keeps the bare name
+  // (reads more naturally in "On … wrote:").
+  const fromStrFull = from
+    ? (from.name && from.email && from.name !== from.email
+        ? `${from.name} <${from.email}>`
+        : (from.email || from.name || unknownLabel))
+    : unknownLabel;
   const subject = email.subject || "";
 
   if (mode === "forward") {
-    const text = `---------- Forwarded message ----------\nFrom: ${fromStr}\nDate: ${date}\nSubject: ${subject}\n`;
-    const html = `<div>---------- Forwarded message ----------<br>From: ${fromStr}<br>Date: ${date}<br>Subject: ${subject}<br><br></div>`;
+    const text = `${labels.forwardedSeparator}\n${labels.fromLabel}: ${fromStrFull}\n${labels.dateLabel}: ${date}\n${labels.subjectLabel}: ${subject}\n`;
+    const html = `<div>${labels.forwardedSeparator}<br>${labels.fromLabel}: ${fromStrFull}<br>${labels.dateLabel}: ${date}<br>${labels.subjectLabel}: ${subject}<br><br></div>`;
     return { html, text, wrapInBlockquote: false };
   }
 
-  const text = `On ${date}, ${fromStr} wrote:\n`;
-  const html = `<div>On ${date}, ${fromStr} wrote:<br></div>`;
+  const replyLine = labels.formatReplyLine({ date, from: fromStr });
+  const text = `${replyLine}\n`;
+  const html = `<div>${replyLine}<br></div>`;
   return { html, text, wrapInBlockquote: true };
 }
 

lib/sieve/generator.ts

@@ -12,42 +12,82 @@ function escapeString(value: string): string {
   return value.replace(/\\/g, '\\\\').replace(/"/g, '\\"');
 }
 
+// Normalise the condition value to a non-empty string array. Single-value
+// conditions stay one-element; arrays are filtered for empty strings.
+function toValueList(value: string | string[]): string[] {
+  const arr = Array.isArray(value) ? value : [value];
+  return arr.map((v) => (v ?? '').toString()).filter((v) => v.length > 0);
+}
+
+// Render one or many strings as a Sieve string-literal-or-list. Sieve treats
+// `header :contains "From" ["a", "b"]` as "any of a, b" (built-in OR within
+// the condition); the single-string form is emitted unchanged when len === 1
+// so existing scripts and tests stay byte-identical.
+function formatStringArg(values: string[], transform: (s: string) => string = (s) => s): string {
+  if (values.length === 1) {
+    return `"${escapeString(transform(values[0]))}"`;
+  }
+  return `[${values.map((v) => `"${escapeString(transform(v))}"`).join(', ')}]`;
+}
+
 function generateCondition(condition: FilterCondition): string {
   const { field, comparator, value } = condition;
 
   if (field === 'size') {
+    // Size is numeric, single value only.
+    const sizeValue = Array.isArray(value) ? value[0] : value;
     const op = comparator === 'greater_than' ? ':over' : ':under';
-    return `size ${op} ${value}`;
+    return `size ${op} ${sizeValue}`;
   }
 
+  const values = toValueList(value);
+
   if (field === 'body') {
     const matchType = comparator === 'is' ? ':is' : ':contains';
-    return `body ${matchType} "${escapeString(value)}"`;
+    return `body ${matchType} ${formatStringArg(values)}`;
+  }
+
+  if (field === 'attachment') {
+    // RFC 5703: :mime :anychild matches against headers of any MIME part.
+    // has_any tests Content-Disposition for "attachment"; has_type matches
+    // the file extension against the filename across BOTH Content-Disposition
+    // (filename= parameter) and Content-Type (name= parameter) - many older
+    // senders (Microsoft SMTPSVC, PrintToMail, etc.) put the filename only
+    // in Content-Type and leave Content-Disposition without a filename.
+    // RFC 5228 §5.7 allows a string-list for header names; the test passes
+    // if any listed header matches. Wildcard "*.<ext>*" catches quoted,
+    // unquoted, and RFC-2231-encoded forms alike since ".<ext>" appears as
+    // a literal substring in all of them.
+    // Multiple extensions become a Sieve value-list ["*.pdf*", "*.xml*"]
+    // = OR within the condition (any item matches → test passes).
+    if (comparator === 'has_any') {
+      return `header :mime :anychild :contains "Content-Disposition" "attachment"`;
+    }
+    const normalised = values.map((v) => v.replace(/^[.*]+/, '').trim()).filter(Boolean);
+    return `header :mime :anychild :matches ["Content-Disposition", "Content-Type"] ${formatStringArg(normalised, (ext) => `*.${ext}*`)}`;
   }
 
   const headerName = field === 'header'
     ? (condition.headerName || 'X-Unknown')
     : HEADER_MAP[field];
 
-  const escaped = escapeString(value);
-
   switch (comparator) {
     case 'contains':
-      return `header :contains "${headerName}" "${escaped}"`;
+      return `header :contains "${headerName}" ${formatStringArg(values)}`;
     case 'not_contains':
-      return `not header :contains "${headerName}" "${escaped}"`;
+      return `not header :contains "${headerName}" ${formatStringArg(values)}`;
     case 'is':
-      return `header :is "${headerName}" "${escaped}"`;
+      return `header :is "${headerName}" ${formatStringArg(values)}`;
     case 'not_is':
-      return `not header :is "${headerName}" "${escaped}"`;
+      return `not header :is "${headerName}" ${formatStringArg(values)}`;
     case 'starts_with':
-      return `header :matches "${headerName}" "${escaped}*"`;
+      return `header :matches "${headerName}" ${formatStringArg(values, (v) => `${v}*`)}`;
     case 'ends_with':
-      return `header :matches "${headerName}" "*${escaped}"`;
+      return `header :matches "${headerName}" ${formatStringArg(values, (v) => `*${v}`)}`;
     case 'matches':
-      return `header :matches "${headerName}" "${escaped}"`;
+      return `header :matches "${headerName}" ${formatStringArg(values)}`;
     default:
-      return `header :contains "${headerName}" "${escaped}"`;
+      return `header :contains "${headerName}" ${formatStringArg(values)}`;
   }
 }
 
@@ -89,6 +129,7 @@ function computeRequires(rules: FilterRule[], vacation?: VacationSieveConfig): s
   for (const rule of enabledRules) {
     for (const condition of rule.conditions) {
       if (condition.field === 'body') extensions.add('body');
+      if (condition.field === 'attachment') extensions.add('mime');
     }
     for (const action of rule.actions) {
       switch (action.type) {

lib/sieve/parser.ts

@@ -36,7 +36,11 @@ const FIELD_FROM_HEADER: Record<string, FilterConditionField> = {
 function isValidCondition(c: unknown): boolean {
   if (!c || typeof c !== 'object') return false;
   const cond = c as Record<string, unknown>;
-  return typeof cond.field === 'string' && typeof cond.comparator === 'string' && typeof cond.value === 'string';
+  if (typeof cond.field !== 'string' || typeof cond.comparator !== 'string') return false;
+  // value may be a string OR a non-empty array of strings (Patch 11
+  // multi-value semantics). Accept both.
+  if (typeof cond.value === 'string') return true;
+  return Array.isArray(cond.value) && cond.value.every((v) => typeof v === 'string');
 }
 
 function isValidAction(a: unknown): boolean {
@@ -334,43 +338,150 @@ function parseAtom(raw: string): FilterCondition | null {
     }
   }
 
-  let m = /^header\s+:(contains|is|matches)\s+"((?:[^"\\]|\\.)*)"\s+"((?:[^"\\]|\\.)*)"$/.exec(s);
+  // Parse the value-tail of a header/body test: either a single quoted
+  // string or a Sieve list literal ["a", "b", ...]. Returns the unwrapped
+  // value(s), preserving the array shape when present so the caller can
+  // detect multi-value conditions.
+  const parseValueTail = (raw: string): string | string[] | null => {
+    const trimmed = raw.trim();
+    // List form
+    if (trimmed.startsWith('[') && trimmed.endsWith(']')) {
+      const inner = trimmed.slice(1, -1);
+      const items: string[] = [];
+      const re = /"((?:[^"\\]|\\.)*)"/g;
+      let mm: RegExpExecArray | null;
+      let cursor = 0;
+      while ((mm = re.exec(inner)) !== null) {
+        // Ensure only whitespace and commas appear between items
+        if (inner.slice(cursor, mm.index).replace(/[\s,]/g, '') !== '') return null;
+        items.push(unescapeSieveString(mm[1]));
+        cursor = mm.index + mm[0].length;
+      }
+      if (inner.slice(cursor).replace(/[\s,]/g, '') !== '') return null;
+      if (items.length === 0) return null;
+      return items.length === 1 ? items[0] : items;
+    }
+    // Single string form
+    const single = /^"((?:[^"\\]|\\.)*)"$/.exec(trimmed);
+    if (single) return unescapeSieveString(single[1]);
+    return null;
+  };
+
+  // Classify a :matches value (or values) into starts_with / ends_with /
+  // matches by inspecting wildcard positions. For multi-value, all items
+  // must share the same shape; otherwise we fall back to 'matches' and
+  // keep the wildcards verbatim.
+  const classifyMatches = (
+    values: string | string[],
+  ): { comparator: 'starts_with' | 'ends_with' | 'matches'; stripped: string | string[] } => {
+    const arr = Array.isArray(values) ? values : [values];
+    const isTrailing = (v: string) => {
+      const stars = [...v].filter((c) => c === '*').length;
+      return stars === 1 && v.endsWith('*');
+    };
+    const isLeading = (v: string) => {
+      const stars = [...v].filter((c) => c === '*').length;
+      return stars === 1 && v.startsWith('*');
+    };
+    if (arr.every(isTrailing)) {
+      const stripped = arr.map((v) => v.slice(0, -1));
+      return { comparator: 'starts_with', stripped: Array.isArray(values) ? stripped : stripped[0] };
+    }
+    if (arr.every(isLeading)) {
+      const stripped = arr.map((v) => v.slice(1));
+      return { comparator: 'ends_with', stripped: Array.isArray(values) ? stripped : stripped[0] };
+    }
+    return { comparator: 'matches', stripped: values };
+  };
+
+  // Match attachment-aware :mime :anychild tests before the generic header
+  // pattern - emitted by our own generator for field === 'attachment'.
+  // has_any: ":contains Content-Disposition attachment"
+  let m = /^header\s+:mime\s+:anychild\s+:contains\s+"Content-Disposition"\s+"attachment"$/.exec(s);
   if (m) {
-    const [, tag, headerName, rawValue] = m;
-    const value = unescapeSieveString(rawValue);
+    return { field: 'attachment', comparator: 'has_any', value: '' };
+  }
+  // has_type: ":matches <headers> <value-tail>"
+  // - Current emit form uses a header-list ["Content-Disposition", "Content-Type"]
+  //   to catch senders who put the filename only in Content-Type's name= param
+  //   (Microsoft SMTPSVC, PrintToMail.net, etc.).
+  // - Legacy emit form used a single "Content-Disposition" header - still
+  //   recognised here so rules saved before the fix remain editable.
+  // Each value item must be a "*.<ext>*" wildcard pattern.
+  const tryHasType = (rawHeaders: string, rawValue: string): FilterCondition | null => {
+    // Header part: accept either a single quoted string or a 2-element list
+    // containing exactly Content-Disposition + Content-Type (in any order).
+    const single = /^"Content-Disposition"$/.exec(rawHeaders.trim());
+    const listForm = /^\[\s*((?:"(?:[^"\\]|\\.)*"\s*,?\s*)+)\]$/.exec(rawHeaders.trim());
+    let headersOk = false;
+    if (single) {
+      headersOk = true;
+    } else if (listForm) {
+      const inner = listForm[1];
+      const items: string[] = [];
+      const re = /"((?:[^"\\]|\\.)*)"/g;
+      let mm: RegExpExecArray | null;
+      while ((mm = re.exec(inner)) !== null) items.push(unescapeSieveString(mm[1]));
+      const expected = new Set(['Content-Disposition', 'Content-Type']);
+      const got = new Set(items);
+      headersOk =
+        items.length === expected.size &&
+        [...expected].every((h) => got.has(h));
+    }
+    if (!headersOk) return null;
+    const tail = parseValueTail(rawValue);
+    if (tail === null) return null;
+    const arr = Array.isArray(tail) ? tail : [tail];
+    const exts: string[] = [];
+    for (const item of arr) {
+      const em = /^\*\.((?:[^*\\]|\\.)+)\*$/.exec(item);
+      if (!em) return null;
+      exts.push(unescapeSieveString(em[1]));
+    }
+    return { field: 'attachment', comparator: 'has_type', value: exts.length === 1 ? exts[0] : exts };
+  };
+  m = /^header\s+:mime\s+:anychild\s+:matches\s+(\[[\s\S]+?\]|"[^"]+")\s+([\s\S]+)$/.exec(s);
+  if (m) {
+    const result = tryHasType(m[1], m[2]);
+    if (result) return result;
+  }
+  // Unknown :mime :anychild pattern (e.g. from external scripts) - bail to
+  // opaque rendering so we don't silently misrepresent the script.
+  if (/^header\s+:mime\s+:anychild\b/.test(s)) {
+    return null;
+  }
+
+  m = /^header\s+:(contains|is|matches)\s+"((?:[^"\\]|\\.)*)"\s+([\s\S]+)$/.exec(s);
+  if (m) {
+    const [, tag, headerName, rawTail] = m;
+    const value = parseValueTail(rawTail);
+    if (value === null) return null;
     const { field, headerName: customHeaderName } = normalizeHeaderName(unescapeSieveString(headerName));
 
     let comparator: FilterComparator;
+    let finalValue: string | string[];
     if (tag === 'contains') {
       comparator = negated ? 'not_contains' : 'contains';
+      finalValue = value;
     } else if (tag === 'is') {
       comparator = negated ? 'not_is' : 'is';
+      finalValue = value;
     } else {
-      // :matches - distinguish starts_with / ends_with / matches
-      const starPositions = [...value].reduce<number[]>((acc, ch, idx) => (ch === '*' ? [...acc, idx] : acc), []);
-      if (starPositions.length === 1 && starPositions[0] === value.length - 1) {
-        comparator = 'starts_with';
-        const cond: FilterCondition = { field, comparator, value: value.slice(0, -1) };
-        if (customHeaderName !== undefined) cond.headerName = customHeaderName;
-        return cond;
-      }
-      if (starPositions.length === 1 && starPositions[0] === 0) {
-        comparator = 'ends_with';
-        const cond: FilterCondition = { field, comparator, value: value.slice(1) };
-        if (customHeaderName !== undefined) cond.headerName = customHeaderName;
-        return cond;
-      }
-      comparator = 'matches';
+      const classified = classifyMatches(value);
+      comparator = classified.comparator;
+      finalValue = classified.stripped;
     }
 
