(95,001 ratings)
  • Major redesign of the user interface
  • Changed periodic background sync and push implementations to work much more reliably
  • Deprecated support for the WebDAV protocol; new accounts can no longer be added
  • K-9 Mail now requires Android 5.0 and newer
  • Added support for Autocrypt setup message
  • Added support for encrypted subjects
  • Don't use default signature when setting up a new account
  • Allow installation on external media (Android 6+ with adopted storage)
  • Removed keyboard shortcuts for menu items; on some devices they conflicted with system shortcuts
  • Removed the broken option to store the message database on external storage
  • Removed the 'remote control' interface third-party apps could use to change some settings in K-9 Mail
  • A lot of other bug fixes, internal changes, and improvements
  • Check out the changelog entries for 5.7xx versions for a lot more details

The forum thread for this release:

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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5.800 APK
July 24, 2021
Android 5.0+
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