# Mailspring changelog

> A fast, beautiful email client for every mailbox.

- Vendor: Foundry 376
- Category: Communication
- Platforms: Desktop
- Official site: https://getmailspring.com
- Tracked by: What's New (https://whatsnew.fyi/product/mailspring)
- Harvested from: GitHub (Foundry376/Mailspring)
- Entries below: 10 (newest first)

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

## Releases

### 1.23.0

- Date: 2026-07-22
- Version: 1.23.0
- Original notes: https://github.com/Foundry376/Mailspring/releases/tag/1.23.0
- Permalink: https://whatsnew.fyi/product/mailspring/releases/1.23.0
- Labels: Platforms: Desktop

- **added** — Added Office 365 shared mailbox support
- **added** — Added the ability to export folders to mbox files
- **added** — Added an option to count unread messages across all accounts
- **added** — Added a toggle for email render mode
- **added** — Added an MCP server (off by default) that lets local agents interact with mail
- **added** — On Linux, added a taskbar unread badge for KDE and other non-Unity desktops
- **fixed** — Fixed a composer crash on quoted emails with inline images
- **fixed** — Fixed a composer crash when grammar-check decorations apply mid-composition
- **fixed** — Fixed missing Slate attributes on the IMAGE_TYPE fallback node
- **fixed** — Fixed a composer cut crash and suppressed Sentry noise from third-party plugins
- **fixed** — Fixed a crash when dragging threads to the sidebar after a thread is deleted
- **fixed** — Fixed a crash in EventRSVPTask when attendee ICS data goes stale
- **fixed** — Fixed a crash in the translation plugin when the iframe contentDocument is not yet loaded
- **fixed** — Fixed an onboarding crash when back-navigation empties the page stack
- **fixed** — Fixed navigator.clipboard.writeText in @electron/remote MenuItem handlers
- **fixed** — Fixed an ERR_FILE_NOT_FOUND crash in Show Original when the RFC822 fetch fails
- **fixed** — Fixed null crashes in SendDraftTask, thread-sharing, and send-and-archive
- **fixed** — Fixed a null crash in three IPC handlers when BrowserWindow.fromWebContents() returns null
- **fixed** — Fixed cancellation of GetManyRFC2822Task for folder export
- **fixed** — Fixed handling of XDG paths

##### 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!

### 1.22.0

- Date: 2026-06-13
- Version: 1.22.0
- Original notes: https://github.com/Foundry376/Mailspring/releases/tag/1.22.0
- Permalink: https://whatsnew.fyi/product/mailspring/releases/1.22.0
- Labels: Platforms: Desktop

- **added** — Add the ability to choose which themes apply in automatic light/dark mode
- **fixed** — Fix null crash when clicking "Send now" on undo-send toast after the message had already been sent
- **fixed** — Fix two null-access crashes reported in Sentry
- **fixed** — Fix two Sentry crashes: null account in preferences and null window in app menu IPC
- **fixed** — Fix crash when archiving from search with label-based archive categories
- **fixed** — Fix null crash when removing threads with unsynced trash/archive category
- **fixed** — Fix Outlook account setup
- **fixed** — Fix Windows print crash caused by invalid file URL
- **fixed** — Fix TOCTOU null-reference crash in draft body setter
- **fixed** — Fix DefaultClientHelperMac passing boolean to error callback, causing false Sentry reports
- **fixed** — Fix AttributeDateTime.fromJSON treating 0/falsy values as missing
- **fixed** — Fix quickpreview CSP clobbering the default session's app-wide CSP
- **fixed** — Fix QuerySubscription._fetchRange contiguity check using actual result length
- **fixed** — Fix EPERM crash on Windows when forking background query agent
- **changed** — Improve Microsoft OAuth with better email resolution and suppressed no-mailbox errors from Sentry
- **changed** — Add diagnostics around "draft not found" error on send and clean up waiting queues
- **changed** — Move payment flow out of modal to launch on the web for newer Stripe integration
- **changed** — Draft reminders now use thread: metadata prefix so sync engine promotes them to thread on send
- **changed** — Sync engine now forwards identity-level refresh events from delta stream

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)

### 1.21.1

- Date: 2026-05-20
- Version: 1.21.1
- Original notes: https://github.com/Foundry376/Mailspring/releases/tag/1.21.1
- Permalink: https://whatsnew.fyi/product/mailspring/releases/1.21.1
- Labels: Platforms: Desktop

