The present invention provides for generating inputs that can be provided to a message classification module to facilitate more reliable classification of electronic messages, such as, for example, as unwanted and/or unsolicited. In one embodiment, a sending messaging server provides an appropriate response...http://www.google.com/patents/US7398315?utm_source=gb-gplus-sharePatent US7398315 - Reducing unwanted and unsolicited electronic messages by preventing connection hijacking and domain spoofing
