But why would you need the sender's key? They need to encrypt with your public key, which you only provide to a limited list, and change when it gets blown. Wha

But why would you need the sender's key? They need to encrypt with your public key, which you only provide to a limited list, and change when it gets blown. What we need is an automated way for requesting someone's key, approving or disapproving that request, and then storing their key for future use....in gmail.