-    const cond: FilterCondition = { field, comparator, value };
+    const cond: FilterCondition = { field, comparator, value: finalValue };
     if (customHeaderName !== undefined) cond.headerName = customHeaderName;
     return cond;
   }
 
-  m = /^body\s+:(contains|is)\s+"((?:[^"\\]|\\.)*)"$/.exec(s);
+  m = /^body\s+:(contains|is)\s+([\s\S]+)$/.exec(s);
   if (m) {
-    return { field: 'body', comparator: m[1] === 'is' ? 'is' : 'contains', value: unescapeSieveString(m[2]) };
+    const value = parseValueTail(m[2]);
+    if (value === null) return null;
+    return { field: 'body', comparator: m[1] === 'is' ? 'is' : 'contains', value };
   }
 
   m = /^size\s+:(over|under)\s+(\d+)$/.exec(s);

lib/signature-utils.ts

@@ -124,6 +124,35 @@ export function appendPlainTextSignature(
   return `${body}${sep}${plainTextSignature}`;
 }
 
+/**
+ * Append a signature to an HTML body, preserving rich formatting. Used by the
+ * quick-reply path so an HTML signature keeps its markup instead of being
+ * flattened to plain text. Mirrors the composer's send-time signature block
+ * (`buildSignatureHtml` in email-composer.tsx).
+ */
+export function appendHtmlSignature(
+  htmlBody: string,
+  signature?: SignatureSource | null,
+  options: { separator?: boolean } = {},
+): string {
+  const sep = options.separator === false ? '<br><br>' : '<br><br>-- <br>';
+
+  if (signature?.htmlSignature?.trim()) {
+    return `${htmlBody}${sep}${sanitizeSignatureHtml(signature.htmlSignature)}`;
+  }
+
+  if (signature?.textSignature?.trim()) {
+    const escaped = signature.textSignature
+      .replace(/&/g, '&amp;')
+      .replace(/</g, '&lt;')
+      .replace(/>/g, '&gt;')
+      .replace(/\n/g, '<br>');
+    return `${htmlBody}${sep}${escaped}`;
+  }
+
+  return htmlBody;
+}
+
 export function hasMeaningfulHtmlBody(html: string): boolean {
   if (!html.trim()) return false;
 

lib/subject-prefix.ts

@@ -0,0 +1,119 @@
+// Reply / forward subject prefix handling.
+//
+// Real-world email subjects accumulate prefixes across clients and languages:
+// "Re: AW: WG: Fwd: Re: foo". The deduplication regex needs to know ALL
+// commonly-used reply/forward markers - not just the current locale's, since
+// inbound messages may come from any locale. Failing to strip a foreign-locale
+// prefix means the user's locale prefix gets *added on top* and the subject
+// chain keeps growing.
+//
+// Sources: de-facto conventions in Outlook / Thunderbird / Apple Mail per
+// language. Includes a handful of legacy short-forms (R:, Fw:) that some
+// mobile clients still emit.
+
+const REPLY_TOKENS = [
+  "Re",      // English, Italian, French (also generic ISO)
+  "RE",      // Outlook variant
+  "AW",      // German (Antwort)
+  "Antw",    // German verbose
+  "Sv",      // Danish / Swedish / Norwegian (Svar)
+  "Yn",      // Turkish (Yanit)
+  "Yanit",   // Turkish verbose
+  "Odp",     // Polish (Odpowiedz)
+  "Ответ",   // Russian
+  "Resp",    // Spanish/Portuguese variant
+  "Vá",      // Hungarian
+  "回复",    // Chinese
+  "回覆",    // Chinese traditional
+  "답장",    // Korean
+  // NB: deliberately no bare "R" token — a single letter would strip the first
+  // word of legitimate subjects like "R: budget 2024". The full "Re" covers
+  // the common Italian/English case anyway.
+];
+
+const FORWARD_TOKENS = [
+  "Fwd",     // English standard
+  "Fw",      // English short / Polish / German short
+  "WG",      // German (Weitergeleitet)
+  "Tr",      // French (Transfert)
+  "Vs",      // Danish (Videresend)
+  "Enc",     // Portuguese (Encaminhar)
+  "ENC",     // Portuguese caps
+  "Rv",      // Spanish (Reenviar)
+  "RV",      // Spanish caps
+  "Rvf",     // Spanish variant
+  "Inol",    // Italian (Inoltro)
+  // NB: deliberately no bare "I" token — see the REPLY_TOKENS note above.
+  "PD",      // Polish (Przekazane Dalej)
+  "PR",      // Czech (Preposlat)
+  "İlt",     // Turkish (Ilet)
+  "Ilt",     // Turkish ASCII
+  "Пересл",  // Russian (Peresylka)
+  "Пер",     // Russian short
+  "转发",    // Chinese
+  "轉寄",    // Chinese traditional
+  "전달",    // Korean
+];
+
+// Match a single prefix token + optional [N] counter (Outlook) or *N (Eudora)
+// + colon + whitespace. Case-insensitive. The non-capturing groups keep the
+// regex composable for stripping multiple prefixes in a row.
+function buildPrefixRegex(tokens: string[]): RegExp {
+  // Escape regex specials in tokens (none currently, but be defensive)
+  const escaped = tokens.map((t) => t.replace(/[.*+?^${}()|[\]\\]/g, "\\$&"));
+  // Sort by length DESC so longer tokens (e.g. "Пересл") win over their
+  // shorter prefixes (e.g. "Пер") during alternation matching.
+  escaped.sort((a, b) => b.length - a.length);
+  return new RegExp(
+    `^\\s*(?:${escaped.join("|")})(?:\\[\\d+\\]|\\*\\d*)?\\s*:\\s*`,
+    "i",
+  );
+}
+
+const ANY_PREFIX_RE = buildPrefixRegex([...REPLY_TOKENS, ...FORWARD_TOKENS]);
+
+/**
+ * Strip any leading sequence of reply/forward prefixes (across languages) from
+ * a subject line. Idempotent and safe for empty input.
+ *
+ * Examples:
+ *   stripSubjectPrefixes("Re: AW: WG: foo")        === "foo"
+ *   stripSubjectPrefixes("Re[2]: foo")             === "foo"
+ *   stripSubjectPrefixes("RE: Re: foo")            === "foo"
+ *   stripSubjectPrefixes("foo")                    === "foo"
+ *   stripSubjectPrefixes("")                       === ""
+ */
+export function stripSubjectPrefixes(subject: string | undefined | null): string {
+  if (!subject) return "";
+  let s = subject;
+  // Bounded loop: in practice you never see more than ~10 prefixes; the bound
+  // protects against pathological input. Each iteration must consume input.
+  for (let i = 0; i < 20; i++) {
+    const next = s.replace(ANY_PREFIX_RE, "");
+    if (next === s) break;
+    s = next;
+  }
+  return s;
+}
+
+/**
+ * Build a reply subject with the given locale-aware prefix. Strips any
+ * pre-existing prefixes (in any language) first so chains don't accumulate.
+ *
+ *   buildReplySubject("AW: WG: foo", "Re:")   === "Re: foo"
+ *   buildReplySubject("foo", "AW:")           === "AW: foo"
+ *   buildReplySubject("", "AW:")              === "AW:"
+ */
+export function buildReplySubject(subject: string | undefined | null, prefix: string): string {
+  const stripped = stripSubjectPrefixes(subject);
+  return stripped ? `${prefix} ${stripped}` : prefix;
+}
+
+/**
+ * Build a forward subject. Same logic as buildReplySubject but conceptually
+ * separate for clarity at the call site.
+ */
+export function buildForwardSubject(subject: string | undefined | null, prefix: string): string {
+  const stripped = stripSubjectPrefixes(subject);
+  return stripped ? `${prefix} ${stripped}` : prefix;
+}

locales/cs/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "Zadejte nové datum/čas, např. 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "Odesílatel žádá o potvrzení o přečtení:",
+      "send": "Odeslat potvrzení",
+      "ignore": "Ignorovat",
+      "sent": "Potvrzení o přečtení odesláno.",
+      "send_failed": "Potvrzení o přečtení se nepodařilo odeslat",
+      "mdn_subject": "Přečteno: {subject}",
+      "mdn_body": "Toto je potvrzení o přečtení zprávy, kterou jste odeslali na adresu {recipient}.\n\nPoznámka: Toto potvrzení pouze potvrzuje, že zpráva byla zobrazena na počítači příjemce. Nezaručuje, že příjemce obsah přečetl nebo mu porozuměl."
+    },
     "no_email_selected": "Není vybrána žádná zpráva",
     "no_email_description": "Vyberte zprávu ze seznamu pro její zobrazení",
     "no_conversation_selected": "Není vybrána žádná konverzace",
@@ -538,6 +547,8 @@
     "undo_send": "Vrátit odeslání"
   },
   "email_composer": {
+    "read_receipt_on": "Vyžádáno potvrzení o přečtení (kliknutím vypnete)",
+    "read_receipt_off": "Vyžádat potvrzení o přečtení",
     "new_message": "Nová zpráva",
     "reply": "Odpovědět",
     "reply_all": "Odpovědět všem",
@@ -554,8 +565,8 @@
     "send": "Odeslat",
     "cancel": "Zrušit",
     "attach": "Připojit",
-    "attach_photos": "Fotky a videa",
-    "attach_files": "Soubory",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "Zahodit",
     "discard_draft_title": "Zahodit koncept?",
     "discard_draft_confirm": "Máte neuložené změny. Chcete tento koncept zahodit?",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "Naplánované odeslání není pro tento účet podporováno.",
     "schedule_send_cleanup_warning": "Naplánované odeslání bylo vytvořeno, ale vyčištění konceptu selhalo.",
     "send_delay_unsupported": "Prodleva odeslání není pro tento účet podporována.",
-    "send_delay_unsupported_confirm": "Tento účet nepodporuje prodlevu odeslání. Odeslat ihned?",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "Tento účet nepodporuje prodlevu odeslání. Odeslat ihned?"
   },
   "confirm_dialog": {
     "confirm": "Potvrdit",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "Standardně vyžadovat potvrzení o přečtení",
+        "description": "Při psaní nové zprávy předem zapnout žádost o potvrzení o přečtení."
+      },
+      "read_receipt_response": {
+        "label": "Reagovat na žádosti o potvrzení o přečtení",
+        "description": "Co dělat, když příchozí zpráva žádá o potvrzení o přečtení.",
+        "ask": "Vždy se zeptat",
+        "always": "Vždy odeslat",
+        "never": "Nikdy neodesílat"
+      },
       "title": "Chování e-mailu",
       "description": "Nakonfigurujte způsob zpracování e-mailů",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "Poznámky",
       "title": "Složky",
       "description": "Správa složek pošty a přiřazení standardních rolí",
       "folder_list": "Vaše složky",
@@ -1625,7 +1646,10 @@
       "actions": "Akce",
       "add_action": "Přidat akci",
       "stop_processing": "Zastavit zpracování dalších pravidel",
+      "attachment_type_placeholder": "např. pdf, doc, jpg",
+      "value_placeholder_multi": "Hodnota (více oddělených čárkami)",
       "condition_fields": {
+        "attachment": "Příloha",
         "from": "Od",
         "to": "Komu",
         "cc": "Kopie",
@@ -1635,6 +1659,8 @@
         "body": "Tělo zprávy"
       },
       "comparators": {
+        "has_any": "je přítomna",
+        "has_type": "typu",
         "contains": "obsahuje",
         "not_contains": "neobsahuje",
         "is": "je přesně",
@@ -3048,5 +3074,20 @@
       "manager": "Správce",
       "custom": "Vlastní"
     }
+  },
+  "quote_header": {
+    "reply_line": "Dne {date} napsal(a) {from}:",
+    "forwarded_separator": "---------- Přeposlaná zpráva ----------",
+    "from_label": "Od",
+    "date_label": "Datum",
+    "subject_label": "Předmět"
+  },
+  "pwa_install": {
+    "title": "Nainstalovat {appName}",
+    "description": "Nainstalujte si naši aplikaci pro rychlý přístup a offline podporu.",
+    "not_now": "Teď ne",
+    "install": "Nainstalovat",
+    "dont_remind": "Už mi to nepřipomínat",
+    "dismiss_aria": "Zavřít výzvu k instalaci"
   }
 }

