To paraphrase an old Klingon proverb, there can be no spam solution, so long as e-mail is free. Yahoo has unveiled plans to launch its Domain Keys software as an open-source toolkit in 2004. The intent is to allow developers of major e-mail systems to integrate Yahoo's public/private key authentication system into their own software and thus create momentum for a standard whose raison d'etre is identify verification. This is a commendable effort, but a closer look reveals that it will not only not stop the spam problem, it may have almost no effect at all. more