signature checking at the server

Unbelievably, I don't think this old canard has come up yet in this discussion. I've always perceived PGP(Tm) as something I would use when I really had something sensitive to send a friend, If you encrypt only some messages and not others, every use of encryption will indicate that something significant is going on, which is a first class message of its own. Only if all messages to particular correspondents are encrypted do you reveal no information about importance. Encryption still has benefit here, but the argument that it should only be used when important has no merit. Eric