- **changed** — Optimized search regex compilation in category and label pickers
- **changed** — Improved sync engine performance by reducing unnecessary SQLite writes and moving parsing outside transactions
- **fixed** — Improved theme support in calendar
- **fixed** — Fixed dark mode email bodies not reflecting the system tint color
- **fixed** — Fixed activeMarks access errors in the composer editor
- **fixed** — Fixed thread list scroll indicator not sliding through time when dragging the scroll handle
- **fixed** — Fixed contains error when parentFilter receives a non-Element node
- **fixed** — Fixed secrets potentially appearing in the connection error detail modal
- **fixed** — Fixed package name validation rejecting names with uppercase letters
- **fixed** — Fixed sync engine crash during many-account sync by increasing SQLite busy timeout
- **fixed** — Fixed message importance headers not normalized for compatibility with some providers
- **changed** — Improved error logging for empty or malformed error objects
- **changed** — Upgraded Electron from 41.5.0 to 41.6.1
- **changed** — Upgraded React and React DOM to v17
- **changed** — Upgraded react-transition-group from 1.2 to 4.4.5
- **changed** — Replaced deprecated componentWillMount with componentDidMount
- **changed** — Replaced legacy context API with React Context
- **changed** — Refactored class components to functional components with React.memo
- **removed** — Removed PropTypes, replaced with TypeScript types
- **added** — Added Playwright tests for composer interactions

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!

### 1.21.0

- Date: 2026-05-06
- Version: 1.21.0
- Original notes: https://github.com/Foundry376/Mailspring/releases/tag/1.21.0
- Permalink: https://whatsnew.fyi/product/mailspring/releases/1.21.0
- Labels: Platforms: Desktop

- **added** — Reply-To field in the composer header to specify a different reply address when composing messages
- **added** — Bulk RFC2822 message export functionality to the sync engine
- **fixed** — HTTP/2 framing errors that could crash the sync engine during metadata streaming
- **fixed** — Global keyboard shortcuts firing when focus is in the composer
- **fixed** — Accent color hex values from system preferences validation to prevent errors
- **security** — Tightened validation to prevent file:// URIs in email content
- **security** — Limited path traversal in protocol handler
- **security** — Added allowlist validation for IPC window and webcontents methods
- **security** — Improved HTML sanitization in the composer when pasting content
- **security** — Removed ?attach= query parameter support from mailto links
- **security** — Improved attachment name sanitization for security and compatibility
- **security** — Improved email sanitization to block CSS @import tracking vectors
- **security** — Added package name validation to prevent path traversal attacks
- **security** — Added URL validation to the autoupdate handler
- **security** — Show a notice about plugin trust when installing third-party plugins
- **changed** — OAuth sign-in now displays detailed error logs when available to help with troubleshooting
- **changed** — Used exec in mailsync wrapper script for direct signal delivery
- **removed** — macOS Touch Bar support

##### 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.

### 1.20.1

- Date: 2026-04-20
- Version: 1.20.1
- Original notes: https://github.com/Foundry376/Mailspring/releases/tag/1.20.1
- Permalink: https://whatsnew.fyi/product/mailspring/releases/1.20.1
- Labels: Platforms: Desktop

- **fixed** — Resolves an issue with the inline composer's key handling that could cause Gmail-style shortcuts to activate while typing into the subject line or recipients

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.

### 1.20.0

- Date: 2026-04-19
- Version: 1.20.0
- Original notes: https://github.com/Foundry376/Mailspring/releases/tag/1.20.0
- Permalink: https://whatsnew.fyi/product/mailspring/releases/1.20.0
- Labels: Platforms: Desktop

- **added** — Add an Automatic theme that follows system light/dark mode as the new default
- **added** — Add system accent color support to standard light and dark themes with option to disable in Preferences > Appearance
- **added** — Add EML export functionality for messages and folders accessible via right-click or app menu
- **changed** — Improve UX around creating folders and labels in the left sidebar for easier nested item creation
- **changed** — Add a menu on items in the left sidebar to make features more discoverable
- **changed** — Replace text symbols with SVG icons in the toolbar
- **changed** — Improve password storage error handling and reporting
- **fixed** — Fix race condition causing Windows notification Archive and Mark as Read buttons to be unreliable
- **fixed** — Fix undefined @font-weight-semi-bold error in the ui-less-is-more theme
- **fixed** — Fix crash in quick preview when the capture window is destroyed
- **fixed** — Fix unhandled EPIPE error when writing to a dead mailsync process stdin
- **fixed** — Fix race conditions in draft expiration and changeset handling
- **fixed** — Fix broken IMAP UTF-7 encoding by replacing the broken utf7 package with a custom implementation
- **fixed** — Fix printToPDF errors being incorrectly sent to Sentry
- **fixed** — Fix issue where launch options and URLs were processed before app initialization was complete
- **fixed** — Fix crash caused by null values in draft field change detection
- **fixed** — Fix issue where metadata attachment could fail for newly sent messages
- **fixed** — Fix autoupdate error handling
- **fixed** — Fix error handling for ICS parsing in the EventHeader component

