Mailspring ทุกเวอร์ชันและเวอร์ชันเก่า

1.26.2 (10/22/2026)
This is a security patch release. Eight eMudhra intermediate certificates had their private keys compromised, so an attacker holding one could impersonate any mail server or website. (https://emudhra.we-have-a-problem.com/)
The previous release (1.26.1) updated Electron, and this release ensures that Mailspring's sync engine delegates trust decisions to the system certificate chain on every platform and for every connection (IMAP, SMTP, Caldav, etc). MacOS and Windows invalidated the eMudhra certificates by adding them to a separate "distrust" policy store, and this release ensures that Mailspring consults that list and well as the certificate trust chain when opening secure connections.
Bug Fixes:
- Fixed emails that declare a dark color scheme turning the message background black. (#2988)
- Fixed the Back and Close buttons in account setup not responding to clicks.
- The MCP server's reply_to_thread tool now loads the message body before quoting it.
- On macOS, fixed the Darkside theme's window controls sticking to the top of the window. (#2984) Thanks @AlexandreAgrn!
- Fixed calendar and contacts sync leaving a network connection open after every request, which piled up hundreds of open sockets per account over time. Thanks @Alintya.

This is a security patch release. It updates Electron to 44.9.1, which distrusts eight eMudhra intermediate certificates whose private keys were compromised. An attacker holding one of those keys could impersonate any mail server or website. (https://emudhra.we-have-a-problem.com/)
Security:
- Updated Electron to 44.9.1 to block the compromised eMudhra intermediate certificates.
- On Linux, tray icons are converted with ImageMagick without going through a shell. (#2934)
Bug Fixes:
- Fixed Mailspring failing to start when the interface language is set to Luxembourgish. (#2954) Thanks @brhellman!
- Fixed a composer crash when a list item has no list around it. (#2813)
- Sending a draft now retries the draft lookup once before reporting "draft not found". (#2848)
- On Wayland, Mailspring now restores the saved window size. (#2961) Thanks @shanelord01!
- An empty key list in keymap.json now unbinds a command. (#2950) Thanks @brhellman!
Localization:
- Updated German translations. (#2976) Thanks @Alintya!
Developer:
- Account-test errors from the sync engine are now reported to Sentry as separate issues. (#2843)

1.26.0 (10/1/2026)
This is a major sync reliability release - The sync engine now tracks every folder a message lives in, rather than forcing each message into a single folder. This permanently fixes mail "flickering" between folders or disappearing from the Inbox when the same message exists in two places — a long-standing issue for iCloud users, self-addressed mail that lands in both Inbox and Sent, Exchange's duplicate Sent copies, and ProtonMail labels. (#2891) This refactor was enabled by a huge new suite of automated mailsync tests that run against real Dovecot, Cyrus in Docker and fake problematic IMAP servers.
Features:
- Folder and unread counts left wrong by previous versions are repaired automatically on upgrade. Thanks @dansleboby!
- Calendars now refresh every 15 minutes instead of every 45, so invitations accepted on another device or meetings moved by the organizer show up sooner. Contacts sync slightly less often to conserve Google API quota. Thanks @brhellman!
- After an event is saved or deleted, Mailspring re-reads the calendar from the server so the event reflects what the server actually stored. (#2915) Thanks @brhellman!
- Calendars deleted or unshared on the server are now removed from Mailspring along with their events. Thanks @brhellman!
- Mailspring now records whether each calendar is your own or shared with you, so RSVPs are never written onto someone else's calendar. (#2916) Thanks @brhellman!
- Day and week calendar views now draw events with the same chip style as the month view, and selected events fill with the calendar's own color. (#2895) Thanks @manilabui!
Security:
- Links in print preview, quick-preview and "show original" windows now open in your browser instead of loading the remote page in the window.
- Links from auxiliary windows only open in your browser after a real click or keypress, so a meta refresh in a message can no longer open a page on its own.
- "Show All" on a clipped message now sanitizes the message body and blocks remote images like the reading pane.
- Replying, forwarding and sending no longer fetch remote images referenced by the message when automatic image loading is off. Opening an event's notes no longer fetches images referenced by its description, which could tell the sender you opened the invitation. (#2901) Thanks @brhellman!
- A malicious event UID can no longer cause the sync engine to write outside the calendar collection on the CalDAV server. Thanks @brhellman!
Bug Fixes:
- Fixed duplicate Sent copies appearing on Exchange Online, Gmail, Yahoo and Zoho, which file their own copy of sent mail.
- On servers without IMAP MOVE, moving a message no longer permanently erases other messages another client had only marked for deletion (e.g. Outlook's "mark for deletion" mode).
- Fixed several provider quirks: folder roles detected by name and \Archive support, servers reporting UIDNEXT 0, Coremail/NetEase servers that require an ID command, and servers that refuse LIST being treated as missing folders.
- Fixed mail rules not applying to self-addressed messages whose Inbox copy arrived after the Sent copy.
- Fixed the Unread view's recently-read threads leaking across views. (#2905) Thanks @dansleboby!
- Fixed Gmail messages losing text the sender placed inside the signature block when there was no quoted text. (#2902) Thanks @dansleboby!
- On Linux, fixed two title bars appearing on KDE and GNOME for users who never chose a menubar style. (#2903) Thanks @dansleboby!
- Fixed blank lines appearing in the inline reply composer. (#2896) Thanks @arnonuem!
- Fixed adding some Google Workspace and Office 365 accounts by always using the provider's servers for OAuth accounts. (#2907) Thanks @Jorl17!
- Fixed the Send button silently doing nothing when a draft's From address matches no account or alias; Mailspring now explains the problem. (#2910)
- Carriage returns are stripped from text dropped into the composer. (#2908)
- Fixed Google contacts with a birthday but no date

