Reviewed in Email Clients for Android
The old-time favourite amongst Android email clients, K-9 is open-source and free and is basically meant for power users. It has a sheer number of customization options and it works quite well, much like the traditional email app that comes bundled with Android devices by default.
K-9 Mail is an open-source e-mail client with search, IMAP push email, multi-folder sync, flagging, filing, signatures, bcc-self, PGP, mail on SD & more! K-9 supports IMAP, POP3 and Exchange 2003/2007 (with WebDAV).
K-9 is a community developed project. If you're interested in helping to make the best email client on Android even better, please join us! You can find our bugtracker, source code, mailing list and wiki at https://github.com/k9mail/k-9
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 https://github.com/k9mail/k-9 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: http://bit.ly/new-k9
(People sometimes call K-9: K9, K9 Mail, K-9 Email, K9 Email, K9 E-Mail, k9mail or k9email.)