K-9 Mail is an open source email client with support for multiple accounts, search, IMAP push email, multiple folder sync, markup, archive, signatures, BCC-self, PGP / MIME, and more! K-9 supports IMAP, POP3, and Exchange 2003/2007 (with WebDAV). Install the "OpenKeychain: Easy PGP" app to encrypt / decrypt your emails using OpenPGP.K-9 is a community developed project. If you're interested in helping make the most popular open source email client on Android even better, join us! We are always happy to welcome new developers, designers, documenters, bug finders, and friends.
Required Android Versions : Ice Cream Sandwich [4.0.3–4.0.4] - Jelly Bean [4.1–4.3.1] - KitKat [4.4–4.4.4] - Lollipop [5.0–5.0.2] - Marshmallow [6.0 - 6.0.1] - Nougat [7.0 – 7.1.1] - Oreo [8.0-8.1]