locales/da/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "Indtast en ny dato/tid, f.eks. 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "Afsenderen anmoder om en læsekvittering:",
+      "send": "Send kvittering",
+      "ignore": "Ignorér",
+      "sent": "Læsekvittering sendt.",
+      "send_failed": "Læsekvittering kunne ikke sendes",
+      "mdn_subject": "Læst: {subject}",
+      "mdn_body": "Dette er en læsekvittering for den besked, du sendte til {recipient}.\n\nBemærk: Denne kvittering bekræfter kun, at beskeden blev vist på modtagerens computer. Der er ingen garanti for, at modtageren har læst eller forstået indholdet."
+    },
     "no_email_selected": "Ingen e-mail valgt",
     "no_email_description": "Vælg en e-mail fra listen for at se den her",
     "no_conversation_selected": "Ingen samtale valgt",
@@ -538,6 +547,8 @@
     "undo_send": "Fortryd afsendelse"
   },
   "email_composer": {
+    "read_receipt_on": "Læsekvittering anmodet (klik for at deaktivere)",
+    "read_receipt_off": "Anmod om læsekvittering",
     "new_message": "Ny besked",
     "reply": "Svar",
     "reply_all": "Svar alle",
@@ -1000,6 +1011,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "Anmod om læsekvittering som standard",
+        "description": "Aktivér anmodningen om læsekvittering på forhånd, når du skriver en ny besked."
+      },
+      "read_receipt_response": {
+        "label": "Svar på anmodninger om læsekvittering",
+        "description": "Hvad der skal ske, når en indgående besked beder om en læsekvittering.",
+        "ask": "Spørg hver gang",
+        "always": "Send altid",
+        "never": "Send aldrig"
+      },
       "title": "E-mail-adfærd",
       "description": "Konfigurér hvordan e-mails håndteres",
       "mark_read": {
@@ -1424,6 +1446,7 @@
       }
     },
     "folders": {
+      "role_memos": "Noter",
       "title": "Mapper",
       "description": "Administrér dine e-mail-mapper og tildel standardroller",
       "folder_list": "Dine mapper",
@@ -1626,7 +1649,10 @@
       "actions": "Handlinger",
       "add_action": "Tilføj handling",
       "stop_processing": "Stop behandling af efterfølgende regler",
+      "attachment_type_placeholder": "f.eks. pdf, doc, jpg",
+      "value_placeholder_multi": "Værdi (flere adskilt med komma)",
       "condition_fields": {
+        "attachment": "Vedhæftet fil",
         "from": "Fra",
         "to": "Til",
         "cc": "Cc",
@@ -1636,6 +1662,8 @@
         "body": "Brødtekst"
       },
       "comparators": {
+        "has_any": "er til stede",
+        "has_type": "af typen",
         "contains": "indeholder",
         "not_contains": "indeholder ikke",
         "is": "er præcis",
@@ -3046,5 +3074,20 @@
   },
   "unified_mailbox": {
     "search_unavailable": "Søgning er ikke tilgængelig i den samlede visning"
+  },
+  "quote_header": {
+    "reply_line": "Den {date} skrev {from}:",
+    "forwarded_separator": "---------- Videresendt besked ----------",
+    "from_label": "Fra",
+    "date_label": "Dato",
+    "subject_label": "Emne"
+  },
+  "pwa_install": {
+    "title": "Installer {appName}",
+    "description": "Installer vores app for hurtig adgang og offline-understøttelse.",
+    "not_now": "Ikke nu",
+    "install": "Installer",
+    "dont_remind": "Påmind mig ikke igen",
+    "dismiss_aria": "Afvis installationsprompt"
   }
 }

locales/de/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "Neues Datum/Uhrzeit eingeben, z. B. 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "Der Absender bittet um eine Lesebestätigung:",
+      "send": "Bestätigung senden",
+      "ignore": "Ignorieren",
+      "sent": "Lesebestätigung gesendet.",
+      "send_failed": "Lesebestätigung konnte nicht gesendet werden",
+      "mdn_subject": "Gelesen: {subject}",
+      "mdn_body": "Dies ist eine Lesebestätigung für die Nachricht, die Sie an {recipient} gesendet haben.\n\nHinweis: Diese Bestätigung bestätigt lediglich, dass die Nachricht auf dem Computer des Empfängers angezeigt wurde. Es gibt keine Garantie, dass der Empfänger den Inhalt gelesen oder verstanden hat."
+    },
     "no_email_selected": "Keine E-Mail ausgewählt",
     "no_email_description": "Wählen Sie eine E-Mail aus der Liste aus, um sie hier anzuzeigen",
     "no_conversation_selected": "Keine Unterhaltung ausgewählt",
@@ -538,6 +547,8 @@
     "undo_send": "Senden rückgängig"
   },
   "email_composer": {
+    "read_receipt_on": "Lesebestätigung angefordert (klicken zum Deaktivieren)",
+    "read_receipt_off": "Lesebestätigung anfordern",
     "new_message": "Neue Nachricht",
     "reply": "Antworten",
     "reply_all": "Allen antworten",
@@ -554,8 +565,8 @@
     "send": "Senden",
     "cancel": "Abbrechen",
     "attach": "Anhängen",
-    "attach_photos": "Fotos & Videos",
-    "attach_files": "Dateien",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "Verwerfen",
     "discard_draft_title": "Entwurf verwerfen?",
     "discard_draft_confirm": "Sie haben ungespeicherte Änderungen. Möchten Sie diesen Entwurf verwerfen?",
@@ -571,8 +582,8 @@
     "subject_label": "Betreff:",
     "file_size_kb": "KB",
     "prefix": {
-      "forward": "Fwd:",
-      "reply": "Re:"
+      "forward": "WG:",
+      "reply": "AW:"
     },
     "no_subject": "(Kein Betreff)",
     "unknown_sender": "Unbekannt",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "Geplantes Senden wird für dieses Konto nicht unterstützt.",
     "schedule_send_cleanup_warning": "Geplantes Senden wurde erstellt, aber das Bereinigen des Entwurfs ist fehlgeschlagen.",
     "send_delay_unsupported": "Sendeverzögerung wird für dieses Konto nicht unterstützt.",
-    "send_delay_unsupported_confirm": "Dieses Konto unterstützt keine Sendeverzögerung. Stattdessen sofort senden?",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "Dieses Konto unterstützt keine Sendeverzögerung. Stattdessen sofort senden?"
   },
   "confirm_dialog": {
     "confirm": "Bestätigen",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "Lesebestätigung standardmäßig anfordern",
+        "description": "Beim Verfassen einer neuen Nachricht die Anforderung einer Lesebestätigung vorab aktivieren."
+      },
+      "read_receipt_response": {
+        "label": "Auf Lesebestätigungs-Anfragen reagieren",
+        "description": "Verhalten, wenn eine eingehende Nachricht um eine Lesebestätigung bittet.",
+        "ask": "Jedes Mal fragen",
+        "always": "Immer senden",
+        "never": "Nie senden"
+      },
       "title": "E-Mail-Verhalten",
       "description": "Konfigurieren Sie, wie E-Mails verarbeitet werden",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "Notizen",
       "title": "Ordner",
       "description": "Verwalten Sie Ihre E-Mail-Ordner und weisen Sie Standardrollen zu",
       "folder_list": "Ihre Ordner",
@@ -1625,7 +1646,10 @@
       "actions": "Aktionen",
       "add_action": "Aktion hinzufügen",
       "stop_processing": "Verarbeitung nachfolgender Regeln stoppen",
+      "attachment_type_placeholder": "z.B. pdf, doc, jpg",
+      "value_placeholder_multi": "Wert (mehrere mit Komma trennen)",
       "condition_fields": {
+        "attachment": "Anhang",
         "from": "Von",
         "to": "An",
         "cc": "Cc",
@@ -1635,6 +1659,8 @@
         "body": "Nachrichtentext"
       },
       "comparators": {
+        "has_any": "vorhanden",
+        "has_type": "vom Typ",
         "contains": "enthält",
         "not_contains": "enthält nicht",
         "is": "ist genau",
@@ -3048,5 +3074,20 @@
       "manager": "Verwalten",
       "custom": "Benutzerdefiniert"
     }
+  },
+  "quote_header": {
+    "reply_line": "Am {date} schrieb {from}:",
+    "forwarded_separator": "---------- Weitergeleitete Nachricht ----------",
+    "from_label": "Von",
+    "date_label": "Datum",
+    "subject_label": "Betreff"
+  },
+  "pwa_install": {
+    "title": "{appName} installieren",
+    "description": "Installiere unsere App für schnellen Zugriff und Offline-Unterstützung.",
+    "not_now": "Nicht jetzt",
+    "install": "Installieren",
+    "dont_remind": "Nicht mehr erinnern",
+    "dismiss_aria": "Installationshinweis schließen"
   }
 }

locales/en/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "Enter a new date/time, e.g. 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "The sender requested a read receipt:",
+      "send": "Send receipt",
+      "ignore": "Ignore",
+      "sent": "Read receipt sent.",
+      "send_failed": "Read receipt could not be sent",
+      "mdn_subject": "Read: {subject}",
+      "mdn_body": "This is a return receipt for the message you sent to {recipient}.\n\nNote: This receipt only acknowledges that the message was displayed on the recipient''s computer. There is no guarantee that the recipient has read or understood the message contents."
+    },
     "no_email_selected": "No email selected",
     "no_email_description": "Select an email from the list to view it here",
     "no_conversation_selected": "No conversation selected",
@@ -538,6 +547,8 @@
     "undo_send": "Undo send"
   },
   "email_composer": {
+    "read_receipt_on": "Read receipt requested (click to disable)",
+    "read_receipt_off": "Request a read receipt",
     "new_message": "New Message",
     "reply": "Reply",
     "reply_all": "Reply All",
@@ -1000,6 +1011,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "Request read receipts by default",
+        "description": "Pre-enable the read-receipt request when composing a new message."
+      },
+      "read_receipt_response": {
+        "label": "Respond to read-receipt requests",
+        "description": "What to do when an incoming message asks for a read receipt.",
+        "ask": "Ask each time",
+        "always": "Always send",
+        "never": "Never send"
+      },
       "title": "Email Behavior",
       "description": "Configure how emails are handled",
       "mark_read": {
@@ -1424,6 +1446,7 @@
       }
     },
     "folders": {
+      "role_memos": "Notes",
       "title": "Folders",
       "description": "Manage your email folders and assign standard roles",
       "folder_list": "Your Folders",
@@ -1626,7 +1649,10 @@
       "actions": "Actions",
       "add_action": "Add Action",
       "stop_processing": "Stop processing subsequent rules",
+      "attachment_type_placeholder": "e.g. pdf, doc, jpg",
+      "value_placeholder_multi": "Value (multiple separated by commas)",
       "condition_fields": {
+        "attachment": "Attachment",
         "from": "From",
         "to": "To",
         "cc": "Cc",
@@ -1636,6 +1662,8 @@
         "body": "Body"
       },
       "comparators": {
+        "has_any": "is present",
+        "has_type": "of type",
         "contains": "contains",
         "not_contains": "does not contain",
         "is": "is exactly",
@@ -3046,5 +3074,20 @@
   },
   "unified_mailbox": {
     "search_unavailable": "Search is not available in the unified view"
+  },
+  "quote_header": {
+    "reply_line": "On {date}, {from} wrote:",
+    "forwarded_separator": "---------- Forwarded message ----------",
+    "from_label": "From",
+    "date_label": "Date",
+    "subject_label": "Subject"
+  },
+  "pwa_install": {
+    "title": "Install {appName}",
+    "description": "Install our app for quick access and offline support.",
+    "not_now": "Not now",
+    "install": "Install",
+    "dont_remind": "Don't remind me again",
+    "dismiss_aria": "Dismiss install prompt"
   }
 }

locales/es/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "Introduce una nueva fecha/hora, p. ej. 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "El remitente solicita una confirmación de lectura:",
+      "send": "Enviar confirmación",
+      "ignore": "Ignorar",
+      "sent": "Confirmación de lectura enviada.",
+      "send_failed": "No se pudo enviar la confirmación de lectura",
+      "mdn_subject": "Leído: {subject}",
+      "mdn_body": "Este es un acuse de recibo del mensaje que enviaste a {recipient}.\n\nNota: Este acuse solo confirma que el mensaje se mostró en el ordenador del destinatario. No garantiza que el destinatario haya leído o entendido el contenido."
+    },
     "no_email_selected": "Ningún correo seleccionado",
     "no_email_description": "Seleccione un correo de la lista para verlo aquí",
     "no_conversation_selected": "Ninguna conversación seleccionada",
@@ -538,6 +547,8 @@
     "undo_send": "Deshacer envío"
   },
   "email_composer": {
+    "read_receipt_on": "Confirmación de lectura solicitada (haz clic para desactivar)",
+    "read_receipt_off": "Solicitar confirmación de lectura",
     "new_message": "Nuevo Mensaje",
     "reply": "Responder",
     "reply_all": "Responder a Todos",
@@ -554,8 +565,8 @@
     "send": "Enviar",
     "cancel": "Cancelar",
     "attach": "Adjuntar",
-    "attach_photos": "Fotos y videos",
-    "attach_files": "Archivos",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "Descartar",
     "discard_draft_title": "¿Descartar borrador?",
     "discard_draft_confirm": "Tiene cambios sin guardar. ¿Desea descartar este borrador?",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "El envío programado no es compatible con esta cuenta.",
     "schedule_send_cleanup_warning": "Se creó el envío programado, pero falló la limpieza del borrador.",
     "send_delay_unsupported": "La demora de envío no es compatible con esta cuenta.",
-    "send_delay_unsupported_confirm": "Esta cuenta no admite demora de envío. ¿Enviar inmediatamente?",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "Esta cuenta no admite demora de envío. ¿Enviar inmediatamente?"
   },
   "confirm_dialog": {
     "confirm": "Confirmar",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "Solicitar confirmaciones de lectura de forma predeterminada",
+        "description": "Activar previamente la solicitud de confirmación de lectura al redactar un mensaje nuevo."
+      },
+      "read_receipt_response": {
+        "label": "Responder a las solicitudes de confirmación de lectura",
+        "description": "Qué hacer cuando un mensaje entrante solicita una confirmación de lectura.",
+        "ask": "Preguntar cada vez",
+        "always": "Enviar siempre",
+        "never": "No enviar nunca"
+      },
       "title": "Comportamiento del Correo",
       "description": "Configure cómo se manejan los correos",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "Notas",
       "title": "Carpetas",
       "description": "Administre sus carpetas de correo y asigne roles estándar",
       "folder_list": "Sus carpetas",
@@ -1625,7 +1646,10 @@
       "actions": "Acciones",
       "add_action": "Agregar acción",
       "stop_processing": "Detener el procesamiento de reglas posteriores",
+      "attachment_type_placeholder": "p. ej. pdf, doc, jpg",
+      "value_placeholder_multi": "Valor (varios separados por comas)",
       "condition_fields": {
+        "attachment": "Adjunto",
         "from": "De",
         "to": "Para",
         "cc": "Cc",
@@ -1635,6 +1659,8 @@
         "body": "Cuerpo"
       },
       "comparators": {
+        "has_any": "está presente",
+        "has_type": "del tipo",
         "contains": "contiene",
         "not_contains": "no contiene",
         "is": "es exactamente",
@@ -3048,5 +3074,20 @@
       "manager": "Administrador",
       "custom": "Personalizado"
     }
+  },
+  "quote_header": {
+    "reply_line": "El {date}, {from} escribió:",
+    "forwarded_separator": "---------- Mensaje reenviado ----------",
+    "from_label": "De",
+    "date_label": "Fecha",
+    "subject_label": "Asunto"
+  },
+  "pwa_install": {
+    "title": "Instalar {appName}",
+    "description": "Instala nuestra app para un acceso rápido y soporte sin conexión.",
+    "not_now": "Ahora no",
+    "install": "Instalar",
+    "dont_remind": "No volver a recordármelo",
+    "dismiss_aria": "Cerrar aviso de instalación"
   }
 }

