K-9 Mail

300PSA · Tools

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5.0

1 review

downloads

6.0

android

AI summary

Open source email client supporting multiple accounts with a unified inbox. Features automatic sync, local and server-side search, and OpenPGP encryption via OpenKeychain. Version 22.0 adds an incognito keyboard privacy setting and fixes notification display, header formatting, and theme visibility issues.

Generated by AI. May contain inaccuracies.

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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.

email client open source privacy pgp encryption offline multi-account

What's new

v22.0Aug 11, 2026

New: ・Incognito Keyboard privacy setting disables Google keyboard from learning words (#3855) ・Thundermail interim screen when adding an account (#11102)
Changed: ・Selected sort option now shows an indicator in the sort menu (#11184)
Fixed: ・Messages could scroll horizontally when content fit the screen (#11038) ・Thread deletion confirmation incorrectly said only one message would be deleted (#8223) ・Notification actions were difficult to scroll and reorder on small screen (#11191) ・Show Headers collapsed multi-line email headers into a single line (#9452) ・Notification previews displayed HTML entities and markup instead of clean text (#8471, #10256) ・Select Image icon was hard to see in dark theme (#11202) ・Printed message headers always used US date format instead of local format (#11109) ・Splash screen truncated the Thunderbird name on small displays (#11172)
Contributors: ・Thanks to: @arpitagarwal1301, @coreycb, @dani-zilla, @frabera, @himu-gupta, @kryoseu, @mohitsatr, @mvanhorn, @rafaeltonholo, @saisafe, @shamim-emon, @stephenking314, @TusharBhatia34, @wmontwe
New Contributors: ・@mvanhorn made their first contribution in #11003 ・@TusharBhatia34 made their first contribution in #11227 ・@arpitagarwal1301 made their first contribution in #11280
Full Changelog: https://github.com/thunderbird/thunderbird-android/compare/K9MAIL_21_1...K9MAIL_22_0