**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)

### 1.19.1

- Date: 2026-04-07
- Version: 1.19.1
- Original notes: https://github.com/Foundry376/Mailspring/releases/tag/1.19.1
- Permalink: https://whatsnew.fyi/product/mailspring/releases/1.19.1
- Labels: Platforms: Desktop

- **fixed** — On Windows, fixed notification click handling and removed a redundant window display call
- **fixed** — Fixed the custom port input not updating in IMAP onboarding
- **fixed** — Fixed VoiceOver handling on email composer token inputs (To, CC, BCC, etc.)
- **changed** — Improved arrow key navigation and roving tabindex between messages in the message list
- **changed** — Improved keyboard focus in the account sidebar
- **changed** — Added email frame ARIA target for read-all support
- **changed** — Improved focus management for modals and preferences
- **added** — On Linux, added Wayland session detection and a fallback menu button for window managers that don't support the system tray
- **changed** — Improved handling of navigation keys (arrow keys, etc.) in the composer typing state
- **changed** — Improved contact details panel styling
- **changed** — On Linux/Wayland, frameless windows now display GTK drop shadows and support extended resize borders
- **changed** — Updated to Electron 41 (Chromium 146, Node.js 24.14), up from Electron 39 (Chromium 142, Node.js 22)
- **fixed** — Fixed white flash when opening app windows
- **changed** — Reduced GPU memory usage on macOS
- **fixed** — On Windows, fixed a crash with UTF-8 file paths and a hang in native notification delivery
- **fixed** — On macOS, fixed menu items incorrectly staying disabled after being re-enabled
- **fixed** — On Windows, fixed window fullscreen state not being preserved correctly
- **added** — On Windows, system notifications now support action buttons and inline reply inputs
- **fixed** — Fixed keyboard shortcut accelerators not working after toggling a menu item's enabled state
- **changed** — Replaced the deprecated Electron clipboard renderer API with the standard navigator.clipboard API
- **changed** — Replaced legacy dependencies (fs-plus, rimraf, mkdirp, uuid, temp) with native Node.js APIs
- **removed** — Removed unused dependencies deep-extend and graceful-fs

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.

### 1.19.0

- Date: 2026-03-10
- Version: 1.19.0
- Original notes: https://github.com/Foundry376/Mailspring/releases/tag/1.19.0
- Permalink: https://whatsnew.fyi/product/mailspring/releases/1.19.0
- Labels: Platforms: Desktop

- **added** — Comprehensive accessibility improvements, including semantic landmarks, ARIA attributes, focus traps for modals, and accessibility labels on buttons
- **added** — VCard import/export functionality to contacts
- **added** — Support for creating new calendar events via double-click on the calendar
- **added** — Calendar menu and keyboard shortcuts
- **fixed** — TypeError when a contact's birthday date is undefined
- **fixed** — Windows app restart and update handling with Squirrel
- **fixed** — canBeUndone initialization in ChangeMailTask subclasses
- **fixed** — Gracefully handle xdg-mime not being present on some Linux machines
- **fixed** — Poor Sentry reporting of errors bridged over the report-error IPC channel
- **fixed** — Invalid String Length error in the mailsync-process wrapper on very large stderr output
- **fixed** — CardDAV issue with headers on XML requests and empty multiget responses
- **fixed** — ERR_ABORTED errors from quick previews being silently reported to Sentry
- **changed** — Improved calendar event editing with ICS-based recurrence support
- **added** — Recurring event indicator icon to calendar events
- **added** — Tray icon theme picker and 'none' style option for Linux
- **changed** — Tuned thread list swipe gesture detection and added an option to disable swipe gestures
- **changed** — Folded grammar check preferences into General > Composer
- **changed** — Improved emoji popover positioning and updated emoji artwork with new additions
- **fixed** — Recovered the Slate editor when the user selects all and deletes all text, leaving only quoted text
- **removed** — Deprecated Electron 4 polyfills and other outdated TODOs

Features:

- Comprehensive accessibility improvements, including semantic landmarks, ARIA attributes, focus traps for modals, accessibility labels on buttons, and more. If you use Mailspring using a screenreader, we'd love feedback about this release. (#2638)

- Added VCard import/export functionality to contacts. (#2626)

- Added support for creating new calendar events via double-click on the calendar. (#2635)

- Added Calendar menu and keyboard shortcuts. (#2634)

Bug Fixes:

- Fixed a TypeError when a contact's birthday date is undefined. (#2632)

- Fixed Windows app restart and update handling with Squirrel. (#2631)

- Fixed `canBeUndone` initialization in ChangeMailTask subclasses. (#2630)

- Gracefully handle `xdg-mime` not being present on some Linux machines.

- Fixed poor Sentry reporting of errors bridged over the `report-error` IPC channel.

- Fixed an "Invalid String Length" error in the mailsync-process wrapper on very large stderr output.