1.25.0 (9/19/2026)
Features:
- The Activity panel has been redesigned around three tabs: a new Feed tab lists every open and click with search, filtering, grouping by recipient or message, collapsing of repeated events and CSV export; a new Engagement tab ranks your recipients by how much they open and click your mail; and Reports has a new design with more charts.
- Added a "Go to Unread" navigation command (g u in the Gmail shortcut set), listed under View in the menu bar and rebindable from Preferences > Shortcuts.
- On macOS, the base theme now matches the macOS 27 toolbar and window styling.
Security:
This version includes several patches for security vulnerabilities and is recommended for all users. Thanks 홍서연 at ENKI WhiteHat for detailed investigation and reporting.
Bug Fixes:
- Fixed initial sync silently dropping messages on servers that advertise CONDSTORE and QRESYNC (FastMail, Dovecot, Zoho and others). Only the first 1024 messages of each 5000-message chunk were ingested.
- Fixed QRESYNC VANISHED handling that could unlink an entire folder's messages or drop expunges permanently on CONDSTORE+QRESYNC servers.
- Fixed a crash loop when an IMAP server or gateway (DavMail, Proton Bridge, Zoho) lists the same mailbox twice.
- Fixed Inbox and Sent appearing empty, with messages flickering between folders, on non-Gmail accounts that expose an \All mailbox. Messages that exist in both Inbox and Sent now consistently resolve to one folder.
- Fixed SMTP connections failing on servers that enforce RFC 5321's requirement that EHLO/HELO carry a fully qualified domain name or address literal.
- Fixed a sync-engine crash on launch when two accounts started contact sync in the same second and generated identical contact IDs. Random IDs are now seeded from the OS entropy source.
- Fixed malformed OAuth token responses crashing the sync engine, and a task with a null JSON field wedging it.
- Fixed Proton accounts losing their container folder, which placed Mailspring's helper folders (Snoozed) in the wrong place. proton.me addresses are now recognized, and Thunderbird autoconfig no longer overrides Mailspring's provider settings. (#2886)
- Fixed adding a Gmail or Office 365 account while offline reporting "Unable to connect to the server / port you provided" instead of an offline error. (#2887)
- Fixed the print window rendering inverted when the dark email render mode is enabled.
- Fixed deleting a single moved occurrence of a recurring event deleting the entire series from the server. (#2866) Thanks @brhellman!
- Fixed editing any field of a recurring event resetting its recurrence rule, so a fortnightly meeting became weekly and RDATE-only series lost their dates. (#2868) Thanks @brhellman!
- Fixed moving a recurring series leaving its EXDATEs behind, so every cancelled occurrence came back on every guest's calendar. (#2867) Thanks @brhellman!
- Fixed events with an IANA TZID whose VTIMEZONE the CalDAV server omitted (RFC 7809) reading as floating local time. (#2877) Thanks @brhellman!
- Calendar edits now write DTSTAMP in UTC as required by RFC 5545. (#2873) Thanks @brhellman!
- Fixed the calendar toolbar overlapping the date below ~800px wide, and day headings drifting from their columns. (#2870) Thanks @brhellman!
- The event card and editor now scroll when they outgrow the window, so Save and Cancel are always reachable. (#2874, #2878) Thanks @brhellman!
- Fixed a focused calendar event reopening its card and scrolling the grid on every re-render and view switch. (#2872) Thanks @brhellman! (#2882) Thanks @manilabui!
- Fixed the time tooltip never appearing while dragging a calendar event. (#2871) Thanks @brhellman!
- Fixed an invitation's date rendering in the same red as the conflict warning; the location is now a clickable link. (#2869) Thanks @brhellman!
Improvements:
- Knowledge base links throughout the app now point to the new documentation URLs.
Developer:
- The Windows build now fails if any shipped PE binary lacks 

On Linux, Mailspring 1.24.1 fixed accounts being lost after upgrading when the KWallet secret name changed. Mailspring now falls back to the previous secret storage key and re-saves credentials. (#2864) Thanks @LinusDierheimer!
Features:
- Added "Mark All as Read" to the folder context menu, and an option to show unread counts for all folders. Thanks @AnsCodeLab!
- New drafts in a unified inbox now default to the account of the focused thread. Thanks @AnsCodeLab!
- Added a MessageActionMenuItem extension point so plugins can add items to the message "..." menu. Thanks @AnsCodeLab!
Bug Fixes:
- Fixed mail rules breaking when a folder's ID changed right after it was created. Rules now match folders by name when the match is unambiguous.
- Fixed the sidebar not switching from "Drafts" to "Activity" and other perspectives with the same layout.
- Fixed reminders created in the draft UI missing the last reply timestamp, so they never fired.
- Uploading a new signature image no longer overwrites the previous image on Mailspring's servers. Previously, replacing a signature image changed the image in emails you had already sent, and teams sharing a Mailspring ID could overwrite each other's default signature images.
- On Windows, composer and thread popout windows no longer show a second title bar beneath the native one; press Alt in those windows to show the menu bar. Thanks @ejbiker93ss!
- On Windows, the system tray icon is no longer blurry at 125% / 150% and other fractional display scales. Tray icons now ship as multi-size .ico files so Windows can pick an exact-match frame instead of stretching the 16px image.
- Fixed popout windows sometimes opening with the wrong toolbar when a hot window is assigned a window type. Thanks @ejbiker93ss!
- Fixed link and open tracking being lost when moving a draft between accounts.
- When attaching multiple files to a draft, the file order is now preserved.
- Pasting from Excel or OpenOffice now prefers the HTML clipboard content, and pasting several files at once attaches all of them, not just the first.
- Pasted JPEG, GIF, BMP, and WebP clipboard images are now recognized so they stay inline in the composer. Thanks @AnsCodeLab!
- Fixed some hardcoded colors in package stylesheets that did not follow the active theme.
Improvements:
- Emails with an explicit black text color (common in iCloud and Apple Mail signatures) are now shown white on dark background in dark mode, instead of a bright white background. (#2850)
- The folder context menu is now grouped with separators.
- On Windows, keyboard shortcuts are now shown with Ctrl / Alt / Shift instead of mod in the preferences.
Developer:
- The Claude Desktop MCP integration now uses a stdio bridge built into Mailspring instead of relying on npx.
- --spec-directory now resolves relative paths and fails fast when the directory does not exist.