locales/fr/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "Saisissez une nouvelle date/heure, p. ex. 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "L''expéditeur demande un accusé de lecture :",
+      "send": "Envoyer l''accusé",
+      "ignore": "Ignorer",
+      "sent": "Accusé de lecture envoyé.",
+      "send_failed": "Impossible d''envoyer l''accusé de lecture",
+      "mdn_subject": "Lu : {subject}",
+      "mdn_body": "Ceci est un accusé de réception du message que vous avez envoyé à {recipient}.\n\nRemarque : cet accusé confirme uniquement que le message a été affiché sur l''ordinateur du destinataire. Il ne garantit pas que le destinataire a lu ou compris le contenu."
+    },
     "no_email_selected": "Aucun email sélectionné",
     "no_email_description": "Sélectionnez un email dans la liste pour le voir ici",
     "no_conversation_selected": "Aucune conversation sélectionnée",
@@ -538,6 +547,8 @@
     "undo_send": "Annuler l’envoi"
   },
   "email_composer": {
+    "read_receipt_on": "Accusé de lecture demandé (cliquez pour désactiver)",
+    "read_receipt_off": "Demander un accusé de lecture",
     "new_message": "Nouveau message",
     "reply": "Répondre",
     "reply_all": "Répondre à tous",
@@ -554,8 +565,8 @@
     "send": "Envoyer",
     "cancel": "Annuler",
     "attach": "Joindre",
-    "attach_photos": "Photos et vidéos",
-    "attach_files": "Fichiers",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "Supprimer",
     "discard_draft_title": "Supprimer le brouillon ?",
     "discard_draft_confirm": "Vous avez des modifications non enregistrées. Voulez-vous supprimer ce brouillon ?",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "L’envoi planifié n’est pas pris en charge pour ce compte.",
     "schedule_send_cleanup_warning": "L’envoi planifié a été créé, mais le nettoyage du brouillon a échoué.",
     "send_delay_unsupported": "Le délai d’envoi n’est pas pris en charge pour ce compte.",
-    "send_delay_unsupported_confirm": "Ce compte ne prend pas en charge le délai d’envoi. Envoyer immédiatement ?",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "Ce compte ne prend pas en charge le délai d’envoi. Envoyer immédiatement ?"
   },
   "confirm_dialog": {
     "confirm": "Confirmer",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "Demander un accusé de lecture par défaut",
+        "description": "Activer au préalable la demande d''accusé de lecture lors de la rédaction d''un nouveau message."
+      },
+      "read_receipt_response": {
+        "label": "Répondre aux demandes d''accusé de lecture",
+        "description": "Que faire lorsqu''un message entrant demande un accusé de lecture.",
+        "ask": "Demander à chaque fois",
+        "always": "Toujours envoyer",
+        "never": "Ne jamais envoyer"
+      },
       "title": "Comportement email",
       "description": "Configurez la gestion des emails",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "Notes",
       "title": "Dossiers",
       "description": "Gérez vos dossiers de messagerie et attribuez des rôles standard",
       "folder_list": "Vos dossiers",
@@ -1625,7 +1646,10 @@
       "actions": "Actions",
       "add_action": "Ajouter une action",
       "stop_processing": "Arrêter le traitement des règles suivantes",
+      "attachment_type_placeholder": "p. ex. pdf, doc, jpg",
+      "value_placeholder_multi": "Valeur (plusieurs séparées par des virgules)",
       "condition_fields": {
+        "attachment": "Pièce jointe",
         "from": "De",
         "to": "À",
         "cc": "Cc",
@@ -1635,6 +1659,8 @@
         "body": "Corps"
       },
       "comparators": {
+        "has_any": "est présent",
+        "has_type": "de type",
         "contains": "contient",
         "not_contains": "ne contient pas",
         "is": "est exactement",
@@ -3048,5 +3074,20 @@
       "manager": "Gestionnaire",
       "custom": "Personnalisé"
     }
+  },
+  "quote_header": {
+    "reply_line": "Le {date}, {from} a écrit :",
+    "forwarded_separator": "---------- Message transféré ----------",
+    "from_label": "De",
+    "date_label": "Date",
+    "subject_label": "Sujet"
+  },
+  "pwa_install": {
+    "title": "Installer {appName}",
+    "description": "Installez notre application pour un accès rapide et un support hors ligne.",
+    "not_now": "Pas maintenant",
+    "install": "Installer",
+    "dont_remind": "Ne plus me le rappeler",
+    "dismiss_aria": "Fermer l'invite d'installation"
   }
 }

locales/it/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "Inserisci una nuova data/ora, ad es. 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "Il mittente richiede una conferma di lettura:",
+      "send": "Invia conferma",
+      "ignore": "Ignora",
+      "sent": "Conferma di lettura inviata.",
+      "send_failed": "Impossibile inviare la conferma di lettura",
+      "mdn_subject": "Letto: {subject}",
+      "mdn_body": "Questa è una conferma di lettura del messaggio che hai inviato a {recipient}.\n\nNota: questa conferma attesta solo che il messaggio è stato visualizzato sul computer del destinatario. Non garantisce che il destinatario abbia letto o compreso il contenuto."
+    },
     "no_email_selected": "Nessun messaggio selezionato",
     "no_email_description": "Seleziona un messaggio dall'elenco per visualizzarlo qui",
     "no_conversation_selected": "Nessuna conversazione selezionata",
@@ -538,6 +547,8 @@
     "undo_send": "Annulla invio"
   },
   "email_composer": {
+    "read_receipt_on": "Conferma di lettura richiesta (clicca per disattivare)",
+    "read_receipt_off": "Richiedi una conferma di lettura",
     "new_message": "Nuovo messaggio",
     "reply": "Rispondi",
     "reply_all": "Rispondi a tutti",
@@ -554,8 +565,8 @@
     "send": "Invia",
     "cancel": "Annulla",
     "attach": "Allega",
-    "attach_photos": "Foto e video",
-    "attach_files": "File",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "Scarta",
     "discard_draft_title": "Eliminare la bozza?",
     "discard_draft_confirm": "Ci sono modifiche non salvate. Vuoi scartare questa bozza?",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "L’invio programmato non è supportato per questo account.",
     "schedule_send_cleanup_warning": "L’invio programmato è stato creato, ma la pulizia della bozza non è riuscita.",
     "send_delay_unsupported": "Il ritardo di invio non è supportato per questo account.",
-    "send_delay_unsupported_confirm": "Questo account non supporta il ritardo di invio. Inviare subito?",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "Questo account non supporta il ritardo di invio. Inviare subito?"
   },
   "confirm_dialog": {
     "confirm": "Conferma",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "Richiedi conferme di lettura per impostazione predefinita",
+        "description": "Attiva in anticipo la richiesta di conferma di lettura durante la composizione di un nuovo messaggio."
+      },
+      "read_receipt_response": {
+        "label": "Rispondi alle richieste di conferma di lettura",
+        "description": "Cosa fare quando un messaggio in arrivo richiede una conferma di lettura.",
+        "ask": "Chiedi ogni volta",
+        "always": "Invia sempre",
+        "never": "Non inviare mai"
+      },
       "title": "Comportamento email",
       "description": "Configura come vengono gestiti i messaggi",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "Note",
       "title": "Cartelle",
       "description": "Gestisci le cartelle e-mail e assegna ruoli standard",
       "folder_list": "Le tue cartelle",
@@ -1625,7 +1646,10 @@
       "actions": "Azioni",
       "add_action": "Aggiungi azione",
       "stop_processing": "Interrompere l'elaborazione delle regole successive",
+      "attachment_type_placeholder": "es. pdf, doc, jpg",
+      "value_placeholder_multi": "Valore (più valori separati da virgole)",
       "condition_fields": {
+        "attachment": "Allegato",
         "from": "Da",
         "to": "A",
         "cc": "Cc",
@@ -1635,6 +1659,8 @@
         "body": "Corpo"
       },
       "comparators": {
+        "has_any": "è presente",
+        "has_type": "di tipo",
         "contains": "contiene",
         "not_contains": "non contiene",
         "is": "è esattamente",
@@ -3048,5 +3074,20 @@
       "manager": "Gestore",
       "custom": "Personalizzato"
     }
+  },
+  "quote_header": {
+    "reply_line": "Il {date}, {from} ha scritto:",
+    "forwarded_separator": "---------- Messaggio inoltrato ----------",
+    "from_label": "Da",
+    "date_label": "Data",
+    "subject_label": "Oggetto"
+  },
+  "pwa_install": {
+    "title": "Installa {appName}",
+    "description": "Installa la nostra app per un accesso rapido e il supporto offline.",
+    "not_now": "Non ora",
+    "install": "Installa",
+    "dont_remind": "Non ricordarmelo più",
+    "dismiss_aria": "Chiudi avviso di installazione"
   }
 }

locales/ja/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "新しい日時を入力してください。例: 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "送信者が開封確認を求めています：",
+      "send": "確認を送信",
+      "ignore": "無視",
+      "sent": "開封確認を送信しました。",
+      "send_failed": "開封確認を送信できませんでした",
+      "mdn_subject": "開封済み: {subject}",
+      "mdn_body": "これは、あなたが {recipient} に送信したメッセージの開封確認です。\n\n注意: この確認は、メッセージが受信者のコンピューターに表示されたことを示すだけです。受信者が内容を読んだ、または理解したことを保証するものではありません。"
+    },
     "no_email_selected": "メールが選択されていません",
     "no_email_description": "リストからメールを選択して表示してください",
     "no_conversation_selected": "会話が選択されていません",
@@ -538,6 +547,8 @@
     "undo_send": "送信を取り消す"
   },
   "email_composer": {
+    "read_receipt_on": "開封確認を要求中（クリックで無効化）",
+    "read_receipt_off": "開封確認を要求する",
     "new_message": "新規メッセージ",
     "reply": "返信",
     "reply_all": "全員に返信",
@@ -554,8 +565,8 @@
     "send": "送信",
     "cancel": "キャンセル",
     "attach": "添付",
-    "attach_photos": "写真と動画",
-    "attach_files": "ファイル",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "破棄",
     "discard_draft_title": "下書きを破棄しますか？",
     "discard_draft_confirm": "未保存の変更があります。この下書きを破棄しますか？",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "このアカウントでは予約送信はサポートされていません。",
     "schedule_send_cleanup_warning": "予約送信は作成されましたが、下書きのクリーンアップに失敗しました。",
     "send_delay_unsupported": "このアカウントでは送信遅延はサポートされていません。",
-    "send_delay_unsupported_confirm": "このアカウントは送信遅延に対応していません。すぐに送信しますか？",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "このアカウントは送信遅延に対応していません。すぐに送信しますか？"
   },
   "confirm_dialog": {
     "confirm": "確認",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "既定で開封確認を要求する",
+        "description": "新しいメッセージの作成時に、開封確認の要求をあらかじめ有効にします。"
+      },
+      "read_receipt_response": {
+        "label": "開封確認の要求に応答する",
+        "description": "受信メッセージが開封確認を求めたときの動作。",
+        "ask": "毎回確認する",
+        "always": "常に送信",
+        "never": "送信しない"
+      },
       "title": "メール動作",
       "description": "メールの処理方法を設定",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "メモ",
       "title": "フォルダー",
       "description": "メールフォルダーを管理し、標準の役割を割り当てます",
       "folder_list": "フォルダー一覧",
@@ -1625,7 +1646,10 @@
       "actions": "アクション",
       "add_action": "アクションを追加",
       "stop_processing": "以降のルールの処理を停止",
+      "attachment_type_placeholder": "例: pdf, doc, jpg",
+      "value_placeholder_multi": "値（カンマで複数指定可）",
       "condition_fields": {
+        "attachment": "添付ファイル",
         "from": "差出人",
         "to": "宛先",
         "cc": "Cc",
@@ -1635,6 +1659,8 @@
         "body": "本文"
       },
       "comparators": {
+        "has_any": "あり",
+        "has_type": "タイプ",
         "contains": "を含む",
         "not_contains": "を含まない",
         "is": "と完全一致",
@@ -3048,5 +3074,20 @@
       "manager": "管理者",
       "custom": "カスタム"
     }
+  },
+  "quote_header": {
+    "reply_line": "{date}に{from}が書きました:",
+    "forwarded_separator": "---------- 転送メッセージ ----------",
+    "from_label": "差出人",
+    "date_label": "日付",
+    "subject_label": "件名"
+  },
+  "pwa_install": {
+    "title": "{appName} をインストール",
+    "description": "素早いアクセスとオフライン対応のため、アプリをインストールしましょう。",
+    "not_now": "後で",
+    "install": "インストール",
+    "dont_remind": "今後表示しない",
+    "dismiss_aria": "インストールプロンプトを閉じる"
   }
 }

