[Dovecot] E-Mail Encryption

Hello,

I am new to Dovecot but installation was quite easy, so there is one more LDAP authenticated, Dovecot / Postfix mailbox online, but there is one question left:

I would like to set up a configuration, which encrypts every user mail with a unique key. If user logs in, private key should be decrypted with user password and every mail user requests should be decrypted with users private key. If a mail comes in, it should be encrypted with users public key. That key pair should be used for that purpose only. Obviously a GnuPG plugin between deliver and rest of Dovecot is needed.

best reagrds Christian