K-9 Mail

300PSA · Tools

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6.0

android

AI summary

Open source email client supporting multiple accounts with unified inbox, background sync, and OpenPGP encryption via OpenKeychain. Version 24 adds HTML signatures per identity and smarter reply prompts. Requires camera permission for QR code account setup and attachment capture.

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.

📄 License Apache License,Version 2.0.

email open source privacy pgp encryption offline

What's new

v24.0Oct 6, 2026

New: ・Signatures can be formatted as HTML for individual identities (#11405) ・Reply prompts users to choose Reply or Reply All when both are applicable (#7055)
Changed: ・Long account names are resized to fit within two lines in the account drawer (#10229)
Fixed: ・Selected compose text was invisible in light theme due to white highlighting (#10974) ・Status bar icons became unreadable when selecting messages in light theme (#11305) ・Recipient expander would not collapse after editing message subject or body (#11375) ・Thunderbird could crash when adding an attachment to a message using the camera (#11296) ・Save All incorrectly saved each attachment using the content of the last file (#10965) ・HTML signature text could disappear after rotating the screen (#11528) ・Editing as new used the default identity instead of the original one for queued mail (#11348) ・QR code scanner failed to open when no accounts were configured (#11276) ・Unsupported QR codes did not display feedback after scanning (#8520) ・With a hardware keyboard the focus could not leave To, Cc or Bcc (#8231)
Full Changelog: https://github.com/thunderbird/thunderbird-android/compare/K9MAIL_23_1...K9MAIL_24_0