From the FTC press release: “The Federal Trade Commission today told Congress that, at the present time, a National Do Not Email Registry would fail to reduce the amount of spam consumers receive, might increase it, and could not be enforced effectively. In a report (60 pages, PDF) filed in response to a statutory mandate, 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.”