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Features

Mail

  • Read, compose, reply, reply-all, and forward with a Tiptap rich text editor (inline images, drag-and-drop embedding)
  • Gmail-style threading with inline expansion and an optional conversation toggle
  • Unified mailbox view across all connected accounts
  • Draft auto-save with identity preservation
  • Attachment upload, download, and inline preview; forgotten-attachment warning
  • Full-text search with JMAP filter panel, search chips, wildcards, OR conditions, and cross-mailbox queries
  • Batch operations – multi-select, archive, delete, move, tag
  • Archive modes – direct, by year, or by month
  • Multi-tag support with color labels, reordering, and drag-and-drop assignment
  • Star/unstar with configurable mark-as-read delay
  • Virtual scrolling for large mailboxes
  • Quick reply, hover actions, sender avatars (favicon-based), and recipient popovers
  • Plain-text composer mode and Reply-To support
  • TNEF (winmail.dat) extraction and message/rfc822 unwrapping
  • Folder management with icon picker, subfolders, and sidebar counts
  • Print directly from the viewer
  • Browser history sync for back/forward navigation

Calendar

  • Month, week, day, and agenda views with a mini-calendar sidebar and task list
  • Drag-to-reschedule, click-drag creation, and edge-resize with 15-minute snap
  • Recurring events with scoped edit/delete (this / this and following / all)
  • iMIP invitations on create and update (RFC 5545 / 6047), organizer/attendee UI, and RSVP with trust assessment
  • Inline calendar invitations in the email viewer – auto-detect .ics, RSVP, import
  • iCalendar import with preview, bulk create, and UID deduplication
  • iCal / webcal subscriptions with editing and batch import
  • Auto-generated birthday calendar from contacts
  • Virtual locations (video conference URLs) as first-class event fields
  • Task management with due dates, priority, and completion status
  • Shared calendars with CalDAV discovery and multi-account home resolution
  • Week numbers, event hover preview, notifications with sound picker
  • Real-time sync via JMAP push

Contacts

  • JMAP sync (RFC 9553 / 9610) with local fallback
  • Multiple address books with drag-and-drop between books
  • Contact groups with member management
  • vCard import/export (RFC 6350) with duplicate detection
  • Trusted senders stored in a dedicated JMAP address book
  • Autocomplete in the composer (To / Cc / Bcc)

Filters & Templates

  • Server-side filters via JMAP Sieve Scripts (RFC 9661)
  • Visual rule builder with expanded view; conditions (From, To, Subject, Size, Body…) and actions (Move, Forward, Star, Discard…)
  • Preserves rules authored in other clients
  • Raw Sieve editor with syntax validation
  • Vacation responder with date range scheduling
  • Reusable email templates with placeholder auto-fill ({{recipientName}}, {{date}}, …)

Files

  • JMAP FileNode browser (Stalwart native cloud storage)
  • Streamed WebDAV PUT upload and folder upload with progress tracking
  • Dynamic upload limits based on server configuration
  • Grid and list views with sorting by name, size, or date
  • Previews for images, text, audio, and video
  • Clipboard operations (cut, copy, paste, duplicate), favorites, and recent files

Security & Privacy

  • External content blocked by default, with a trusted senders list
  • HTML sanitization via DOMPurify
  • S/MIME – manage certificates, sign, encrypt, decrypt, and verify; legacy 3DES / PBE support; per-account key isolation
  • SPF / DKIM / DMARC status indicators
  • OAuth2 / OIDC with PKCE (Keycloak, Authentik, or built-in), OAuth-only mode, OAuth app passwords, and non-interactive SSO for embedded deployments
  • TOTP two-factor authentication
  • Account security panel for password and 2FA management via the Stalwart admin API
  • Optional "Remember me" via AES-256-GCM encrypted httpOnly cookie
  • Enforced CSP with per-request nonce, SSRF redirect validation, PDF iframe sandbox, and IP spoofing prevention
  • Plugin hardening with dangerous-pattern detection and admin approval
  • Newsletter unsubscribe (RFC 2369)

Interface

  • Three-pane layout with resizable columns
  • Dark and light themes with intelligent email color transformation
  • Responsive desktop, tablet, and mobile layouts
  • Full keyboard navigation
  • Drag-and-drop email organization and tag assignment
  • Interactive guided tour for new users
  • Right-click context menus, toast notifications with undo
  • Customizable toolbar position, favicon, and login branding
  • Pinnable sidebar apps with drag-and-drop reordering
  • Encrypted settings sync across devices
  • Storage quota display
  • WCAG AA contrast, reduced-motion support, focus trap, and screen reader live regions

Internationalization

15 languages: English · Français · 日本語 · Español · Italiano · Deutsch · Nederlands · Português · Русский · Türkçe · 한국어 · Polski · Latviešu · 简体中文 · Українська

Automatic browser detection with persistent preference. Configurable locale URL prefix via NEXT_PUBLIC_LOCALE_PREFIX.

Identity & Multi-Account

  • Up to 5 simultaneous accounts with instant switching and per-account session persistence
  • Account switcher with connection status and default account selection
  • Multiple sender identities with per-identity signatures, automatic sync, and badges in viewer/list
  • Sub-addressing (user+tag@domain.com) with contextual tag suggestions
  • Shared folders across accounts
  • Optional custom JMAP endpoints on the login form (ALLOW_CUSTOM_JMAP_ENDPOINT)

Admin & Extensibility

  • Stalwart admin dashboard with dedicated policy sections
  • Plugin system – schema-driven config UI, render and intercept hooks, onAvatarResolve and i18n APIs, calendar event slots, and managed policy enforcement
  • Themes – upload, enforce, and manage admin-controlled themes as ZIP bundles
  • Extension marketplace – browse and install plugins and themes from a configurable directory (EXTENSION_DIRECTORY_URL)
  • Bundled plugins including Jitsi Meet calendar integration

Operations

  • Progressive Web App with service worker, install prompt, and dynamic manifest
  • Automatic update check with server-side logging of new releases
  • Structured logging (text or json) with category-based levels
  • Release (main) and development (dev) Docker images on GHCR
  • Demo mode with fixture data – no mail server required