locales/ko/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "새 날짜/시간을 입력하세요. 예: 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "보낸 사람이 읽음 확인을 요청합니다:",
+      "send": "확인 보내기",
+      "ignore": "무시",
+      "sent": "읽음 확인을 보냈습니다.",
+      "send_failed": "읽음 확인을 보낼 수 없습니다",
+      "mdn_subject": "읽음: {subject}",
+      "mdn_body": "이것은 {recipient}(으)로 보낸 메시지에 대한 읽음 확인입니다.\n\n참고: 이 확인은 메시지가 수신자의 컴퓨터에 표시되었음을 알릴 뿐입니다. 수신자가 내용을 읽거나 이해했다는 보장은 없습니다."
+    },
     "no_email_selected": "메일이 선택되지 않았어요",
     "no_email_description": "목록에서 메일을 선택하면 여기에 내용이 표시돼요",
     "no_conversation_selected": "대화가 선택되지 않았어요",
@@ -538,6 +547,8 @@
     "undo_send": "보내기 실행 취소"
   },
   "email_composer": {
+    "read_receipt_on": "읽음 확인 요청됨 (클릭하여 해제)",
+    "read_receipt_off": "읽음 확인 요청",
     "new_message": "새 메시지",
     "reply": "답장",
     "reply_all": "전체 답장",
@@ -554,8 +565,8 @@
     "send": "보내기",
     "cancel": "취소",
     "attach": "첨부",
-    "attach_photos": "사진 및 동영상",
-    "attach_files": "파일",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "삭제",
     "discard_draft_title": "임시보관 메일을 삭제할까요?",
     "discard_draft_confirm": "저장되지 않은 내용이 있어요. 이 메일을 삭제할까요?",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "이 계정은 예약 보내기를 지원하지 않습니다.",
     "schedule_send_cleanup_warning": "예약 보내기는 생성되었지만 초안 정리에 실패했습니다.",
     "send_delay_unsupported": "이 계정은 보내기 지연을 지원하지 않습니다.",
-    "send_delay_unsupported_confirm": "이 계정은 보내기 지연을 지원하지 않습니다. 바로 보낼까요?",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "이 계정은 보내기 지연을 지원하지 않습니다. 바로 보낼까요?"
   },
   "confirm_dialog": {
     "confirm": "확인",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "기본적으로 읽음 확인 요청",
+        "description": "새 메시지를 작성할 때 읽음 확인 요청을 미리 켭니다."
+      },
+      "read_receipt_response": {
+        "label": "읽음 확인 요청에 응답",
+        "description": "수신 메시지가 읽음 확인을 요청할 때의 동작.",
+        "ask": "매번 묻기",
+        "always": "항상 보내기",
+        "never": "보내지 않음"
+      },
       "title": "메일 동작",
       "description": "이메일 관련 동작 방식을 설정해 주세요",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "메모",
       "title": "폴더",
       "description": "이메일 폴더를 관리하고 기본 역할을 지정해 보세요",
       "folder_list": "내 폴더",
@@ -1625,7 +1646,10 @@
       "actions": "동작",
       "add_action": "동작 추가",
       "stop_processing": "이후 규칙 무시하기",
+      "attachment_type_placeholder": "예: pdf, doc, jpg",
+      "value_placeholder_multi": "값 (쉼표로 여러 개 구분)",
       "condition_fields": {
+        "attachment": "첨부 파일",
         "from": "보낸 사람",
         "to": "받는 사람",
         "cc": "참조",
@@ -1635,6 +1659,8 @@
         "body": "본문"
       },
       "comparators": {
+        "has_any": "있음",
+        "has_type": "유형",
         "contains": "포함함",
         "not_contains": "포함하지 않음",
         "is": "정확히 일치",
@@ -3048,5 +3074,20 @@
       "manager": "관리자",
       "custom": "사용자 지정"
     }
+  },
+  "quote_header": {
+    "reply_line": "{date}에 {from}님이 작성:",
+    "forwarded_separator": "---------- 전달된 메시지 ----------",
+    "from_label": "보낸 사람",
+    "date_label": "날짜",
+    "subject_label": "제목"
+  },
+  "pwa_install": {
+    "title": "{appName} 설치",
+    "description": "빠른 액세스와 오프라인 지원을 위해 앱을 설치하세요.",
+    "not_now": "나중에",
+    "install": "설치",
+    "dont_remind": "다시 알리지 않음",
+    "dismiss_aria": "설치 프롬프트 닫기"
   }
 }

locales/lv/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "Ievadiet jaunu datumu/laiku, piem. 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "Sūtītājs pieprasa lasīšanas apstiprinājumu:",
+      "send": "Sūtīt apstiprinājumu",
+      "ignore": "Ignorēt",
+      "sent": "Lasīšanas apstiprinājums nosūtīts.",
+      "send_failed": "Neizdevās nosūtīt lasīšanas apstiprinājumu",
+      "mdn_subject": "Izlasīts: {subject}",
+      "mdn_body": "Šis ir lasīšanas apstiprinājums ziņojumam, ko nosūtījāt uz {recipient}.\n\nPiezīme: šis apstiprinājums tikai apliecina, ka ziņojums tika parādīts saņēmēja datorā. Tas negarantē, ka saņēmējs ir izlasījis vai sapratis saturu."
+    },
     "no_email_selected": "Nav atlasīta neviena vēstule",
     "no_email_description": "Atlasiet vēstuli no saraksta, lai to skatītu šeit",
     "no_conversation_selected": "Nav atlasīta saruna",
@@ -538,6 +547,8 @@
     "undo_send": "Atsaukt sūtīšanu"
   },
   "email_composer": {
+    "read_receipt_on": "Pieprasīts lasīšanas apstiprinājums (noklikšķiniet, lai atspējotu)",
+    "read_receipt_off": "Pieprasīt lasīšanas apstiprinājumu",
     "new_message": "Jauns ziņojums",
     "reply": "Atbildēt",
     "reply_all": "Atbildēt visiem",
@@ -554,8 +565,8 @@
     "send": "Sūtīt",
     "cancel": "Atcelt",
     "attach": "Pievienot",
-    "attach_photos": "Fotoattēli un video",
-    "attach_files": "Faili",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "Atmest",
     "discard_draft_title": "Atmest melnrakstu?",
     "discard_draft_confirm": "Ir nesaglabātas izmaiņas. Vai tiešām vēlaties atmest šo melnrakstu?",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "Šim kontam ieplānota sūtīšana netiek atbalstīta.",
     "schedule_send_cleanup_warning": "Ieplānotā sūtīšana tika izveidota, bet melnraksta tīrīšana neizdevās.",
     "send_delay_unsupported": "Šim kontam sūtīšanas aizture netiek atbalstīta.",
-    "send_delay_unsupported_confirm": "Šis konts neatbalsta sūtīšanas aizturi. Sūtīt uzreiz?",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "Šis konts neatbalsta sūtīšanas aizturi. Sūtīt uzreiz?"
   },
   "confirm_dialog": {
     "confirm": "Apstiprināt",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "Pēc noklusējuma pieprasīt lasīšanas apstiprinājumus",
+        "description": "Sastādot jaunu ziņojumu, iepriekš ieslēgt lasīšanas apstiprinājuma pieprasījumu."
+      },
+      "read_receipt_response": {
+        "label": "Atbildēt uz lasīšanas apstiprinājuma pieprasījumiem",
+        "description": "Ko darīt, kad ienākošs ziņojums pieprasa lasīšanas apstiprinājumu.",
+        "ask": "Vaicāt katru reizi",
+        "always": "Vienmēr sūtīt",
+        "never": "Nekad nesūtīt"
+      },
       "title": "Pasta darbība",
       "description": "Pielāgojiet vēstuļu apstrādi",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "Piezīmes",
       "title": "Mapes",
       "description": "Pārvaldiet pasta mapes un piešķiriet tām lomas",
       "folder_list": "Jūsu mapes",
@@ -1625,7 +1646,10 @@
       "actions": "Darbības",
       "add_action": "Pievienot darbību",
       "stop_processing": "Pārtraukt nākamo noteikumu apstrādi",
+      "attachment_type_placeholder": "piem. pdf, doc, jpg",
+      "value_placeholder_multi": "Vērtība (vairākas atdalītas ar komatu)",
       "condition_fields": {
+        "attachment": "Pielikums",
         "from": "No",
         "to": "Kam",
         "cc": "Kopija",
@@ -1635,6 +1659,8 @@
         "body": "Teksts"
       },
       "comparators": {
+        "has_any": "ir klāt",
+        "has_type": "tipa",
         "contains": "satur",
         "not_contains": "nesatur",
         "is": "precīzi sakrīt",
@@ -3048,5 +3074,20 @@
       "manager": "Pārvaldnieks",
       "custom": "Pielāgots"
     }
+  },
+  "quote_header": {
+    "reply_line": "{date} {from} rakstīja:",
+    "forwarded_separator": "---------- Pārsūtītā ziņa ----------",
+    "from_label": "No",
+    "date_label": "Datums",
+    "subject_label": "Tēma"
+  },
+  "pwa_install": {
+    "title": "Instalēt {appName}",
+    "description": "Instalējiet mūsu lietotni ātrai piekļuvei un bezsaistes atbalstam.",
+    "not_now": "Ne tagad",
+    "install": "Instalēt",
+    "dont_remind": "Vairs man neatgādināt",
+    "dismiss_aria": "Aizvērt instalēšanas paziņojumu"
   }
 }

locales/nl/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "Voer een nieuwe datum/tijd in, bijv. 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "De afzender vraagt om een leesbevestiging:",
+      "send": "Bevestiging verzenden",
+      "ignore": "Negeren",
+      "sent": "Leesbevestiging verzonden.",
+      "send_failed": "Leesbevestiging kon niet worden verzonden",
+      "mdn_subject": "Gelezen: {subject}",
+      "mdn_body": "Dit is een leesbevestiging voor het bericht dat u hebt verzonden naar {recipient}.\n\nLet op: deze bevestiging geeft alleen aan dat het bericht is weergegeven op de computer van de ontvanger. Er is geen garantie dat de ontvanger de inhoud heeft gelezen of begrepen."
+    },
     "no_email_selected": "Geen e-mail geselecteerd",
     "no_email_description": "Selecteer een e-mail uit de lijst om deze hier te bekijken",
     "no_conversation_selected": "Geen gesprek geselecteerd",
@@ -538,6 +547,8 @@
     "undo_send": "Verzenden ongedaan maken"
   },
   "email_composer": {
+    "read_receipt_on": "Leesbevestiging aangevraagd (klik om uit te schakelen)",
+    "read_receipt_off": "Leesbevestiging aanvragen",
     "new_message": "Nieuw bericht",
     "reply": "Beantwoorden",
     "reply_all": "Allen beantwoorden",
@@ -554,8 +565,8 @@
     "send": "Verzenden",
     "cancel": "Annuleren",
     "attach": "Bijlage toevoegen",
-    "attach_photos": "Foto's en video's",
-    "attach_files": "Bestanden",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "Verwijderen",
     "discard_draft_title": "Concept verwijderen?",
     "discard_draft_confirm": "Je hebt niet-opgeslagen wijzigingen. Wil je dit concept verwijderen?",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "Gepland verzenden wordt niet ondersteund voor dit account.",
     "schedule_send_cleanup_warning": "Gepland verzenden is aangemaakt, maar het opschonen van de conceptversie is mislukt.",
     "send_delay_unsupported": "Verzendvertraging wordt niet ondersteund voor dit account.",
-    "send_delay_unsupported_confirm": "Dit account ondersteunt geen verzendvertraging. Meteen verzenden?",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "Dit account ondersteunt geen verzendvertraging. Meteen verzenden?"
   },
   "confirm_dialog": {
     "confirm": "Bevestigen",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "Standaard om leesbevestiging vragen",
+        "description": "De aanvraag voor een leesbevestiging vooraf inschakelen bij het opstellen van een nieuw bericht."
+      },
+      "read_receipt_response": {
+        "label": "Reageren op verzoeken om leesbevestiging",
+        "description": "Wat te doen wanneer een inkomend bericht om een leesbevestiging vraagt.",
+        "ask": "Elke keer vragen",
+        "always": "Altijd verzenden",
+        "never": "Nooit verzenden"
+      },
       "title": "E-mailgedrag",
       "description": "Configureer hoe e-mails worden verwerkt",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "Notities",
       "title": "Mappen",
       "description": "Beheer uw e-mailmappen en wijs standaardrollen toe",
       "folder_list": "Uw mappen",
@@ -1625,7 +1646,10 @@
       "actions": "Acties",
       "add_action": "Actie toevoegen",
       "stop_processing": "Verwerking van volgende regels stoppen",
+      "attachment_type_placeholder": "bijv. pdf, doc, jpg",
+      "value_placeholder_multi": "Waarde (meerdere met komma's gescheiden)",
       "condition_fields": {
+        "attachment": "Bijlage",
         "from": "Van",
         "to": "Aan",
         "cc": "Cc",
@@ -1635,6 +1659,8 @@
         "body": "Inhoud"
       },
       "comparators": {
+        "has_any": "aanwezig",
+        "has_type": "van type",
         "contains": "bevat",
         "not_contains": "bevat niet",
         "is": "is precies",
@@ -3048,5 +3074,20 @@
       "manager": "Beheerder",
       "custom": "Aangepast"
     }
+  },
+  "quote_header": {
+    "reply_line": "Op {date} schreef {from}:",
+    "forwarded_separator": "---------- Doorgestuurd bericht ----------",
+    "from_label": "Van",
+    "date_label": "Datum",
+    "subject_label": "Onderwerp"
+  },
+  "pwa_install": {
+    "title": "{appName} installeren",
+    "description": "Installeer onze app voor snelle toegang en offline-ondersteuning.",
+    "not_now": "Niet nu",
+    "install": "Installeren",
+    "dont_remind": "Niet meer herinneren",
+    "dismiss_aria": "Installatiemelding sluiten"
   }
 }

