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Encrypting email on your Android

It's fairly easy to set up sending and receiving encrypted email on your Android using a few simple, free apps.

APG - Public key encryption for the Android. Encrypt/decrypt emails/files via OpenPGP.

K-9 Mail -  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.

OI File Manager -  allows you to browse your SD card, create directories, rename, copy, move, and delete files. It also acts as an extension to other applications to display "Open" and "Save" dialogs.

Import your keys using the APG app which automatically integrates with K-9 mail.

If you need more basic details on encryption see here.