Controlling the Assault of Non-Solicited Pornography And Marketing Act of 2003. A U.S. statute effective January 1, 2004, requiring unsolicited commercial e-mail messages to be labeled (though not by a standard method) and to include opt-out instructions

Related Articles
Messaging - Real-Time Block Lists (RBLs)
Messaging - Quarantine
Messaging - DNS Block List
Postini In Magic Quadrant on Email Security