I wrote an article on how you can do this with your own mail system: https://grepular.com/Automatically_Encrypting_all_Incoming_Email https://grepular.com/Auto

I wrote an article on how you can do this with your own mail system: https://grepular.com/Automatically_Encrypting_all_Incoming_Email https://grepular.com/Automatically_Encrypting_all_Incoming_E... PGP is not necessarily "unusable" on Mobile. I use K-9 Mail + APG (both free) on Android, and can read and write inline PGP signed/encrypted mail. It's a shame there's no PGP/MIME support though.