Fire Mail

Manage all email accounts at the same time! Hotmail, Gmail, Yahoo, Outlook, AOL, iCloud, Live, Exchange or GMX; whichever comes first, myMail supports all major email providers and other email boxes with IMAP or POP3 support.

Fire Mail is an open source email client with support for multiple accounts, search, IMAP push email, multi-folder sync, flagging, filing, signatures, BCC-self, PGP/MIME & more!

Fire Mail supports IMAP, POP3 and Exchange 2003/2007 (with WebDAV).

Install the app "OpenKeychain: Easy PGP" to encrypt/decrypt your emails using OpenPGP.