1.24.0 (9/12/2026)
Note: The Flatpak version of Mailspring now uses Portal for secret storage, and you may be prompted to re-authenticate accounts after upgrading.
Note: Mailspring now requires macOS 13 (Ventura) or later, because Chromium has dropped support for macOS 12. Windows and Linux system requirements are unchanged.
Features:
- Added support for dragging threads into the composer to attach them as .eml files. (#2800)
- Added subject line support to email templates. (#2794)
- In the calendar, dragging an event now converts between all-day and timed. (#2819, #2812) Thanks @manilabui!
- Added an MCP get_attachment tool so local agents can view mail attachments. (#2807) Thanks @ahmedwalid05!
- On Windows, Mailspring now recovers from GPU-related renderer crashes that happen before the window loads by relaunching with hardware acceleration disabled. Thanks @ejbiker93ss!
Bug Fixes:
- Mailspring now falls back to legacy TLS settings when the handshake is rejected, and surfaces a suggestion when it does. (#119)
- Fixed crash safety, XML escaping, and log hygiene issues in the sync engine. (#122) Thanks @brhellman!
- Fixed synchronization with NetEase IMAP servers. (#121) Thanks @aixia715!
- Fixed recurring meetings whose series started years ago not appearing in the calendar. (#2845) Thanks @brhellman!
- On Linux, EROFS, EIO, ENOSPC, and EBADF are now swallowed alongside EPIPE in the stdout/stderr error handler. (#2789)
- Plain text messages are no longer inverted in dark mode, causing black-on-dark-gray text.
- Messages with stylesheets in the HTML <head> region now render with the styles intact.- Fixed a crash in the thread list context menu for threads with no participants. (#2839)
- Fixed a composer crash when removing a link mark with no active mark present. (#2802)
- Fixed a composer crash when applying a signature to an empty document. (#2804)
- Fixed a composer crash when backspacing near an unpaired UTF-16 surrogate. (#2808)
- Fixed a composer crash from an unset Slate selection point. (#2787)
- Fixed a crash when the custom-fonts plugin activated during boot. (#2785)
- Fixed a ChangeLabelsTask assertion failure when removing search results. (#2816)
- Fixed a TaskQueue crash when queries loaded out of order. (#2786)
- Fixed an uncaught "Unknown button clicked" crash in the config load-error dialog. (#2798)
- Fixed all-day events losing or gaining a day across edit, drag, and recurring paths, including near DST transitions. (#2799, #2805, #2806, #2810) Thanks @manilabui!
- Fixed resizing recurring events when applying the change to all events. (#2814) Thanks @manilabui!
- Fixed calendar deletion and blocked edits on read-only calendars and past events. (#2797) Thanks @manilabui!
- Fixed pasted text colors and line spacing on Windows. (#2796) Thanks @Mylosis!
- Fixed scrollbars appearing in the inbox-zero animation. (#2821) Thanks @m-salman-afzal!
- Fixed timed calendar events at midnight and across DST day boundaries rendering in the wrong day column or not at all. (#2847) Thanks @manilabui!
- Fixed timed calendar events sitting off their gridlines on DST days. (#2852) Thanks @manilabui!
- Fixed a timed event losing its time of day when its edge was dragged in month view. (#2858) Thanks @brhellman!
- Fixed the calendar view jumping when an event was selected for the first time. (#2854) Thanks @brhellman!
- Fixed the day/week calendar grid not scrolling to the end of the day in short windows. (#2851) Thanks @manilabui!
- Fixed every calendar invitee being underlined as a malformed address. (#2844) Thanks @brhellman!
- Fixed "Refresh Calendars" not actually syncing calendars. (#2853) Thanks @manilabui!
- Fixed a TypeError when creating or editing calendar events with an organizer or attendees. Thanks @ejbiker93ss!
- The calendar now syncs immediately after you RSVP to an invitation. Thanks @ejbiker93ss!
- Fixed the mini month view's today marker not advancing past midnight. Thanks @ejbiker93ss!
- Fixed Outlook-style rea

