Microsoft Technology Licensing, LLC

Saeed Noursalehi

Max Glenn Morris

Qiang Wang

Andrew J Wallace

Samuel Neely

Neil K Koorland

Erik Hedberg

A method that determines if a sender's message is to be sent to a recipient is presented. A challenge module analyzes the message and sends a challenge message to the sender if the sender is not in the recipient's address store. The challenge message includes a pseudo unique token for the sender recipient pair such that the sender must respond differently to each challenge message for a particular message. In one embodiment, the challenge message requires the sender to obtain a certificate from a certificate authority or a set of authorities.

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Saeed Noursalehi