Kaiten supports IMAP Push, POP3, Exchange 2003/2007 (with WebDAV).
Kaiten supports multi-folder sync, flagging, filing, signatures, bcc-self, PGP, mail on SD, multiple identities, search, configurable notifications & more!
Built by K-9's lead developer, Kaiten is simpler, easier to work with and a whole lot prettier. Frequently used commands are now available in the application's action bar. If you have the screen real-estate, Kaiten's split-screen view lets you see a mailbox and individual messages side-by-side.
If you're having trouble with Kaiten, drop me a line and I'll do everything I can to help you out.
Please note that neither K-9 nor Kaiten Mail currently support Exchange ActiveSync.
Kaiten's name is a play on K-9. It's a Japanese word that means rotation and sounds a lot like K10 or K-10.
Fixed bug that caused the end of drafts to be cut off (only works for newly downloaded drafts)
Fixed a crash bug
Improved handling of failing IMAP commands
Added option to allow sorting the message list by arrival date/time
Add sender of a message to recipients when using "reply all" on a message with a Reply-To header
Various UI improvements
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Latest version: 1.223 (for Android version 2.1 and higher)