1.23.0 (7/19/2026)
Features:
- Added Office 365 shared mailbox support. (#2763) Thanks @Kevin-Hamilton!
- Added the ability to export folders to mbox files. (#2765) Thanks @Kevin-Hamilton!
- Added an option to count unread messages across all accounts. (#2779) Thanks @WebDevBar!
- Added a toggle for email render mode. (#2737) Thanks @AidanWarner97!
- Added an MCP server (off by default) that lets local agents interact with mail.
- On Linux, added a taskbar unread badge for KDE and other non-Unity desktops. (#2756) Thanks @WebDevBar!
Bug Fixes:
- Fixed a composer crash on quoted emails with inline images. (#2776)
- Fixed a composer crash when grammar-check decorations apply mid-composition. (#2775)
- Fixed missing Slate attributes on the IMAGE_TYPE fallback node. (#2774)
- Fixed a composer cut crash and suppressed Sentry noise from third-party plugins. (#2755)
- Fixed a crash when dragging threads to the sidebar after a thread is deleted. (#2760)
- Fixed a crash in EventRSVPTask when attendee ICS data goes stale. (#2770)
- Fixed a crash in the translation plugin when the iframe contentDocument is not yet loaded. (#2752)
- Fixed an onboarding crash when back-navigation empties the page stack. (#2750)
- Fixed navigator.clipboard.writeText in @electron/remote MenuItem handlers. (#2754)
- Fixed an ERR_FILE_NOT_FOUND crash in Show Original when the RFC822 fetch fails. (#2772)
- Fixed null crashes in SendDraftTask, thread-sharing, and send-and-archive. (#2757)
- Fixed a null crash in three IPC handlers when BrowserWindow.fromWebContents() returns null. (#2758)
- Fixed cancellation of GetManyRFC2822Task (folder export). (#118) Thanks @Kevin-Hamilton!
- Fixed handling of XDG paths. (#2761) Thanks @LinusDierheimer!
- On Linux, fixed an EPIPE crash loop in the uncaughtException handler. (#2769)
- On Linux, send org.freedesktop.DBus.Hello before emitting the badge signal. (#2778) Thanks @WebDevBar!
- Stopped startup after a fatal config.json load failure. (#2764)
- Guarded nativeTheme remote object access in SystemTrayIconStore. (#2753)
- Guarded grammar check so it no longer emits warnings when logged out.
Improvements:
- Added a macOS 27 icon variant.
- Reduced Sentry noise: expected IMAP/SMTP auth and connection failures are no longer reported. (#2762)
- Reduced Sentry noise from OAuth SSL failures and improved the mailsync crash message. (#2771)
- Downgraded the unknown-feature warning from an error report to a console warning. (#2759)
- Wrapped unhandled fetch errors in APIError in makeRequest. (#2766)
- Fixed an uncaught 'error' event crash in MailsyncProcess.sync(). (#2773)
- Fixed an unhandled rejection in IdentityStore background polling. (#2768)
Developer:
- Upgraded @electron/packager to prevent build hangs on newer Node.js versions. (#2767) Thanks @wrench-exile-legacy!
- Get the desktop name dynamically from package.json and stop hardcoding Mailspring.desktop. (#2748, #2777) Thanks @LinusDierheimer!
- Use a template var as the icon value in Mailspring.desktop. (#2747) Thanks @LinusDierheimer!
- Added branding colors to appdata.xml. (#2751) Thanks @LinusDierheimer!
- Fall back to ad-hoc signing in the copy-to-app build phase. (#117) Thanks @Kevin-Hamilton!

Features:
- Added the ability to choose which themes apply in automatic light/dark mode. (#2732) Thanks @Jayphen!
Bug Fixes:
- Fixed null crash when clicking "Send now" on undo-send toast after the message had already been sent. (#2738)
- Fixed two null-access crashes reported in Sentry (MAILSPRING-CLIENT-1G, MAILSPRING-CLIENT-18, MAILSPRING-CLIENT-2V). (#2740)
- Fixed two Sentry crashes: null account in preferences and null window in app menu IPC. (#2741)
- Fixed crash when archiving from search with label-based archive categories. (#2743)
- Fixed null crash when removing threads with unsynced trash/archive category. (#2736)
- Fixed Outlook account setup. (#2735) Thanks @Suchiman!
- Fixed Windows print crash caused by invalid file URL. (#2733)
- Fixed TOCTOU null-reference crash in draft body setter (MAILSPRING-CLIENT-S). (#2728)
- Fixed DefaultClientHelperMac passing boolean to error callback, causing false Sentry reports. (#2731)
- Fixed AttributeDateTime.fromJSON treating 0/falsy values as missing. (#2730)
- Fixed quickpreview CSP clobbering the default session's app-wide CSP. (#2744) Thanks @dansleboby!
- Fixed QuerySubscription._fetchRange contiguity check using actual result length. (#2734)
- On Windows, fixed EPERM crash when forking background query agent. (#2745)
Improvements:
- Improved Microsoft OAuth: better email resolution and suppressed no-mailbox errors from Sentry. (#2746)
- Added diagnostics around "draft not found" error on send and cleaned up waiting queues. (#2727)
- Moved payment flow out of modal to launch on the web for newer Stripe integration.
- Richer exceptions when account has no from address or when label is provided to ChangeFolderTask.
- Draft reminders now use thread: metadata prefix so sync engine promotes them to thread on send. (#2729)
- Sync engine now forwards identity-level refresh events from delta stream. (mailsync#115)

Performance:
- Optimized search regex compilation in category and label pickers. (#2715)
- Improved sync engine performance by reducing unnecessary SQLite writes and moving parsing outside transactions.
Bug Fixes:
- Improved theme support in calendar
- Fixed dark mode email bodies not reflecting the system tint color.
- Fixed activeMarks access errors in the composer editor. (#2714)
- Fixed thread list scroll indicator not sliding through time when dragging the scroll handle. (#2716)
- Fixed contains error when parentFilter receives a non-Element node. (#2712)
- Fixed secrets potentially appearing in the connection error detail modal. (#2717)
- Fixed package name validation rejecting names with uppercase letters. (#2718)
- Fixed sync engine crash during many-account sync by increasing SQLite busy timeout.
- Fixed message importance headers not normalized for compatibility with some providers. (mailsync#113)
- Improved error logging for empty or malformed error objects. (#2713)
Developer:
- Upgraded Electron from 41.5.0 to 41.6.1.
- Upgraded React and React DOM to v17. (#2725)
- Upgraded react-transition-group from 1.2 to 4.4.5.
- Replaced deprecated componentWillMount with componentDidMount. (#2724)
- Replaced legacy context API with React Context. (#2722, #2723)
- Refactored class components to functional components with React.memo. (#2720)
- Removed PropTypes, replaced with TypeScript types. (#2710)
- Added missing TypeScript types to function declarations across many files.
- Renamed remaining package spec directories to specs, converted JSX to TSX. (#2711)
- Added Playwright tests for composer interactions.
- Fixed lint CI step that was performing fixes instead of validation. (#2719)
- Removed unused CircleCI configuration.
- Set C++ standard to C++17 across all platforms. (mailsync#114)
- Various CMake and build improvements for mailsync. (mailsync#108, mailsync#109, mailsync#110, mailsync#111, mailsync#112) Thanks @LinusDierheimer!

