Version: 5.400 (23600)
arm64-v8a + armeabi + armeabi-v7a + mips + mips64 + x86 + x86_64
Package: com.fsck.k9
5.06 MB (5,307,967 bytes)
Min: Android 4.0.3 (Ice Cream Sandwich MR1, API 15)
Target: Android 5.1 (Lollipop MR1, API 22)
Uploaded December 31, 2017 at 5:03AM UTC by HoldTheDoor
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- New widget: Message List
- Improved OpenPGP support
- New OpenPGP flow, adhering to Autocrypt specification
- Recipient search now includes nicknames
- Better support for multi-window
- Fixed bug that could lead to attachments not being displayed
- Many more bugfixes and optimizations
- Added translations: Albanian, Breton, Esperanto, Gaelic (Scottish), Icelandic, Indonesian, Welsh
K-9 Mail is an open source email client with support for multiple accounts, search, IMAP push email, multi-folder sync, flagging, filing, signatures, BCC-self, PGP/MIME & more!

K-9 supports IMAP, POP3 and Exchange 2003/2007 (with WebDAV).

Install the app "OpenKeychain: Easy PGP" to encrypt/decrypt your emails using OpenPGP.

K-9 is a community developed project. If you're interested in helping to make the most popular open source email client on Android even better, please join us! You can find our bug tracker, source code, mailing list and wiki at
We're always happy to welcome new developers, designers, documenters, bug triagers and friends.

If you're having trouble with K-9, please report a bug at rather than just leaving a one-star review. We don't mind you telling the world that you're frustrated, but if you use our bug tracker, we have a better chance of fixing whatever's giving you a hard time.

You can find K-9's release notes at:

(People sometimes call K-9: K9, K9 Mail, K-9 Email, K9 Email, K9 E-Mail, k9mail or k9email.)

This release may come in several variants. Consult our handy FAQ to see which download is right for you.

December 31, 2017
Android 4.0.3+
Previous APKs for (universal) variant
K-9 Mail 5.600
September 2, 2018
K-9 Mail 5.503 beta
May 22, 2018
K-9 Mail 5.403
January 7, 2018
K-9 Mail 5.400
December 31, 2017
K-9 Mail 5.208
September 5, 2017
K-9 Mail 5.207
August 1, 2017
K-9 Mail 5.202
January 5, 2017
K-9 Mail 5.010
April 4, 2016
All versions
September 2, 2018
May 22, 2018
January 7, 2018
December 31, 2017
September 5, 2017
August 1, 2017
January 5, 2017
April 4, 2016
January 29, 2016
October 12, 2015