A e-mail relay provides message filtering services to an e-mail network. The e-mail relay monitors incoming communication and intercepts e-mail messages. The e-mail relay compares attributes of the messages to data derived from SPAM messages, which is stored in a SPAM database. The e-mail relay restricts...http://www.google.com/patents/US20020199095?utm_source=gb-gplus-sharePatent US20020199095 - Method and system for filtering communication