Features:
- Added Reply-To field to the composer header, allowing you to specify a different reply address when composing messages. (#2691) Thanks @Argjend12345!
- Added bulk RFC2822 message export functionality to the sync engine. (#107)
Bug Fixes:
- Fixed HTTP/2 framing errors that could crash the sync engine during metadata streaming. (#103)
- Prevented global keyboard shortcuts from firing when focus is in the composer. (#2693)
- Strictly validate accent color hex values from system preferences to prevent errors. (#2692)
Claude Security Audit:
- Tightened validation to prevent file:// URIs in email content. (#2699)
- Limited path traversal in protocol handler. (#2700)
- Added allowlist validation for IPC window and webcontents methods. (#2701)
- Improved HTML sanitization in the composer when pasting content. (#2702)
- mailto links no longer support the ?attach= query parameter. (#2703)
- Improved attachment name sanitization for security and compatibility. (#2705)
- Improved email sanitization to block CSS @import tracking vectors. (#2706)
- Added package name validation to prevent path traversal attacks. (#2698)
- Added URL validation to the autoupdate handler. (#2697)
- Show a notice about plugin trust when installing third-party plugins.
Improvements:
- When a detailed error log is available during OAuth sign-in, it is now displayed to help with troubleshooting.
- Used exec in mailsync wrapper script for direct signal delivery. (#105)
Developer:
- Migrated build system from Grunt to a standalone Node.js script. (#2704)
- Added option to skip installer creation in the build script. (#2707) Thanks @LinusDierheimer!
- Dropped .map files from distribution packages. (#2686) Thanks @ReillyBrogan!
- Replaced long-deprecated Raven with native Sentry envelope implementation and send sourcemaps during build. (#2694)
- Upgraded TypeScript target from es2017 to es2024.
- Refactored TypeScript compilation cache and only enable in dev mode. (#2695)
- Removed macOS Touch Bar support. (#2696)
- Updated ESLint and Prettier, and reference local versions in VS Code settings.
- Added missing TypeScript types to function declarations across many files.
- Upgraded Electron 41.2.1 to Electron 41.5.0.
- Added Playwright tests for pre-release verification.
- Added tests covering VCF/EML business logic and other utilities.

Fixes:
- Resolves an issue with the inline composer's key handling that could cause Gmail-style shortcuts to activate while you were typing into the subject line or recipients.

Features:
- Added an "Automatic" theme (the new default) that follows system light/dark mode.
- Added system accent color support — the standard light and dark themes now use your OS accent color by default and this can be disabled from Preferences > Appearance. (#2682)
- Improved the UX around creating folders and labels in the left sidebar - it's much easier to create nested items. (#2655)
- A new "•••" menu on items in the left sidebar makes features (including the new EML export option) more discoverable.
- Added EML export functionality for messages and folders. You can save selected messages as EML by right-clicking or from the app's menu, and export entire folders by right clicking in the left navigation. (#2652)
Improvements:
- Improved password storage error handling and reporting. (#2669)
- Fixed a race condition causing Windows notification "Archive" and "Mark as Read" buttons to be unreliable.
- Added Microsoft Office 365 / Outlook account setup guidance and troubleshooting documentation. (#2656)
- Replaced text symbols with SVG icons in the toolbar. (#2658)
- Refinements to EML export task in the sidebar.
- Fixed the Wayland app_id after Electron 41 (Thanks @ReillyBrogan!)
Bug Fixes:
- Fixed an undefined @font-weight-semi-bold error in the ui-less-is-more theme. (#2684)
- Fixed a crash in quick preview when the capture window is destroyed. (#2671)
- Fixed an unhandled EPIPE error when writing to a dead mailsync process stdin. (#2673)
- Fixed race conditions in draft expiration and changeset handling. (#2678)
- Fixed broken IMAP UTF-7 encoding by replacing the broken utf7 package with a custom implementation. (#2672)
- Fixed printToPDF errors being incorrectly sent to Sentry. (#2677)
- Fixed an issue where launch options and URLs were processed before app initialization was complete. (#2675)
- Fixed a crash caused by null values in draft field change detection. (#2676)
- Fixed an issue where metadata attachment could fail for newly sent messages. (#2664)
- Fixed autoupdate error handling. (#2670)
- Fixed error handling for ICS parsing in the EventHeader component. (#2668)
- Fixed crash when navigating to 'All' with accounts that have no archive category. (#2666)
- Fixed null reference crash in ContactDetail on update. (#2661)
- Fixed MacOS notifications showing a second copy of the app's icon
- Fixed null range crash in the email composer. (#2662)
- Fixed a race condition in EmailFrame that could deliver a null doc.body to message extensions. (#2665)
- Fixed OAuth code parsing to handle + characters correctly. (#2654)
- Fixed the core:pop-sheet shortcut being blocked in the message list with an open reply composer. (#2653)
- On Windows, fixed font-weight rendering by using CSS variables. (#2650)
- On Linux, fixed xdg-mime 'not found' error not being caught on dash-based shells. (#2667)
- Added error handling for shell.openExternal calls to prevent crashes on unsupported URLs. (#2679)
Developer:
- Fixed ability to declare platform-specific options via config-schema. (#2681)
- Moved appdata.xml to the metainfo directory for proper Linux packaging. (#2659) Thanks @BlueManCZ!
- Replaced direct Electron dialog.showErrorBox calls with AppEnv.showErrorDialog. (#2680)
- Improved plugin activation error handling and TypeScript compilation. (#2674)
- Suppressed LESS parse errors from Sentry reporting. (#2663)