locales/pl/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "Wprowadź nową datę/godzinę, np. 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "Nadawca prosi o potwierdzenie przeczytania:",
+      "send": "Wyślij potwierdzenie",
+      "ignore": "Ignoruj",
+      "sent": "Wysłano potwierdzenie przeczytania.",
+      "send_failed": "Nie udało się wysłać potwierdzenia przeczytania",
+      "mdn_subject": "Przeczytano: {subject}",
+      "mdn_body": "To jest potwierdzenie przeczytania wiadomości wysłanej do {recipient}.\n\nUwaga: to potwierdzenie oznacza jedynie, że wiadomość została wyświetlona na komputerze odbiorcy. Nie gwarantuje, że odbiorca przeczytał lub zrozumiał treść."
+    },
     "no_email_selected": "Nie wybrano wiadomości",
     "no_email_description": "Wybierz wiadomość z listy, aby ją wyświetlić",
     "no_conversation_selected": "Nie wybrano konwersacji",
@@ -538,6 +547,8 @@
     "undo_send": "Cofnij wysyłkę"
   },
   "email_composer": {
+    "read_receipt_on": "Zażądano potwierdzenia przeczytania (kliknij, aby wyłączyć)",
+    "read_receipt_off": "Zażądaj potwierdzenia przeczytania",
     "new_message": "Nowa wiadomość",
     "reply": "Odpowiedz",
     "reply_all": "Odpowiedz wszystkim",
@@ -554,8 +565,8 @@
     "send": "Wyślij",
     "cancel": "Anuluj",
     "attach": "Załącz",
-    "attach_photos": "Zdjęcia i filmy",
-    "attach_files": "Pliki",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "Odrzuć",
     "discard_draft_title": "Odrzucić szkic?",
     "discard_draft_confirm": "Masz niezapisane zmiany. Czy chcesz odrzucić ten szkic?",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "Zaplanowana wysyłka nie jest obsługiwana dla tego konta.",
     "schedule_send_cleanup_warning": "Zaplanowana wysyłka została utworzona, ale czyszczenie wersji roboczej nie powiodło się.",
     "send_delay_unsupported": "Opóźnienie wysyłki nie jest obsługiwane dla tego konta.",
-    "send_delay_unsupported_confirm": "To konto nie obsługuje opóźnienia wysyłki. Wysłać natychmiast?",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "To konto nie obsługuje opóźnienia wysyłki. Wysłać natychmiast?"
   },
   "confirm_dialog": {
     "confirm": "Potwierdź",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "Domyślnie żądaj potwierdzeń przeczytania",
+        "description": "Włącz wcześniej żądanie potwierdzenia przeczytania podczas tworzenia nowej wiadomości."
+      },
+      "read_receipt_response": {
+        "label": "Odpowiadaj na żądania potwierdzenia przeczytania",
+        "description": "Co zrobić, gdy przychodząca wiadomość prosi o potwierdzenie przeczytania.",
+        "ask": "Pytaj za każdym razem",
+        "always": "Zawsze wysyłaj",
+        "never": "Nigdy nie wysyłaj"
+      },
       "title": "Zachowanie poczty e-mail",
       "description": "Skonfiguruj sposób obsługi wiadomości e-mail",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "Notatki",
       "title": "Foldery",
       "description": "Zarządzaj folderami poczty i przypisuj standardowe role",
       "folder_list": "Twoje foldery",
@@ -1625,7 +1646,10 @@
       "actions": "Akcje",
       "add_action": "Dodaj akcję",
       "stop_processing": "Zatrzymaj przetwarzanie kolejnych reguł",
+      "attachment_type_placeholder": "np. pdf, doc, jpg",
+      "value_placeholder_multi": "Wartość (kilka oddzielonych przecinkami)",
       "condition_fields": {
+        "attachment": "Załącznik",
         "from": "Od",
         "to": "Do",
         "cc": "DW",
@@ -1635,6 +1659,8 @@
         "body": "Treść"
       },
       "comparators": {
+        "has_any": "jest obecny",
+        "has_type": "typu",
         "contains": "zawiera",
         "not_contains": "nie zawiera",
         "is": "jest dokładnie",
@@ -3048,5 +3074,20 @@
       "manager": "Menedżer",
       "custom": "Niestandardowe"
     }
+  },
+  "quote_header": {
+    "reply_line": "{date}, {from} napisał(a):",
+    "forwarded_separator": "---------- Wiadomość przekazana ----------",
+    "from_label": "Od",
+    "date_label": "Data",
+    "subject_label": "Temat"
+  },
+  "pwa_install": {
+    "title": "Zainstaluj {appName}",
+    "description": "Zainstaluj naszą aplikację, aby uzyskać szybki dostęp i obsługę offline.",
+    "not_now": "Nie teraz",
+    "install": "Zainstaluj",
+    "dont_remind": "Nie przypominaj mi więcej",
+    "dismiss_aria": "Zamknij monit instalacji"
   }
 }

locales/pt/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "Informe uma nova data/hora, ex. 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "O remetente solicita uma confirmação de leitura:",
+      "send": "Enviar confirmação",
+      "ignore": "Ignorar",
+      "sent": "Confirmação de leitura enviada.",
+      "send_failed": "Não foi possível enviar a confirmação de leitura",
+      "mdn_subject": "Lido: {subject}",
+      "mdn_body": "Este é um aviso de leitura da mensagem que você enviou para {recipient}.\n\nObservação: este aviso apenas confirma que a mensagem foi exibida no computador do destinatário. Não há garantia de que o destinatário tenha lido ou compreendido o conteúdo."
+    },
     "no_email_selected": "Nenhum e-mail selecionado",
     "no_email_description": "Selecione um e-mail da lista para visualizá-lo aqui",
     "no_conversation_selected": "Nenhuma conversa selecionada",
@@ -538,6 +547,8 @@
     "undo_send": "Desfazer envio"
   },
   "email_composer": {
+    "read_receipt_on": "Confirmação de leitura solicitada (clique para desativar)",
+    "read_receipt_off": "Solicitar confirmação de leitura",
     "new_message": "Nova Mensagem",
     "reply": "Responder",
     "reply_all": "Responder a Todos",
@@ -554,8 +565,8 @@
     "send": "Enviar",
     "cancel": "Cancelar",
     "attach": "Anexar",
-    "attach_photos": "Fotos e vídeos",
-    "attach_files": "Arquivos",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "Descartar",
     "discard_draft_title": "Descartar rascunho?",
     "discard_draft_confirm": "Você tem alterações não salvas. Deseja descartar este rascunho?",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "Envio agendado não é compatível com esta conta.",
     "schedule_send_cleanup_warning": "O envio agendado foi criado, mas a limpeza do rascunho falhou.",
     "send_delay_unsupported": "Atraso de envio não é compatível com esta conta.",
-    "send_delay_unsupported_confirm": "Esta conta não oferece atraso de envio. Enviar imediatamente?",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "Esta conta não oferece atraso de envio. Enviar imediatamente?"
   },
   "confirm_dialog": {
     "confirm": "Confirmar",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "Solicitar confirmações de leitura por padrão",
+        "description": "Ativar previamente a solicitação de confirmação de leitura ao redigir uma nova mensagem."
+      },
+      "read_receipt_response": {
+        "label": "Responder a solicitações de confirmação de leitura",
+        "description": "O que fazer quando uma mensagem recebida solicita uma confirmação de leitura.",
+        "ask": "Perguntar sempre",
+        "always": "Enviar sempre",
+        "never": "Nunca enviar"
+      },
       "title": "Comportamento de E-mail",
       "description": "Configure como os e-mails são manipulados",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "Notas",
       "title": "Pastas",
       "description": "Gerencie suas pastas de e-mail e atribua funções padrão",
       "folder_list": "Suas pastas",
@@ -1625,7 +1646,10 @@
       "actions": "Ações",
       "add_action": "Adicionar ação",
       "stop_processing": "Parar o processamento das regras seguintes",
+      "attachment_type_placeholder": "ex.: pdf, doc, jpg",
+      "value_placeholder_multi": "Valor (vários separados por vírgulas)",
       "condition_fields": {
+        "attachment": "Anexo",
         "from": "De",
         "to": "Para",
         "cc": "Cc",
@@ -1635,6 +1659,8 @@
         "body": "Corpo"
       },
       "comparators": {
+        "has_any": "está presente",
+        "has_type": "do tipo",
         "contains": "contém",
         "not_contains": "não contém",
         "is": "é exatamente",
@@ -3048,5 +3074,20 @@
       "manager": "Gerente",
       "custom": "Personalizado"
     }
+  },
+  "quote_header": {
+    "reply_line": "Em {date}, {from} escreveu:",
+    "forwarded_separator": "---------- Mensagem encaminhada ----------",
+    "from_label": "De",
+    "date_label": "Data",
+    "subject_label": "Assunto"
+  },
+  "pwa_install": {
+    "title": "Instalar {appName}",
+    "description": "Instale o nosso app para acesso rápido e suporte offline.",
+    "not_now": "Agora não",
+    "install": "Instalar",
+    "dont_remind": "Não lembrar novamente",
+    "dismiss_aria": "Dispensar aviso de instalação"
   }
 }

locales/ru/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "Введите новую дату/время, например 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "Отправитель запрашивает уведомление о прочтении:",
+      "send": "Отправить уведомление",
+      "ignore": "Игнорировать",
+      "sent": "Уведомление о прочтении отправлено.",
+      "send_failed": "Не удалось отправить уведомление о прочтении",
+      "mdn_subject": "Прочитано: {subject}",
+      "mdn_body": "Это уведомление о прочтении сообщения, отправленного вами на адрес {recipient}.\n\nПримечание: это уведомление лишь подтверждает, что сообщение было показано на компьютере получателя. Оно не гарантирует, что получатель прочитал или понял содержимое."
+    },
     "no_email_selected": "Письмо не выбрано",
     "no_email_description": "Выберите письмо из списка, чтобы просмотреть его здесь",
     "no_conversation_selected": "Беседа не выбрана",
@@ -538,6 +547,8 @@
     "undo_send": "Отменить отправку"
   },
   "email_composer": {
+    "read_receipt_on": "Запрошено уведомление о прочтении (нажмите, чтобы отключить)",
+    "read_receipt_off": "Запросить уведомление о прочтении",
     "new_message": "Новое письмо",
     "reply": "Ответить",
     "reply_all": "Ответить всем",
@@ -554,8 +565,8 @@
     "send": "Отправить",
     "cancel": "Отмена",
     "attach": "Прикрепить",
-    "attach_photos": "Фото и видео",
-    "attach_files": "Файлы",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "Удалить",
     "discard_draft_title": "Удалить черновик?",
     "discard_draft_confirm": "Есть несохранённые изменения. Удалить этот черновик?",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "Запланированная отправка не поддерживается для этой учетной записи.",
     "schedule_send_cleanup_warning": "Запланированная отправка создана, но очистка черновика не удалась.",
     "send_delay_unsupported": "Задержка отправки не поддерживается для этой учетной записи.",
-    "send_delay_unsupported_confirm": "Эта учетная запись не поддерживает задержку отправки. Отправить сразу?",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "Эта учетная запись не поддерживает задержку отправки. Отправить сразу?"
   },
   "confirm_dialog": {
     "confirm": "Подтвердить",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "Запрашивать уведомления о прочтении по умолчанию",
+        "description": "Заранее включать запрос уведомления о прочтении при создании нового сообщения."
+      },
+      "read_receipt_response": {
+        "label": "Отвечать на запросы уведомления о прочтении",
+        "description": "Что делать, когда входящее сообщение запрашивает уведомление о прочтении.",
+        "ask": "Спрашивать каждый раз",
+        "always": "Всегда отправлять",
+        "never": "Никогда не отправлять"
+      },
       "title": "Поведение почты",
       "description": "Настройте обработку писем",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "Заметки",
       "title": "Папки",
       "description": "Управляйте папками почты и назначайте стандартные роли",
       "folder_list": "Ваши папки",
@@ -1625,7 +1646,10 @@
       "actions": "Действия",
       "add_action": "Добавить действие",
       "stop_processing": "Прекратить обработку последующих правил",
+      "attachment_type_placeholder": "напр. pdf, doc, jpg",
+      "value_placeholder_multi": "Значение (несколько через запятую)",
       "condition_fields": {
+        "attachment": "Вложение",
         "from": "От",
         "to": "Кому",
         "cc": "Копия",
@@ -1635,6 +1659,8 @@
         "body": "Тело"
       },
       "comparators": {
+        "has_any": "присутствует",
+        "has_type": "типа",
         "contains": "содержит",
         "not_contains": "не содержит",
         "is": "точно совпадает",
@@ -3048,5 +3074,20 @@
       "manager": "Управляющий",
       "custom": "Пользовательский"
     }
+  },
+  "quote_header": {
+    "reply_line": "{date}, {from} написал:",
+    "forwarded_separator": "---------- Пересланное сообщение ----------",
+    "from_label": "От",
+    "date_label": "Дата",
+    "subject_label": "Тема"
+  },
+  "pwa_install": {
+    "title": "Установить {appName}",
+    "description": "Установите наше приложение для быстрого доступа и работы офлайн.",
+    "not_now": "Не сейчас",
+    "install": "Установить",
+    "dont_remind": "Больше не напоминать",
+    "dismiss_aria": "Закрыть запрос на установку"
   }
 }

