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Mailspring 1.26.2

The best email app for people and teams at work

filecart Linux Updated Oct 23, 2026
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About Mailspring

Mailspring is a new version of Nylas Mail maintained by one of the original authors. It's faster,
leaner, and shipping today! It replaces the JavaScript sync code in Nylas Mail with a new C++ sync
engine based on Mailcore2. It uses roughly half the RAM and CPU of Nylas Mail and idles with almost
zero "CPU Wakes", which translates to great battery life. It also has an entirely revamped composer
and other great new features.

Mailspring comes packed with powerful features like Unified Inbox, Snooze, Send Later, Mail
Rules, Templates and more. Mailspring Pro, which you can unlock with a monthly subscription, adds
even more features for people who send a ton of email: link tracking, read receipts, mailbox analytics,
contact and company profiles. All of these features run in the client - Mailspring does not send
your email credentials to the cloud.

License: GPL-3.0+
Release info Update on Oct 22, 2026
Release notes 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.
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