In a message communication system having electronic mailboxes, a method for self-cleaning of the electronic mailboxes comprises the steps of: identifying that a message is tagged for expiration; determining if the message has expired; and acting upon the message if said message has expired....http://www.google.ca/patents/US6088720?utm_source=gb-gplus-sharePatent US6088720 - Self-cleaning and forwarding feature for electronic mailboxes
