System and method for delivery of an electronic message from a sender unknown to a recipient when such message comprises a sender code verified by recipient's electronic message handler, thereby eliminating delivery of unsolicited bulk messages. Dispensing sender codes per recipient addresses thwarts...http://www.google.com/patents/US7444380?utm_source=gb-gplus-sharePatent US7444380 - Method and system for dispensing and verification of permissions for delivery of electronic messages
