Foundry376/Mailspring 1.23.0

on GitHub

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!