JMAP Webmail

A modern, privacy-focused webmail client built with Next.js and the JMAP protocol.

Built for Stalwart

This webmail client is designed to work seamlessly with Stalwart Mail Server - a modern, secure, and blazingly fast mail server written in Rust.

Why Stalwart?

• Modern Architecture: Built from the ground up with Rust for performance and safety
• JMAP-Native: First-class support for the JMAP protocol (not just IMAP/SMTP bolted on)
• Privacy-Focused: Self-hosted, no third-party dependencies, full control over your data
• Feature-Rich: Supports JMAP, IMAP, SMTP, ManageSieve, and more

Stalwart GitHub | Documentation

Features

Core Email Operations

• Read, compose, reply, reply-all, and forward emails
• Full HTML email rendering with security sanitization
• Attachment upload and download
• Draft auto-save with discard confirmation
• Email threading with Gmail-style inline expansion
• Mark as read/unread, star/unstar
• Archive and delete with configurable behavior
• Color tags/labels for email organization
• Advanced search with JMAP filter panel, search chips, and cross-mailbox queries
• Virtual scrolling for large email lists

User Interface

• Clean, minimalist three-pane layout
• Dark and light theme support
• Responsive design for mobile and desktop
• Keyboard shortcuts for power users
• Drag-and-drop email organization
• Right-click context menus
• Smooth animations and transitions
• Infinite scroll pagination

Real-time Updates

• Push notifications via JMAP EventSource
• Real-time unread counts
• Live email arrival notifications
• Connection status indicator

Identity Management

• Multiple sender identities with per-identity signatures
• Sub-addressing support (user+tag@domain.com) with tag suggestions
• Identity badges in email viewer and list

Address Book

• Contact management with search and filtering
• JMAP server sync (RFC 9553/9610) with local fallback
• Email autocomplete from contacts in composer
• Contact groups/lists with group expansion in composer
• vCard import/export (RFC 6350) with duplicate detection
• Bulk operations (multi-select, delete, group add, export)

Calendar

• JMAP Calendar integration (RFC 8984) with capability detection
• Month, week, day, and agenda views
• Event create, edit, and delete with recurrence rules and reminders
• Multi-day events spanning across days, column-based overlap layout
• Mini-calendar sidebar with calendar visibility toggles
• Locale-aware date formatting (respects user's language)
• Settings for first day of week, time format (12h/24h), and default view
• Drag-and-drop rescheduling (week/day time snap, month date move)
• iCalendar (.ics) file import with event preview and bulk create
• Real-time updates via JMAP push notifications
• Event notifications with client-side alert evaluation and toast display
• Configurable notification sound and enable/disable toggles
• Keyboard shortcuts: m/w/d/a (views), t (today), n (new event), arrows (navigate)

Email Filters

• Server-side email filtering with JMAP Sieve Scripts (RFC 9661)
• Visual rule builder with conditions (From, To, Subject, Size, Body, etc.) and actions (Move, Forward, Mark read, Star, Discard, Reject, etc.)
• Raw Sieve script editor for advanced users with syntax validation
• Auto-save on rule changes with rollback on failure
• Drag-and-drop rule reordering
• Reset opaque scripts back to visual builder
• Capability-gated (only shown when server supports Sieve)

Vacation Responder

• JMAP VacationResponse management with date range scheduling
• Dedicated settings tab with message configuration
• Sidebar indicator when vacation auto-reply is active

Security & Privacy

• External content blocked by default
• Trusted senders list for automatic image loading
• HTML sanitization with DOMPurify
• SPF/DKIM/DMARC status indicators
• No password storage (session-based auth)
• TOTP two-factor authentication support
• Shared folder support with proper permissions
• Newsletter unsubscribe support (RFC 2369)
• CSP headers and security headers (X-Content-Type-Options, X-Frame-Options, Referrer-Policy)

Internationalization

• 8 language support: English, French, Japanese, Spanish, Italian, German, Dutch, Portuguese
• Automatic browser language detection
• Persistent language preference

Deployment

• Docker support with multi-stage build and standalone output
• Runtime environment variables (no rebuild needed for config changes)
• Health check endpoint for container orchestration
• Structured server-side logging (text/JSON format)

Tech Stack

• Framework: Next.js 16 with App Router
• Language: TypeScript
• Styling: Tailwind CSS v4
• State Management: Zustand
• JMAP Client: jmap-jam
• i18n: next-intl
• Icons: Lucide React

Getting Started

Prerequisites

• Node.js 18+
• A JMAP-compatible mail server (we recommend Stalwart)

Installation

# Clone the repository
git clone https://github.com/root-fr/jmap-webmail.git
cd jmap-webmail

# Install dependencies
npm install

# Copy environment configuration
cp .env.example .env.local

Configuration

Edit .env.local with your settings:

# App name displayed in the UI
APP_NAME=My Webmail

# Your JMAP server URL (required)
JMAP_SERVER_URL=https://mail.example.com

Note: These are runtime environment variables, read at request time. This enables Docker deployments to be configured without rebuilding the image. Legacy NEXT_PUBLIC_* variables are still supported as fallbacks.

Development

# Start development server
npm run dev

# Type checking
npm run typecheck

# Linting
npm run lint

Production Build

# Build for production
npm run build

# Start production server
npm start

Docker

# Using docker-compose
cp .env.example .env.local
# Edit .env.local with your JMAP_SERVER_URL
docker compose up -d

# Or build manually
docker build -t jmap-webmail .
docker run -p 3000:3000 -e JMAP_SERVER_URL=https://mail.example.com jmap-webmail

Keyboard Shortcuts

Key	Action
j / k	Navigate between emails
Enter / o	Open selected email
Esc	Close viewer / deselect
c	Compose new email
r	Reply
R / a	Reply all
f	Forward
s	Toggle star
e	Archive
# / Delete	Delete
u	Mark as unread
/	Focus search
x	Expand/collapse thread
?	Show shortcuts help

Screenshots

Login	Inbox
Email Viewer	Compose
Dark Mode	Settings

Contributing

We welcome contributions! Please see CONTRIBUTING.md for guidelines.

Roadmap

See ROADMAP.md for planned features and development status.

Acknowledgments

• Stalwart Labs for creating an excellent JMAP mail server
• The JMAP working group for the protocol specification
• All contributors and users of this project

License

This project is licensed under the MIT License - see the LICENSE file for details.