1.7.0 (2026-05-21)

New: Pro mode (experimental)

Opt-in tabbed multi-pane interface for power users. Open multiple mail, calendar, contacts, and file views side-by-side, drag tabs to reorder or split panes at the edges, and work across all logged-in accounts in one shell, cross-account email moves, a unified inbox with search, account-split calendar/contacts/files sidebars, and a per-account "From" dropdown in the composer. Enable from Settings → Appearance; the proInterface preference is per-device and not synced.

Pro mode is experimental and we need your feedback to shape it. If something feels off, breaks, or is missing, please don't hesitate to open an issue or start a discussion on GitHub!

Breaking Changes

• Plugins: Plugins now run inside a null-origin iframe sandbox and talk to the host over a postMessage RPC bridge. The in-process plugin runtime is gone; the bundled in-tree plugins have been migrated. Third-party plugins built against the old in-process API need to be ported to the sandboxed runtime.
• Plugins: Server-managed bundles must be Ed25519-signed by the host and approved by an admin before they load. The host public key is served from /api/plugin-signing-pubkey and each bundle response carries the signature in the X-Bundle-Signature header. User-uploaded bundles still load unsigned, but managed marketplace and dev-folder bundles do not.
• Plugins: bundleHash is now a full SHA-256 over the bundle. Legacy short hashes are migrated on first load; any out-of-band tooling that pinned the old hash format needs to be updated.

Features

• Pro: Tabbed shell with drag-to-reorder, drag-to-edge to split, side-by-side panes, and pane-aware responsive layout with a scoped sidebar overlay
• Pro: Auto-redirect to the Pro shell when Pro mode is on; proInterface is kept per-device instead of syncing
• Pro: Multi-account mail sidebar with client routing and a per-account mailbox cache
• Pro: Unified mailbox always visible, with full-text search
• Pro: Cross-account email moves
• Pro: Multi-account calendar sidebar split into owned vs shared per account
• Pro: Multi-account contacts and a cross-account file picker
• Pro: Composer From dropdown grouped by account
• Plugins: Per-plugin admin approval workflow with Ed25519 bundle signing verified on load
• Plugins: Marketplace update flow for installed plugins and themes
• Setup: Allow the setup wizard over plain HTTP with a dismissable warning gate
• Setup: Warn when the JMAP URL points at a local-only host
• Account: List and reorder logged-in accounts from settings (#282)
• Mail: Mobile handoff page with JMAP authentication verification for cross-device OAuth
• Mail: Pluggable reply/forward quote header (#295)
• Calendar: Support multiple flexible event reminders (#170)
• Admin: Expose PWA, app identity, and extension directory keys in the JSON config (#312)
• Admin: Surface OAuth scope settings and wire up orphaned admin policy gates

Security

• Plugins: Pin parent origin in the iframe bridge to block cross-frame postMessage
• Plugins: Ignore plugin-supplied target in ui.openExternalUrl to block host-frame hijack
• Plugins: Validate plugin/theme id in marketplace install to block path traversal
• Plugins: Prevent plugin config from leaking to non-admin users
• Admin: Gate admin routes against cross-origin CSRF
• Auth: Bind Stalwart auth context to the credential, not the cookie-claimed username
• Auth: Validate OAuth discovery endpoints against SSRF
• Mail: Tighten HTML sanitization at plain-text email, signature, and i18n render sites
• Mail: Block script-bearing MIME types from inline attachment preview
• Mail: Escape print-window fields and re-sanitize body to block XSS
• S/MIME: Stop persisting passphrases in sessionStorage
• API: Correct regex for valid API POST path validation

Fixes

• Mail: Serialize draft autosave with send to stop replies stalling in Drafts (#303)
• Mail: Omit empty cc/bcc from Email/set so the server does not emit a bare Cc: header (#301)
• Mobile: Allow adding contacts from the mail recipient popover (#306)
• Mobile: Prevent dual-scroll and use full width for mail content
• Mobile: OAuth handoff flow
• Calendar: Scope iCal subscriptions per JMAP account; fix refresh and clear
• Calendar: iCal subscription refresh, rollback, and URL normalization
• Calendar: Show avatars in the calendar/address book sharing menu
• Contacts: Normalize malformed contact photo data URIs (#307)
• Identity: Clear identity signature fields when emptied
• Identity: Show size cap on identity signature fields
• Identity: Allow table-based layouts in the HTML signature sanitizer
• Plugins: Load globals.css and Geist font in the plugin sandbox iframe
• Plugins: Sync plugin slot iframe height with reported content height
• Plugins: Use plugin slot offer snapshots for useSyncExternalStore
• Plugins: Trust the directory version on marketplace install and update
• Filters: Prevent duplication of Bulwark rules with literal braces in values
• Setup: Defer setup wizard HTTP detection to avoid hydration mismatch
• Routing: Anchor unmatched URLs into main so 404 renders
• Routing: Respect server-resolved locale on first visit (#309)
• Routing: Split app into (main)/(sandbox) route groups so the plugin iframe hydrates properly
• Files: Stop parent directory navigation from jumping to root
• Build: Stop pulling node:dns into the client bundle via OAuth discovery
• UI: Toggle recipient popover when clicking the name again
• UI: Remove white halo around photo avatars

i18n

• Add missing translation keys across 16 locales