Bug Fixes:
- On Windows, fixed notification click handling and removed a redundant window display call. (#2648)
- Fixed the custom port input not updating in IMAP onboarding. (#2646)
- Fixed VoiceOver handling on email composer token inputs (To, CC, BCC, etc.).
Improvements:
- Additional accessibility improvements: arrow key navigation and roving tabindex between messages in the message list, keyboard focus improvements in the account sidebar, email frame ARIA target for read-all support, and focus management fixes for modals and preferences.
- On Linux, added Wayland session detection and a fallback menu button for window managers that don't support the system tray. (#2647)
- Improved handling of navigation keys (arrow keys, etc.) in the composer typing state. (#2644) Thanks @ejbiker93ss!
- Improved contact details panel styling.
- On Linux/Wayland: frameless windows now display GTK drop shadows and support extended resize borders
Developer:
- Updated to Electron 41 (Chromium 146, Node.js 24.14), up from Electron 39 (Chromium 142, Node.js 22). (#2643)
- Chromium updated from 142 → 146, bringing security patches and modern web standard support
- Fixed white flash when opening app windows
- Reduced GPU memory usage on macOS
- On Windows: fixed a crash with UTF-8 file paths and a hang in native notification delivery
- On macOS: fixed menu items incorrectly staying disabled after being re-enabled
- On Windows: fixed window fullscreen state not being preserved correctly
- On Windows: system notifications now support action buttons and inline reply inputs
- Fixed keyboard shortcut accelerators not working after toggling a menu item's enabled state
- Replaced the deprecated Electron clipboard renderer API with the standard navigator.clipboard API
- Replaced legacy dependencies (fs-plus, rimraf, mkdirp, uuid, temp) with native Node.js APIs, removing several third-party dependencies.
- Removed unused dependencies deep-extend and graceful-fs.
- Added TypeScript typecheck and lint steps to the per-commit GitHub Actions workflow.
- Updated license dates.

Features:
- Grammar check is now available in the composer! (#2612)
- This feature relies on a deployment of LanguageTool at id.getmailspring.com - when you use Grammar Check, small snippets of your draft are sent to this server, but the requests are not logged and no message data is stored.
- This feature is disabled by default. To turn it on, click the new icon in the composer toolbar.
- Mailspring now properly detects "Do Not Disturb" status on MacOS Sequoia and on Windows.
Bug Fixes:
- On Wayland, the --background flag now shows the main window briefly then hides it, which is the best we can do under Wayland's rules. (#2623)
- On Wayland, fixed a keyboard freeze in the composer caused by a double focus() call. (#2622)
- Fixed sound notifications playing on Windows regardless of the notification preference. (#2619)
- Fixed the tray icon theme detection on GNOME/Unity Linux desktops. (#2610)
- Fixed a crash in vCard parsing when the VERSION line is not found.
- Fixed an issue with the first CardDAV sync incorrectly seeing existing ETags in mailsync.
- Fixed IMAP IDLE to process VANISHED notifications sent by FastMail (and possibly other providers).
- Fixed folder priority logic that was incorrectly applied to non-iCloud accounts in mailsync.
Improvements:
- Added support for the stnadard biographies / notes field on contacts. (#2621)
- Rearranged the thread context menu to reduce accidental destructive actions. (#2620)
- Added an empty state to the calendar when no CalDAV accounts are connected. (#2625)
- The draft window now uses the message subject as the window title.
- Improved read receipt tracking pixel reliability. (#2613)
- Improved mail rules robustness and fixed condition evaluation bugs. (#2616)
- Added VTIMEZONE to created calendar events so they are created on Yahoo in the correct timezone.
- Enabled CalDAV discovery to support Fastmail, Yahoo, and other providers in the upcoming calendar.
- On Windows, the app icon is now a rounded square to better fit with Windows 11 design guidelines.
Developer:
- Replaced CSS-based platform hiding with React conditionals in preferences. (#2614)
- Removed subpixel-antialiased font smoothing overrides. (#2618)
- Added syncInit to main-calendar to eliminate a 2.5s startup delay. (#2606)

Features:
- Added Agenda view to the calendar for chronological event browsing. (#2592)
- Added Linux Do Not Disturb detection for notification suppression. (#2595)
- Added Windows jump list and badge icon desktop integration. (#2594)
- Added ARM64 (aarch64) Linux build support. (#2601)
- The selected calendar view now persists across sessions. (#2600)
Bug Fixes:
- Fixed support for Wayland - window activation context is now handled gracefully. (#2599)
- Fixed the app's system tray icon appearing as three dots (•••) at launch on Ubuntu 25.
- Fixed summary notifications: broken Windows toast URLs and race condition. (#2597)
- Improve Yandex account sync by ignoring their XLIST implementation, which is known to be buggy.
- Fixed mutex re-entry locks during exception handling in mailsync that could be hit if a network disconnect caused both sync workers to throw at the same time.
- Reverted IDLE error suppression that caused sync issues.
Improvements:
- On Linux, default to thin window framing with hamburger-style right menu. (#2604)
- On Linux, added dark/light system tray icon support. (#2602)
- Improved JS algorithm performance using Map/Set for better collection handling. (#2596)
- Enabled support for custom config directory path. (#2587) Thanks @DerDemystifier!
- Added missing release info in appdata. (#2586) Thanks @ychavoya!
Developer:
- Updated node-abi to 3.87.0 and added support for prebuilt better-sqlite3 binaries. (#2598)
- Signed native .node addon files for Smart App Control compliance. (#2589)
- Fixed RPM packaging dependencies for Fedora 43 and openSUSE compatibility. (#2590)
- Fixed openSUSE CI test and RPM post-install scriptlet issues. (#2591)

- Updates the .deb package dependencies to address Ubuntu 25 (libtidy58 replaces libtidy5deb1) and Linux Mint 22 (libcurl4t64, libgtk-3-0t64 instead of libgtk-3-0) installation issues.
- Fix issues sending email on Windows caused by missing SASL libraries in some scenarios.
- Screenshot mode now blurs the content of your emails as well (Thanks @cheack!)
- The Spanish - Latin America (es_419) translations have been verified (Thanks @MiguVT!) and we've used the latest LLMs to update machine translations in other language files that were many years old.

