I want the ability to specify a list of top Level Domains, and or keywords found in the email address of the sender, and have the server return a "User Not Found" to these requests, then drop the connection.  Then any future requests from that IP should all be given a User Not Found" message.  If an adjacent IP address also trys, the entire IP Block should be blocked in this manner.  Currently I have implimented my own solution to this, but I would really like to tell spammers I don't exists anymore in hopes they will remove me from their lists. Currently Smartermail telling spammers, "Spam Not Allowed", or "IP blocked", just tells them to try again