Unfortunately, most people don't care enough about encryption to put in effort using it. I'd love it if when people sent me unencrypted email, their mail serve

Unfortunately, most people don't care enough about encryption to put in effort using it. I'd love it if when people sent me unencrypted email, their mail server noticed that I have a published PGP key, and encrypted the email with it before passing it on. EDIT: Also, as for your P2P idea, IIRC there are Usenet groups where people post PGP encrypted messages for the intended recipient to pick up.