locales/tr/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "Yeni tarih/saat girin, ör. 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "Gönderen bir okundu bilgisi istiyor:",
+      "send": "Bilgi gönder",
+      "ignore": "Yoksay",
+      "sent": "Okundu bilgisi gönderildi.",
+      "send_failed": "Okundu bilgisi gönderilemedi",
+      "mdn_subject": "Okundu: {subject}",
+      "mdn_body": "Bu, {recipient} adresine gönderdiğiniz iletinin okundu bilgisidir.\n\nNot: Bu bilgi yalnızca iletinin alıcının bilgisayarında görüntülendiğini belirtir. Alıcının içeriği okuduğunu veya anladığını garanti etmez."
+    },
     "no_email_selected": "E-posta seçilmedi",
     "no_email_description": "Burada görüntülemek için listeden bir e-posta seçin",
     "no_conversation_selected": "Konuşma seçilmedi",
@@ -538,6 +547,8 @@
     "undo_send": "Göndermeyi geri al"
   },
   "email_composer": {
+    "read_receipt_on": "Okundu bilgisi istendi (devre dışı bırakmak için tıklayın)",
+    "read_receipt_off": "Okundu bilgisi iste",
     "new_message": "Yeni İleti",
     "reply": "Yanıtla",
     "reply_all": "Tümünü Yanıtla",
@@ -554,8 +565,8 @@
     "send": "Gönder",
     "cancel": "İptal",
     "attach": "Ekle",
-    "attach_photos": "Fotoğraflar ve videolar",
-    "attach_files": "Dosyalar",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "Vazgeç",
     "discard_draft_title": "Taslaktan vazgeçilsin mi?",
     "discard_draft_confirm": "Kaydedilmemiş değişiklikleriniz var. Bu taslaktan vazgeçmek istiyor musunuz?",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "Bu hesap için zamanlanmış gönderim desteklenmiyor.",
     "schedule_send_cleanup_warning": "Zamanlanmış gönderim oluşturuldu, ancak taslak temizliği başarısız oldu.",
     "send_delay_unsupported": "Bu hesap için gönderim gecikmesi desteklenmiyor.",
-    "send_delay_unsupported_confirm": "Bu hesap gönderim gecikmesini desteklemiyor. Hemen gönderilsin mi?",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "Bu hesap gönderim gecikmesini desteklemiyor. Hemen gönderilsin mi?"
   },
   "confirm_dialog": {
     "confirm": "Onayla",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "Varsayılan olarak okundu bilgisi iste",
+        "description": "Yeni bir ileti yazarken okundu bilgisi isteğini önceden etkinleştir."
+      },
+      "read_receipt_response": {
+        "label": "Okundu bilgisi isteklerine yanıt ver",
+        "description": "Gelen bir ileti okundu bilgisi istediğinde ne yapılacağı.",
+        "ask": "Her seferinde sor",
+        "always": "Her zaman gönder",
+        "never": "Asla gönderme"
+      },
       "title": "E-posta Davranışı",
       "description": "E-postaların nasıl işleneceğini yapılandırın",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "Notlar",
       "title": "Klasörler",
       "description": "E-posta klasörlerinizi yönetin ve standart roller atayın",
       "folder_list": "Klasörleriniz",
@@ -1625,7 +1646,10 @@
       "actions": "İşlemler",
       "add_action": "İşlem Ekle",
       "stop_processing": "Sonraki kuralları işlemeyi durdur",
+      "attachment_type_placeholder": "örn. pdf, doc, jpg",
+      "value_placeholder_multi": "Değer (birden fazla virgülle ayrılır)",
       "condition_fields": {
+        "attachment": "Ek",
         "from": "Kimden",
         "to": "Kime",
         "cc": "Bilgi",
@@ -1635,6 +1659,8 @@
         "body": "Gövde"
       },
       "comparators": {
+        "has_any": "mevcut",
+        "has_type": "türünde",
         "contains": "içerir",
         "not_contains": "içermez",
         "is": "tam olarak",
@@ -3048,5 +3074,20 @@
   },
   "unified_mailbox": {
     "search_unavailable": "Birleşik görünümde arama kullanılamaz"
+  },
+  "quote_header": {
+    "reply_line": "{date} tarihinde {from} şunu yazdı:",
+    "forwarded_separator": "---------- İletilen mesaj ----------",
+    "from_label": "Kimden",
+    "date_label": "Tarih",
+    "subject_label": "Konu"
+  },
+  "pwa_install": {
+    "title": "{appName} uygulamasını yükle",
+    "description": "Hızlı erişim ve çevrimdışı destek için uygulamamızı yükleyin.",
+    "not_now": "Şimdi değil",
+    "install": "Yükle",
+    "dont_remind": "Bir daha hatırlatma",
+    "dismiss_aria": "Yükleme istemini kapat"
   }
 }

locales/uk/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "Введіть нову дату/час, напр. 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "Відправник запитує сповіщення про прочитання:",
+      "send": "Надіслати сповіщення",
+      "ignore": "Ігнорувати",
+      "sent": "Сповіщення про прочитання надіслано.",
+      "send_failed": "Не вдалося надіслати сповіщення про прочитання",
+      "mdn_subject": "Прочитано: {subject}",
+      "mdn_body": "Це сповіщення про прочитання повідомлення, яке ви надіслали на адресу {recipient}.\n\nПримітка: це сповіщення лише підтверджує, що повідомлення було показано на комп''ютері отримувача. Воно не гарантує, що отримувач прочитав або зрозумів вміст."
+    },
     "no_email_selected": "Електронна адреса не вибрана",
     "no_email_description": "Виберіть електронний лист зі списку, щоб переглянути його тут",
     "no_conversation_selected": "Розмова не вибрана",
@@ -538,6 +547,8 @@
     "undo_send": "Скасувати надсилання"
   },
   "email_composer": {
+    "read_receipt_on": "Запитано сповіщення про прочитання (натисніть, щоб вимкнути)",
+    "read_receipt_off": "Запитати сповіщення про прочитання",
     "new_message": "Нове повідомлення",
     "reply": "Відповісти",
     "reply_all": "Відповісти всім",
@@ -554,8 +565,8 @@
     "send": "Надіслати",
     "cancel": "Скасувати",
     "attach": "Прикріпити",
-    "attach_photos": "Фото та відео",
-    "attach_files": "Файли",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "Відкинути",
     "discard_draft_title": "Відхилити чернетку?",
     "discard_draft_confirm": "У вас є незбережені зміни. Ви хочете відхилити цю чернетку?",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "Заплановане надсилання не підтримується для цього облікового запису.",
     "schedule_send_cleanup_warning": "Заплановане надсилання створено, але очищення чернетки не вдалося.",
     "send_delay_unsupported": "Затримка надсилання не підтримується для цього облікового запису.",
-    "send_delay_unsupported_confirm": "Цей обліковий запис не підтримує затримку надсилання. Надіслати негайно?",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "Цей обліковий запис не підтримує затримку надсилання. Надіслати негайно?"
   },
   "confirm_dialog": {
     "confirm": "Підтвердити",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "Запитувати сповіщення про прочитання за замовчуванням",
+        "description": "Заздалегідь вмикати запит сповіщення про прочитання під час створення нового повідомлення."
+      },
+      "read_receipt_response": {
+        "label": "Відповідати на запити сповіщення про прочитання",
+        "description": "Що робити, коли вхідне повідомлення запитує сповіщення про прочитання.",
+        "ask": "Запитувати щоразу",
+        "always": "Завжди надсилати",
+        "never": "Ніколи не надсилати"
+      },
       "title": "Поведінка електронної пошти",
       "description": "Налаштувати спосіб обробки електронних листів",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "Нотатки",
       "title": "Папки",
       "description": "Керуйте своїми папками електронної пошти та призначайте стандартні ролі",
       "folder_list": "Ваші папки",
@@ -1625,7 +1646,10 @@
       "actions": "Дії",
       "add_action": "Додати дію",
       "stop_processing": "Зупинити обробку наступних правил",
+      "attachment_type_placeholder": "напр. pdf, doc, jpg",
+      "value_placeholder_multi": "Значення (декілька через кому)",
       "condition_fields": {
+        "attachment": "Вкладення",
         "from": "Від",
         "to": "до",
         "cc": "Cc",
@@ -1635,6 +1659,8 @@
         "body": "Тіло"
       },
       "comparators": {
+        "has_any": "присутнє",
+        "has_type": "типу",
         "contains": "містить",
         "not_contains": "не містить",
         "is": "точно",
@@ -3048,5 +3074,20 @@
       "manager": "Керівник",
       "custom": "Власне"
     }
+  },
+  "quote_header": {
+    "reply_line": "{date}, {from} написав:",
+    "forwarded_separator": "---------- Переслане повідомлення ----------",
+    "from_label": "Від",
+    "date_label": "Дата",
+    "subject_label": "Тема"
+  },
+  "pwa_install": {
+    "title": "Встановити {appName}",
+    "description": "Встановіть наш застосунок для швидкого доступу та офлайн-підтримки.",
+    "not_now": "Не зараз",
+    "install": "Встановити",
+    "dont_remind": "Більше не нагадувати",
+    "dismiss_aria": "Закрити запит на встановлення"
   }
 }

locales/zh/common.json

@@ -253,6 +253,15 @@
     "reschedule_prompt": "输入新的日期/时间，例如 2026-05-04T15:30"
   },
   "email_viewer": {
+    "read_receipt": {
+      "prompt": "发件人请求已读回执：",
+      "send": "发送回执",
+      "ignore": "忽略",
+      "sent": "已读回执已发送。",
+      "send_failed": "无法发送已读回执",
+      "mdn_subject": "已读：{subject}",
+      "mdn_body": "这是您发送给 {recipient} 的邮件的已读回执。\n\n注意：此回执仅表示邮件已在收件人的计算机上显示，并不保证收件人已阅读或理解邮件内容。"
+    },
     "no_email_selected": "未选择邮件",
     "no_email_description": "从列表中选择一封邮件以在此查看",
     "no_conversation_selected": "未选择会话",
@@ -538,6 +547,8 @@
     "undo_send": "撤销发送"
   },
   "email_composer": {
+    "read_receipt_on": "已请求已读回执（点击以关闭）",
+    "read_receipt_off": "请求已读回执",
     "new_message": "新邮件",
     "reply": "回复",
     "reply_all": "全部回复",
@@ -554,8 +565,8 @@
     "send": "发送",
     "cancel": "取消",
     "attach": "附件",
-    "attach_photos": "照片和视频",
-    "attach_files": "文件",
+    "attach_photos": "Photos & Videos",
+    "attach_files": "Files",
     "discard": "丢弃",
     "discard_draft_title": "丢弃草稿？",
     "discard_draft_confirm": "您有未保存的更改。确定要丢弃这封草稿吗？",
@@ -638,9 +649,7 @@
     "schedule_send_unsupported": "此账户不支持计划发送。",
     "schedule_send_cleanup_warning": "已创建计划发送，但清理草稿失败。",
     "send_delay_unsupported": "此账户不支持发送延迟。",
-    "send_delay_unsupported_confirm": "此账户不支持发送延迟。是否立即发送？",
-    "attach_photos": "Photos & Videos",
-    "attach_files": "Files"
+    "send_delay_unsupported_confirm": "此账户不支持发送延迟。是否立即发送？"
   },
   "confirm_dialog": {
     "confirm": "确认",
@@ -999,6 +1008,17 @@
       }
     },
     "email_behavior": {
+      "request_read_receipt": {
+        "label": "默认请求已读回执",
+        "description": "撰写新邮件时预先启用已读回执请求。"
+      },
+      "read_receipt_response": {
+        "label": "响应已读回执请求",
+        "description": "当收到的邮件请求已读回执时的处理方式。",
+        "ask": "每次询问",
+        "always": "始终发送",
+        "never": "从不发送"
+      },
       "title": "邮件行为",
       "description": "配置邮件的处理方式",
       "mark_read": {
@@ -1423,6 +1443,7 @@
       }
     },
     "folders": {
+      "role_memos": "备忘录",
       "title": "文件夹",
       "description": "管理邮件文件夹并分配邮箱角色",
       "folder_list": "您的文件夹",
@@ -1625,7 +1646,10 @@
       "actions": "操作",
       "add_action": "添加操作",
       "stop_processing": "停止处理后续规则",
+      "attachment_type_placeholder": "例如：pdf、doc、jpg",
+      "value_placeholder_multi": "值（多个用逗号分隔）",
       "condition_fields": {
+        "attachment": "附件",
         "from": "发件人",
         "to": "收件人",
         "cc": "抄送",
@@ -1635,6 +1659,8 @@
         "body": "正文"
       },
       "comparators": {
+        "has_any": "存在",
+        "has_type": "类型为",
         "contains": "包含",
         "not_contains": "不包含",
         "is": "等于",
@@ -3048,5 +3074,20 @@
       "manager": "管理员",
       "custom": "自定义"
     }
+  },
+  "quote_header": {
+    "reply_line": "在 {date}，{from} 写道：",
+    "forwarded_separator": "---------- 转发邮件 ----------",
+    "from_label": "发件人",
+    "date_label": "日期",
+    "subject_label": "主题"
+  },
+  "pwa_install": {
+    "title": "安装 {appName}",
+    "description": "安装我们的应用，以获得快速访问和离线支持。",
+    "not_now": "暂不",
+    "install": "安装",
+    "dont_remind": "不再提醒",
+    "dismiss_aria": "关闭安装提示"
   }
 }

stores/email-store.ts

@@ -133,7 +133,7 @@ interface EmailStore {
   loadMoreEmails: (client: IJMAPClient) => Promise<void>;
   fetchEmailContent: (client: IJMAPClient, emailId: string) => Promise<Email | null>;
   fetchQuota: (client: IJMAPClient) => Promise<void>;
-  sendEmail: (client: IJMAPClient, to: string[], subject: string, body: string, cc?: string[], bcc?: string[], identityId?: string, fromEmail?: string, draftId?: string, fromName?: string, htmlBody?: string, attachments?: Array<{ blobId: string; name: string; type: string; size: number; disposition?: 'attachment' | 'inline'; cid?: string }>, inReplyTo?: string[], references?: string[], delayedUntil?: string, envelopeMailFrom?: string) => Promise<SendEmailResult>;
+  sendEmail: (client: IJMAPClient, to: string[], subject: string, body: string, cc?: string[], bcc?: string[], identityId?: string, fromEmail?: string, draftId?: string, fromName?: string, htmlBody?: string, attachments?: Array<{ blobId: string; name: string; type: string; size: number; disposition?: 'attachment' | 'inline'; cid?: string }>, inReplyTo?: string[], references?: string[], delayedUntil?: string, envelopeMailFrom?: string, options?: { requestReadReceipt?: boolean }) => Promise<SendEmailResult>;
   sendRawEmail: (client: IJMAPClient, rawMimeBlob: Blob, identityId: string, delayedUntil?: string, envelopeRecipients?: string[]) => Promise<SendEmailResult>;
   deleteEmail: (client: IJMAPClient, emailId: string, forceDelete?: boolean) => Promise<void>;
   markAsRead: (client: IJMAPClient, emailId: string, read: boolean) => Promise<void>;
@@ -841,10 +841,10 @@ export const useEmailStore = create<EmailStore>((set, get) => ({
     }
   },
 
