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 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.)
K-9 mail has been my mobile mail client for over a year now.
The native mail app on my samsung galaxy relay would constantly freeze, which led me to seek a free alternative.
I have zero complaints about this application. It does what it says without much fanfare. The interface is simple and uncluttered.
I would definitely recommend K-9 mail to anyone seeking a basic android mailer.