K-9 Mail

com.fsck.k9

K-9 Mail is an open source email client that works with basically every email provider. **Features** * supports multiple accounts * Unified Inbox * privacy-friendly (no tracking whatsoever, only connects to your email provider) * automatic background synchronization or push notifications * local and server-side search * OpenPGP email encryption (PGP/MIME) Install the app "OpenKeychain: Easy PGP" to encrypt/decrypt your emails using OpenPGP. **Support** If you're having trouble with K-9 Mail, ask for help in our support forum at https://forum.k9mail.app **Want to help?** K-9 Mail is now part of the Thunderbird family and remains a community developed project. If you're interested in helping to improve the app, please join us! You can find our bug tracker, source code, and wiki at https://github.com/thunderbird/thunderbird-android We're always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.

First release: Nov 10, 2026, 1 total release.

Most recent release: Nov 10, 2026.

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Releases

Nov 10, 2026 K9MAIL_25_0

Fixed: - Message composer could crash when rotating the screen or editing a message as new (#11302) - HTML signature text could disappear after rotating the screen (#11528, #11555) - Deleted email notifications could reappear or remain in the notification shade (#10936) - Some HTML drafts hid attachments while editing and could permanently lose them on save (#954) - Add to contacts crashed the app when no Contacts app was installed (#11548) - Sending large PGP-encrypted attachments showed no progress during encryption (#5763) - Account drawer behaved inconsistently when reselecting an account or tapping its icon (#11461) - Account drawer controls blocked accounts and folders on small displays (#11476) - Sort menu indicator (bullet point) was duplicated each time the menu was opened (#11274)

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Contributors: * Thanks to: @coreycb, @dani-zilla, @dougsparling, @Friese2001, @itshakemd, @itsSiide, @khaledhaltam, @kryoseu, @PurkkaKoodari, @rafaeltonholo, @schorschii, @shamim-emon, @stephenking314, @taljeon, @wmontwe New Contributors: * @taljeon made their first contribution in #11571 * @itshakemd made their first contribution in #11594 **Full Changelog**: https://github.com/thunderbird/thunderbird-android/compare/K9MAIL_24_0...K9MAIL_25_0