Features:
- Calendar now includes a Day View for more detailed scheduling. (#2573)
- Calendar events can now be edited and synced back to the server. Drag events to reschedule them, or double-click to edit details. (#2574)
- Mailspring now supports one-click unsubscribe using email headers (RFC 2369/8058). When an email includes unsubscribe headers, a link appears to quickly unsubscribe. (#2576)
Bug Fixes:
- Fixed a race condition in category pickers (folder/label selectors) that caused the search input to lock up. (#2580)
- Fixed composer input lag where Enter and Backspace keys sometimes required multiple presses. (#2578)
- Fixed Office365 OAuth authentication issues caused by an origin header. (#2579)
- Fixed RSVP calendar event handling bugs and improved RFC 5546/6047 compliance. (#2575)
- Add missing mailsync dependencies to the Linux packages. We now dynamically link against curl, etc. and need these to be listed as Requirements.
- Improve reliability of iCloud accounts by disabling QRESYNC, which is known to be incorrectly implemented by iCloud. Note: I /think/ this will fix the long-standing disappearing messages issue, at the expense of slightly slower sync of non-inbox folders.
- Fixed network error handling during CardDAV/CalDAV discovery.
- Fixed HTTP 406 errors during CardDAV/CalDAV discovery on Yahoo accounts.
- Fixed in-reply-to header parsing on iCloud accounts where spam messages contain garbage values.
- Fixed Yandex account sync error handling.
Improvements:
- Screenshot Mode now supports non-Latin characters. (#2577) Thanks @cheack!
Developer:
- Added GitHub Actions checks that verify Linux artifacts (.deb, .rpm) install and run correctly on Ubuntu 22/24, Fedora 40/41/43, and Arch Linux.
- Removed unused Grunt tasks and cleaned up the eslint task. (#2569)
- Windows mailsync dependencies moved to vcpkg for OpenSSL 3.6, latest libcurl, iconv, libtidy, libxml2, and sasl2.
- Added openSUSE Tumbleweed to mailsync CI tests.

Bug Fixes:
- Keyboard navigation in Mailspring's thread list has been fixed!
- On Fedora, the libtidy dependency is more broadly specified to support both soname versions (libtidy.so.5 or libtidy.so.58)
We're aware of issues with Wayland support for some Linux users and are investigating how to handle these scenarios better, since Wayland became the default for Electron apps in September.

This is Mailspring's largest update in a while!
This release includes significant security updates - Mailspring now uses the system-bundled sasl2, ssl, crypto and curl libraries on all Linux platforms, and the UI has moved to the latest version of Electron and many, many other dependencies. We've applied additional security patches, and the UI is faster than ever thanks to upstream improvements in Chromium. On Linux, Electron 39 also brings native support for Wayland.
On Windows, this release resolves longstanding issues with spellcheck and adds support for rich toast notifications with inline actions.
The "infinite sync bug" that impacted iCloud accounts has been fixed, and we reviewed and applied many other patches to Mailcore and libetpan to improve stability of email sync. The updates also add supprt for TLS Server Name Identification (SNI).
Bug Fixes:
- On Windows, the Start Menu integration has been updated for Windows 11 and the "default mail client" option now links directly to Mailspring's page in Windows Settings.
- On Windows, mailto: link handling no longer breaks due to a launch argument parsing issue.
- On Windows, spellcheck now works correctly by using the DOM spellcheck attribute with typing debounce. (#2535)
- On macOS, Mailspring can now correctly create and delete the LaunchAgent file for launch on startup. (#2509)
- On Linux, the tray icon no longer shares an ID with other Electron apps. (#2529)
- On Linux, native Wayland support is now enabled in the Snap package. (#2527)
- The "Message Clipped - Show All" window no longer has encoding issues. (#2526)
- "Download All Attachments" no longer incorrectly renames files with hyphen-number patterns. (#2531)
- Additional safeguards have been added to attachment preview generation. (#2523)
Localization:
- Hungarian is now a manually verified language!
- Brazilian Portuguese (pt-BR) translation has been updated. (#2504, #2506)
Developer:
- Mailspring now uses Electron 39, Chromium 140, and Node.js 22 for improved performance and security.
- Mac, Windows, and Linux builds are now managed entirely with Github Actions, and new Github Actions for mailsync verify that the Linux binary is portable and is able to resolve certificates and authenticate against IMAP, SMTP, and our web backend on Ubuntu, Fedora, and Arch Linux.
- TypeScript has been upgraded from version 3 to version 5. (#2547)
- React has been upgraded from 16.6.0 to 16.9.0. (#2545)
- Windows builds now use GitHub Actions instead of AppVeyor. (#2524)
- Many dependencies have been upgraded to address npm audit issues, including better-sqlite, uuid, ical.js, juice, lru-cache, snarkdown, and node-emoji.
Sync Improvements:
- Fixed multiple memory leaks, race conditions, and potential deadlocks following an in-depth automated code review.
- Fixed CardDAV to avoid re-discovering address books on every sync.
- Fixed SMTP EHLO/HELO with IPv6 addresses on Linux.
- Fixed handling of empty IMAP parts from Outlook.com servers.
- SQLite has been upgraded to the latest version.
- Fixed Windows build compatibility with strptime and timegm functions.
Calendar Preview:
- The Calendar preview now includes a full month view with day, week, and month navigation.
- You can now search for events in the calendar.
- Dragging calendar events will soon update their time, making it easier to reschedule items.
- CalDAV sync now supports calendar colors, recurring events with exceptions, and smart rate limiting for 429 responses.
- CalDAV now uses ctags to skip unnecessary syncs when calendars haven't changed.
- Fixed CalDAV crashes on Gmail accounts when parsing privilege-set.
Notes:
If you run into issues with the Main window not appearing on Linux after the upgrade, try disabling Wayland by launching Mailspring with mailspring --ozone-platform=x11. That flag is required in VMs and other environments without GPU acceleration.

