AI summary
Open source email client supporting multiple accounts with a unified inbox, background sync, and OpenPGP encryption via OpenKeychain. Version 21.0 modernizes account settings and composition screens, adds finer animation controls, and fixes crashes from memory exhaustion, long message rendering, and several UI bugs including widget text scaling and custom swipe action backup restoration.
Generated by AI. May contain inaccuracies.
Screenshots
About this app
K-9 Mail is an open source email client that can be used with basically all mail service providers.
characteristics
* Support multiple accounts * unified inbox * Privacy friendly (no tracking, only connected to your email service provider) * Automatic background synchronization or push notifications * Local and server-side search * OpenPGP Email Encryption (PGP/MIME)
Install the application OpenKeychain: Easy PGP and use OpenPGP to encrypt/decrypt email.
support
If you are experiencing problems using K-9 Mail, please seek help on our support forum.
Want to help?
K-9 Mail is a community development project. If you are interested in helping improve apps, please join us! You can find our error tracker, source code and wiki here at https://github.com/thunderbird/thunderbird-android. We always welcome new developers, designers, documentarians, translators, testers and friends to join us.
What's new
- Changed:
- Animation setting now allows On, Off, and System Default options (#6027) Modernized 'Fetching mail' account settings screen (#11040) Modernized 'Composition defaults' screen (#10724)
- Fixed:
- Application could crash due to memory exhaustion (#11153) Application could crash when rendering long messages (#11148) Inline images were shown as attachments instead of displaying in message (#10889) Server search results could disappear after loading (#9142) Manage Folders opened the wrong account instead of selected account (#11128) Android widget text scaled too large when system font size was increased (#7790) Cancelling the Thundermail OAuth process incorrectly redirects users to the "Redirecting to Thundermail" screen (#11043) Custom swipe actions were not restored from exported settings backups (#10621) Links failed when trailing punctuation was incorrectly included in URLs (#11060)
About this version
- Version
- 21.0 (39041)
- Size
- 10.19 MB
- Requires Android
- 6.0
- Target SDK
- 23
- Architecture
- armeabi-v7a, x86, x86_64, arm64-v8a
- Downloads
- 21
- Updated
- Jul 21, 2026
- Package
- com.fsck.k9
Ratings & reviews
- 50
- 40
- 30
- 20
- 10