The Federal Trade Commission has issued a new report (PDF) declining to implement a "National Do Not Email Registry" -- because of the inability to properly authenticate the origin of email messages.
The FTC also said that anti-spam efforts should focus on creating a robust e-mail authentication system that would prevent spammers from hiding their tracks and thereby evading Internet service providers’ anti-spam filters and law enforcement. To help focus these efforts, the FTC also announced that it will be sponsoring a Fall 2004 Authentication Summit to encourage a thorough analysis of possible authentication systems and their swift deployment.