This seems like a problem that could be solved by micropayments for sending and receiving emails. I've seen proposals[1] for a solution where the sender of an

This seems like a problem that could be solved by micropayments for sending and receiving emails. I've seen proposals[1] for a solution where the sender of an email pays a small fee to the recipient of the email. If you are sending as much email as you are receiving you wouldn't have to worry about using up your email. If you are sending a mass email, you will end up paying for it. In the case of no-replies, it would discourage the sender from sending an email that doesn't need to be replied to.