Abstract: A method and system for filtering messages by providing a filter for filtering messages based upon an authorization criteria. A message that satisfies the authorization criteria is forwarded to a message receiver, while a message that fails to satisfy the authorization criteria is not forwarded. The unauthorized sender is notified that the message is unauthorized, and provided with an opportunity to attempt to satisfy the authorization criteria. The attempt can be coupled with a mandatory surrender or deposit of a thing of value to permit the unauthorized sender to request authorization from the intended receiver. The intended receiver can accept or reject the attempt by the unauthorized sender, and keep or return the thing of value, such as a monetary amount. The intended receiver can provide pre-authorization for future messages.