(95,173 ratings)
  • Added support for entering Reply-To addresses when composing a message
  • Display the unread message count for the Unified Inbox in the drawer
  • Fixed crash when using the split-screen view
  • Hide notification category settings on Android versions that don't support them
  • Update the sync notification for an account instead of adding and removing it for each folder
  • A lot of internal changes to the notification code - please report any bugs or odd behavior you encounter

K-9 Mail is an open source email client that works with basically every email provider.


* 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.


If you're having trouble with K-9 Mail, ask for help in our support forum at

Want to help?

K-9 Mail is 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
We're always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.

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5.901 APK
September 17, 2021
Android 5.0+
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