K-9 Mail

300PSA · Tools

Verified safeOpen source

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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 23.0 fixes a bug where the signature field only accepted single-line text in composition defaults.

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 multi-account offline

What's new

v23.0Sep 9, 2026

Fixed: ・Signature field only accepted single-line text in Composition defaults (#11343)
Full Changelog: https://github.com/thunderbird/thunderbird-android/compare/K9MAIL_22_0...K9MAIL_23_0