K-9 Mail

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K-9 Mail
K9 Mail Screenshot.jpg
Developer(s) Jesse Vincent and contributors
Stable release
5.008 / February 9, 2016; 7 months ago (2016-02-09)[1]
Development status Active
Written in Java
Operating system Android, Blackberry 10 (Version 4.317)[2]
Type Email application
License Apache License 2.0
Website github.com/k9mail/k-9/
Repository github.com/k9mail/k-9/

K-9 Mail is an independent mail application for the Android operating system. It is made available as Free/Open Source Android Software under the Apache License version 2.0. The program is marketed as a more functional replacement for the default mail application included on most phones. It supports both POP3 and IMAP mailboxes and supports IMAP IDLE for real-time notifications.

Its name and logo stem from a dog-like robot in the British cult TV series Doctor Who.

The source code was first published to its git repository on October 27, 2008[3] by Jesse Vincent and the first binaries were released to the public on the Google Code site the same month.[4]


  • Works with IMAP, POP3 and Exchange 2003/2007 (with WebDAV) accounts
  • Folder Sync
  • Encryption with APG/OpenKeychain support
  • Signatures
  • SD Card Storage


This application has been downloaded from the Google Play Store between 5 million and 10 million times since its release and has been rated by over 40,000 people with either 4 or 5 stars. It has been widely reviewed and praised in the media as a replacement for the default mail application.[5][6][7][8]


  1. ^ "Releases". 
  2. ^ http://appworld.blackberry.com/webstore/content/20394982/?lang=en&countrycode=AT
  3. ^ "k9mail/k-9". Github. Retrieved 1 September 2013. 
  4. ^ "Downloads - k9mail - K-9 Mail is an advanced email client for Android - Google Project Hosting". Code.google.com. Retrieved 2013-08-15. 
  5. ^ Paul, Ryan (2011-01-24). "Excellent K-9 mail app for Android keeps your messages on a leash". Ars Technica. Retrieved 2013-08-15. 
  6. ^ "K-9 Mail v4.406 (K9Mail) update19 07 2013 Android Apk". MrCrab.Net. Retrieved 1 September 2013. 
  7. ^ "K-9 Mail Review". YouTube. 2010-07-12. Retrieved 2013-08-15. 
  8. ^ "K-9 Mail Receives First Significant Update In 9 Months - Improved Interface, Altered Widget, Bug Fixes, And More". Androidpolice.com. 2013-06-28. Retrieved 2013-08-15. 

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