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 unified inbox, background sync, and OpenPGP encryption via OpenKeychain. Version 23.1 fixes decoding of attachment filenames with non-ASCII characters. Requires camera, contacts, and biometric permissions.

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

What's new

v23.1Sep 22, 2026

Fixed:
Attachment filenames with non-ASCII characters were incorrectly decoded and saved (#11508)
Full Changelog: https://github.com/thunderbird/thunderbird-android/compare/K9MAIL_23_0...K9MAIL_23_1