- Fixed a CardDAV issue with headers on XML requests and empty multiget responses.

- Fixed `ERR_ABORTED` errors from quick previews being silently reported to Sentry.

Improvements:

- Improved calendar event editing with ICS-based recurrence support. (#2637)

- Added recurring event indicator icon to calendar events. (#2633)

- Added tray icon theme picker and 'none' style option for Linux. (#2628)

- Tuned thread list swipe gesture detection, and added an option to disable swipe gestures. (#2629)

- Folded grammar check preferences into General > Composer. (#2639)

- Improved emoji popover positioning and updated emoji artwork with new additions.

- Recovered the Slate editor when the user selects all and deletes all text, leaving only quoted text.

- Added `WSAGetLastError()` logging for TCP connection failures on Windows (mailsync).

Developer:

- Added `X-GNOME-UsesNotifications=true` to the Linux `.desktop` file. (#2640) Thanks @LinusDierheimer!

- Added `vcs-browser` to the Linux AppStream metadata. (#2641) Thanks @LinusDierheimer!

- Removed deprecated Electron 4 polyfills and other outdated TODOs. (#2636)

- Moved tests to `@testing-library/react`, run in GitHub Actions.

- Added community plugins and themes documentation. (#2627)

### 1.18.0

- Date: 2026-02-23
- Version: 1.18.0
- Original notes: https://github.com/Foundry376/Mailspring/releases/tag/1.18.0
- Permalink: https://whatsnew.fyi/product/mailspring/releases/1.18.0
- Labels: Platforms: Desktop

- **added** — Grammar check is now available in the composer
- **added** — Mailspring now properly detects "Do Not Disturb" status on MacOS Sequoia and on Windows
- **added** — Added support for the standard biographies / notes field on contacts
- **added** — Added an empty state to the calendar when no CalDAV accounts are connected
- **added** — Added VTIMEZONE to created calendar events so they are created on Yahoo in the correct timezone
- **added** — Enabled CalDAV discovery to support Fastmail, Yahoo, and other providers in the upcoming calendar
- **changed** — On Wayland, the `--background` flag now shows the main window briefly then hides it
- **changed** — Rearranged the thread context menu to reduce accidental destructive actions
- **changed** — The draft window now uses the message subject as the window title
- **changed** — On Windows, the app icon is now a rounded square to better fit with Windows 11 design guidelines
- **fixed** — On Wayland, fixed a keyboard freeze in the composer caused by a double `focus()` call
- **fixed** — Fixed sound notifications playing on Windows regardless of the notification preference
- **fixed** — Fixed the tray icon theme detection on GNOME/Unity Linux desktops
- **fixed** — Fixed a crash in vCard parsing when the `VERSION` line is not found
- **fixed** — Fixed an issue with the first CardDAV sync incorrectly seeing existing ETags in mailsync
- **fixed** — Fixed IMAP IDLE to process `VANISHED` notifications sent by FastMail and possibly other providers
- **fixed** — Fixed folder priority logic that was incorrectly applied to non-iCloud accounts in mailsync
- **changed** — Improved read receipt tracking pixel reliability
- **changed** — Improved mail rules robustness and fixed condition evaluation bugs

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)

### 1.17.4

- Date: 2026-02-11
- Version: 1.17.4
- Original notes: https://github.com/Foundry376/Mailspring/releases/tag/1.17.4
- Permalink: https://whatsnew.fyi/product/mailspring/releases/1.17.4
- Labels: Platforms: Desktop

- **added** — Added Agenda view to the calendar for chronological event browsing
- **added** — Added Linux Do Not Disturb detection for notification suppression
- **added** — Added Windows jump list and badge icon desktop integration
- **added** — Added ARM64 (aarch64) Linux build support
- **added** — Added dark/light system tray icon support on Linux
- **added** — Added support for custom config directory path
- **changed** — The selected calendar view now persists across sessions
- **changed** — On Linux, default to thin window framing with hamburger-style right menu
- **changed** — Improved JS algorithm performance using Map/Set for better collection handling
- **changed** — Improved Yandex account sync by ignoring their XLIST implementation
- **changed** — Updated node-abi to 3.87.0 and added support for prebuilt better-sqlite3 binaries
- **fixed** — Fixed support for Wayland - window activation context is now handled gracefully
- **fixed** — Fixed the app's system tray icon appearing as three dots at launch on Ubuntu 25
- **fixed** — Fixed summary notifications: broken Windows toast URLs and race condition
- **fixed** — 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
- **fixed** — Reverted IDLE error suppression that caused sync issues
- **fixed** — Fixed RPM packaging dependencies for Fedora 43 and openSUSE compatibility
- **fixed** — Fixed openSUSE CI test and RPM post-install scriptlet issues
- **security** — Signed native .node addon files for Smart App Control compliance

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)