Patent ID: 7627635
Filing Date: 2009-12-01
Classification: H04L

Abstract:
1. In an electronic message system in which challenge messages can be sent to purported senders of electronic messages to determine whether the purported senders appear to be persons rather than machines, the electronic message system implementing a computing device comprising a computer-readable memory including computer-executable instructions stored thereon that when executed by a processor on the computing device, causes the computing device to perform a method for delivering a self-addressed electronic message without issuing a challenge message, comprising: storing two or more user identifier data structures associated with a particular recipient, each data structure containing: receiving an electronic message with a sender address and a recipient address; accessing the two or more user identifier data structures to determine that the sender address and the recipient address are contained in the two or more user identifier data structures to conclude that the sender address and the recipient address are both associated with the recipient; and determining whether to accept delivery of the electronic message based on the relationship between the sender address and the recipient address, wherein