- Thunderbird-style Autoconfiguration (#2493)
- Fix in-app previews for PDF attachments on Windows / Linux
- Update and improve zh-TW Traditional Chinese locale (#2498)
- Update Czech translation (#2500)
- snap: Use core24 as base (#2497)
- Change lsb-core-noarch to be an optional dependency in the RPM package. (#2503)
- Fix a few misc application errors logged to our reporting service
- Upgrade to Electron 37.2.2 - Chromium 138, V8 13.8, and Node.js 22.16 for faster JavaScript execution and better email rendering, native system context menus on Linux, and more!

This is a patch release that resolves several user-reported issues. Thank you!
- On Windows, notifications could not appear because of an issue checking Windows "Quiet Hours" settings
- Dragging and dropping file attachments to the composer or the signature editor resulted in a path error.
- On Windows, you may need to install Language Packs for some languages to be available for spellcheck, and this no longer causes an error.
- The RPM build no longer generate build_id links to prevent conflicts when installing multiple Electron apps.

Happy 2025! This version of Mailspring upgrades the app to Electron 33 and Chromium 130, ensuring the latest upstream bug fixes, security patches and improvements are available in the app.
- macOS 10.15 (Catalina) is no longer supported. macOS 11 (Big Sur) or later is required.
- We are considering dropping Ubuntu 16, Ubuntu 18 and other Linux releases >6 years old. If this would impact you, please let me know at ben@foundry376.com! It's getting harder to build a mailsync binary because our CI services are dropping support.
Fixes:
- Mailspring now conforms to the AppStream metainfo standard. Thanks @mischkl!

This version of Mailspring includes several changes and bug fixes, as well as an update to our Electron core.
- Mailspring now connects to Outlook accounts using OAuth, resolving connection issues for Hotmail, Outlook and some Office 365 accounts.
- The autoconfig database used to identify your IMAP and SMTP settings automatically has been upgraded to reflect changes in provider settings.
- On Windows and Linux, previewing attachments is more robust and works with a wider variety of files. These attachments also have rendered previews in the message view.
- Mailspring allows you to add Medium, GitHub and YouTube links to email signatures created in the app. (#2484) Thanks @sudeephazra!
- Subject lines no longer overflow if they contain single long words (#2485) Thanks @probablykasper!
- The Simplified Chinese translations have been improved - thanks @qiuzhiqian!
Developer:
- Mailspring now uses Electron 30, a recent supported release based on Chromium M124 - thanks to @Phylu for lots of PRs and manual testing that helped us move up three years of versions (v17 => v30) in the last 12 months!
- The Changelog now mentions security contributions by Positive Technologies, Payatu, and Sonar in v1.13.3.
Note: This release does not fix ongoing issues with Gmail OAuth - we are working through Google's revised certification process for continued access to the Gmail API and expect it to be complete in the next two weeks. Thanks to everyone for your patience, their process changed this year.

- Composition events in Mailspring's composer should work as expected. (Typing modifier keys, such as Option-E followed by E to create É)
- The composer warn about several more invalid recipient errors correctly (thanks @Phylu!)
- Dark-mode tray support on Windows has been improved with new icons (thanks @Phylu!)
- The Linux Snap build no longer requests extraneous permissions (thanks @3v1n0!)

- Visit Preferences > Subscription and click Setup Mailspring ID and sign back in to your Mailspring account. (You should see an alert at launch that will remind you which email address you'd used for your Mailspring ID)
- Visit Preferences > Accounts and re-authenticate any accounts shown in red that are having connection difficulty.

- The Windows tray icon styles have been improved, and a new option allows you to opt-out of the red icon style. (Thanks @Phylu)
- Mail rules now support filtering based on the "Reply-to" header. (Thanks @Phylu)
- The "Snooze" UI now allows you to type "600" as a shortcut for for "6:00". (Thanks @ChocoTonic)
- The snooze label is less ambiguous and includes the month and year. (Thanks @Phylu)
- British english localizations have been added. (Thanks @danbishop)
- Traditional chinese localizations have been greatly improved. (Thanks @PeterDaveHello)
- Mailspring now stores your mail secrets using Electron SafeStorage instead of the deprecated Keytar library thanks to updates by @Phylu.
This will allow us to move to a newer version of Electron soon!
- The Snap package now uses core22 and the gnome extension. (Thanks @soumyaDghosh)

- The "Move to Folder" menu action allows you to press Tab or the "→" key to complete the name of the highlighted folder, which makes it easier to complete a path in long folder hierarchies.
- Mailspring now properly identifies and formats quoted text from Yahoo and AOL email. (Thanks @nzayatz14)
- On MacOS, the Mailspring icon in the dock now allows you to compose a new message from the context menu. (thanks @Naroh091)
- Mailspring's menu bar icon is now red for new mail and blue for unread mail, which makes it easier to spot a new message that needs attention. (#2433, thanks @marivaldojr)
- Contact sync no longer crashes when a contact has no display name (thanks @ww-daniel-mora)
- The help menu now offers the standard MacOS "menu search" feature (Thanks @probablykasper)
- Colons are allowed in URLs and no longer break Mailspring's link highlighting. (thanks @choptastic!)
- The email preview is no longer in some cases in vertical layout (thanks @glenn2223!)
- Updated Italian translations (thanks @andy00087!)
- Mailspring now uses a more restrictive Content-Security-Policy that includes object-src none; media-src mailspring:; manifest-src none;.
If your plugin packaged media such as sounds, you may need to reference them via the mailspring:// URL syntax (ala 2b75347c)