-  sendEmail: async (client, to, subject, body, cc, bcc, identityId, fromEmail, draftId, fromName, htmlBody, attachments, inReplyTo, references, delayedUntil, envelopeMailFrom) => {
+  sendEmail: async (client, to, subject, body, cc, bcc, identityId, fromEmail, draftId, fromName, htmlBody, attachments, inReplyTo, references, delayedUntil, envelopeMailFrom, options) => {
     set({ isLoading: true, error: null });
     try {
-      const result = await client.sendEmail(to, subject, body, cc, bcc, identityId, fromEmail, draftId, fromName, htmlBody, attachments, inReplyTo, references, delayedUntil, envelopeMailFrom);
+      const result = await client.sendEmail(to, subject, body, cc, bcc, identityId, fromEmail, draftId, fromName, htmlBody, attachments, inReplyTo, references, delayedUntil, envelopeMailFrom, options);
       // Refresh handled by UI layer for immediate feedback
       set({
         isLoading: false,

stores/plugin-store.ts

@@ -6,7 +6,8 @@ import { persist } from 'zustand/middleware';
 import type { InstalledPlugin, PluginStatus } from '@/lib/plugin-types';
 import { pluginStorage } from '@/lib/plugin-storage';
 import { extractPlugin } from '@/lib/plugin-validator';
-import { loadPlugin, deactivatePlugin, setPluginStoreAccessor, setupAutoDisable } from '@/lib/plugin-loader';
+import { loadPlugin, deactivatePlugin, setPluginStoreAccessor, setupAutoDisable, setSandboxLocale } from '@/lib/plugin-loader';
+import { useLocaleStore } from '@/stores/locale-store';
 import { removeAllPluginHooks } from '@/lib/plugin-hooks';
 import { requestConsent } from '@/lib/plugin-sandbox/consent';
 import { sha256Hex } from '@/lib/plugin-sandbox/bundle-integrity';
@@ -17,6 +18,8 @@ import { IMPLICIT_PERMISSIONS } from '@/lib/plugin-types';
 import type { Permission } from '@/lib/plugin-types';
 
 let pluginInitializationPromise: Promise<void> | null = null;
+// One-time guard so we attach the locale->sandbox subscription only once.
+let localeSubscribed = false;
 
 // ─── Store Interface ─────────────────────────────────────────
 
@@ -258,6 +261,17 @@ export const usePluginStore = create<PluginStoreState>()(
             setPluginStatus: get().setPluginStatus,
           });
           setupAutoDisable();
+          // Keep the sandbox locale in step with the app locale. Set it
+          // synchronously *before* activation so background instances get the
+          // right locale in their init payload (the bug: the only wiring lived
+          // in the dead activateAllPlugins() path, so the sandbox locale stayed
+          // 'en' forever and plugin i18n never localized). Subscribe once for
+          // later language switches; those affect plugins/slots loaded after.
+          setSandboxLocale(useLocaleStore.getState().locale);
+          if (!localeSubscribed) {
+            localeSubscribed = true;
+            useLocaleStore.subscribe((s) => setSandboxLocale(s.locale));
+          }
 
           // Sync server-managed plugins before loading
           await syncServerPlugins(get, set);
@@ -324,6 +338,33 @@ interface ServerPluginInfo {
   apiPostPaths?: string[];
   /** Per-user settings schema, captured from the manifest server-side. */
   settingsSchema?: InstalledPlugin['settingsSchema'];
+  /** Plugin-declared i18n tables (locale -> key -> string), from the manifest. */
+  locales?: InstalledPlugin['locales'];
+}
+
+/**
+ * Server-owned metadata, passed through verbatim on every sync. Centralised in
+ * ONE place so a newly added passthrough field can't be silently dropped at one
+ * of several copy sites - which is exactly what previously lost `settingsSchema`
+ * (hence the old "schema drift" special-case) and then `locales`. Excludes
+ * fields the client owns (id, type, enabled/status, settings, adminApproved).
+ */
+function serverMeta(sp: ServerPluginInfo) {
+  return {
+    name: sp.name,
+    version: sp.version,
+    author: sp.author,
+    description: sp.description,
+    permissions: sp.permissions,
+    entrypoint: sp.entrypoint,
+    managed: true as const,
+    forceEnabled: sp.forceEnabled,
+    bundleHash: sp.bundleHash,
+    httpOrigins: sp.httpOrigins,
+    apiPostPaths: sp.apiPostPaths,
+    settingsSchema: sp.settingsSchema,
+    locales: sp.locales,
+  };
 }
 
 const SERVER_MANAGED_KEY = 'server-managed-plugin-ids';
@@ -402,113 +443,57 @@ async function syncServerPlugins(
       const local = get().plugins.find(p => p.id === sp.id);
 
       if (!local) {
-        // New server plugin - download and install
+        // New server plugin - download bundle and install.
         const code = await downloadPluginBundle(sp.id, sp.bundleHash);
         if (!code) continue;
-
         await pluginStorage.saveCode(sp.id, code);
 
         const plugin: InstalledPlugin = {
           id: sp.id,
-          name: sp.name,
-          version: sp.version,
-          author: sp.author,
-          description: sp.description,
           type: sp.type as InstalledPlugin['type'],
-          permissions: sp.permissions,
-          entrypoint: sp.entrypoint,
           enabled: sp.forceEnabled,
           status: sp.forceEnabled ? 'enabled' : 'installed',
-          managed: true,
-          forceEnabled: sp.forceEnabled,
           adminApproved: true, // Server-managed plugins are always approved
           settings: {},
-          settingsSchema: sp.settingsSchema,
-          bundleHash: sp.bundleHash,
-          ...(sp.httpOrigins && sp.httpOrigins.length > 0
-            ? { httpOrigins: sp.httpOrigins }
-            : {}),
-          ...(sp.apiPostPaths && sp.apiPostPaths.length > 0
-            ? { apiPostPaths: sp.apiPostPaths }
-            : {}),
+          ...serverMeta(sp),
         };
+        set(state =>
+          state.plugins.some(p => p.id === sp.id)
+            ? {}
+            : { plugins: [...state.plugins, plugin] },
+        );
+        continue;
+      }
 
-        set(state => {
-          if (state.plugins.some(p => p.id === sp.id)) {
-            return {};
-          }
-          return { plugins: [...state.plugins, plugin] };
-        });
-      } else if (
+      // Existing plugin. Re-download the bundle only when the code actually
+      // changed, but ALWAYS re-derive server-owned metadata from one place
+      // (serverMeta) so no passthrough field is silently dropped on a
+      // metadata-only change. Only write when something differs, to avoid a
+      // needless persist/re-render on every sync.
+      const needsBundle =
         local.version !== sp.version ||
         // bundleHash mismatch covers re-uploads of the same version with new
-        // code. Falsy local hash (older installs that never carried one) also
-        // forces a refresh so we capture the hash on the next sync.
-        (sp.bundleHash && local.bundleHash !== sp.bundleHash)
-      ) {
-        // Version or content changed - re-download bundle
+        // code; a falsy local hash (older installs) also forces a refresh so
+        // we capture the hash on the next sync.
+        (!!sp.bundleHash && local.bundleHash !== sp.bundleHash);
+
+      if (needsBundle) {
         const code = await downloadPluginBundle(sp.id, sp.bundleHash);
         if (!code) continue;
-
         await pluginStorage.saveCode(sp.id, code);
+      }
 
+      // Force-enable in the same pass when the server flips it on, so the user
+      // doesn't need a second refresh for it to run.
+      const shouldAutoEnable = sp.forceEnabled && !local.enabled;
+      const next: InstalledPlugin = {
+        ...local,
+        ...serverMeta(sp),
+        ...(shouldAutoEnable ? { enabled: true, status: 'enabled' as const } : {}),
+      };
+      if (needsBundle || JSON.stringify(next) !== JSON.stringify(local)) {
         set(state => ({
-          plugins: state.plugins.map(p =>
-            p.id === sp.id
-              ? {
-                  ...p,
-                  name: sp.name,
-                  version: sp.version,
-                  author: sp.author,
-                  description: sp.description,
-                  permissions: sp.permissions,
-                  entrypoint: sp.entrypoint,
-                  managed: true,
-                  forceEnabled: sp.forceEnabled,
-                  bundleHash: sp.bundleHash,
-                  httpOrigins: sp.httpOrigins,
-                  apiPostPaths: sp.apiPostPaths,
-                  settingsSchema: sp.settingsSchema,
-                }
-              : p
-          ),
-        }));
-      } else if (local.managed !== true || local.forceEnabled !== sp.forceEnabled) {
-        // When forceEnabled flips on, enable the plugin in the same pass so
-        // the user doesn't need a second refresh for it to run.
-        const shouldAutoEnable = sp.forceEnabled && !local.enabled;
-        set(state => ({
-          plugins: state.plugins.map(p =>
-            p.id === sp.id
-              ? {
-                  ...p,
-                  managed: true,
-                  forceEnabled: sp.forceEnabled,
-                  settingsSchema: sp.settingsSchema,
-                  ...(shouldAutoEnable ? { enabled: true, status: 'enabled' as const } : {}),
-                }
-              : p
-          ),
-        }));
-      } else if (
-        JSON.stringify(local.settingsSchema ?? null) !== JSON.stringify(sp.settingsSchema ?? null)
-      ) {
-        // Schema drift: the bundle is current but the persisted plugin record
-        // pre-dates the server passing settingsSchema through, so the per-user
-        // settings UI was rendering empty. Patch the schema in place.
-        set(state => ({
-          plugins: state.plugins.map(p =>
-            p.id === sp.id ? { ...p, settingsSchema: sp.settingsSchema } : p
-          ),
-        }));
-      } else if (sp.forceEnabled && !local.enabled) {
-        // Force-enable if the server says so but client has it disabled
-        set(state => ({
-          plugins: state.plugins.map(p =>
-            p.id === sp.id
-              ? { ...p, enabled: true, status: 'enabled' as const, managed: true, forceEnabled: true }
-              : p
-          ),
+          plugins: state.plugins.map(p => (p.id === sp.id ? next : p)),
         }));
       }
     }

stores/settings-store.ts

@@ -31,6 +31,8 @@ export type ListDensity = Density;
 export type DeleteAction = 'trash' | 'trash-and-read' | 'permanent';
 export type ReplyMode = 'reply' | 'replyAll';
 export type SignaturePosition = 'above_quote' | 'below_quote';
+/** How to handle an incoming Disposition-Notification-To (read-receipt) request. */
+export type ReadReceiptResponse = 'ask' | 'always' | 'never';
 export type DateFormat = 'smart' | 'relative' | 'full';
 export type TimeFormat = '12h' | '24h';
 export type FirstDayOfWeek = 0 | 1; // 0 = Sunday, 1 = Monday
@@ -157,6 +159,8 @@ interface SettingsState {
   sendDelaySeconds: SendDelaySeconds;
   signaturePosition: SignaturePosition; // Position of the signature relative to quoted text in replies/forwards
   signatureSeparatorEnabled: boolean; // Prefix the signature with the RFC 3676 "-- " delimiter
+  requestReadReceiptDefault: boolean; // Pre-check "request read receipt" in the composer
+  readReceiptResponse: ReadReceiptResponse; // How to respond to incoming read-receipt requests
 
   // Privacy & Security
   sessionTimeout: number; // minutes (0 = never)
@@ -332,6 +336,8 @@ const DEFAULT_SETTINGS = {
   sendDelaySeconds: 0 as SendDelaySeconds,
   signaturePosition: 'below_quote' as SignaturePosition,
   signatureSeparatorEnabled: true,
+  requestReadReceiptDefault: false,
+  readReceiptResponse: 'ask' as ReadReceiptResponse,
 
   // Privacy & Security
   sessionTimeout: 0, // Never
@@ -526,6 +532,8 @@ export const useSettingsStore = create<SettingsState>()(
           sendDelaySeconds: state.sendDelaySeconds,
           signaturePosition: state.signaturePosition,
           signatureSeparatorEnabled: state.signatureSeparatorEnabled,
+          requestReadReceiptDefault: state.requestReadReceiptDefault,
+          readReceiptResponse: state.readReceiptResponse,
           sessionTimeout: state.sessionTimeout,
           emailNotificationsEnabled: state.emailNotificationsEnabled,
           emailNotificationSound: state.emailNotificationSound,