K-9 Mail is an open source email client for Android with many advanced features.


  • Push IMAP support
  • WebDAV support
  • Attachment saving
  • Attach any file on the SD card type when OI File Manager is installed
  • BCC to self
  • Signatures
  • Message flagging
  • Per account notification
  • Choice of black or white theme
  • Multiple identities
  • Message list sorting
  • Keyboard shortcuts
  • Many performance enhancements
  • GPG & PGP/MIME support using OpenKeychain (formerly APG)
  • Emoji support
  • Pinch-to-zoom
  • Mail on SD


K-9 Mail was born when Jesse Vincent created a simple patch to the Email app included in Android 1.0. Back then the creators of the Android OS hadn’t yet figured out how to handle community contributions. So he built his own version of the Email app and shared it with the world.

In some incarnations, Doctor Who had a robotic dog named “K-9”. The dog was, in effect, an android mutt. When Jesse first created K-9, his goal was to create an Android mail client as good as the UNIX mail client mutt. The name was a natural fit.

Open Source

K-9 Mail is licensed under the Apache License, Version 2.0. The source code is available on GitHub.


K-9 Mail is available in multiple flavors and through a variety of channels. Find out which version is best for you and how to get it.

Get K-9 Mail »