Comments:

So far, the act has done nothing to slow the torrent of spam. I'm still getting 100+ per day, sometimes exceeding 150 by a significant amount. The only thing I can see stopping spam is to make it technically "expensive" to deliver. Require all email to be sent using a certificate. That way, any server that does not have a certificate will be blocked. Also, that guarantees the name and address of the server, allowing much easier generation of block lists. Forcing a validation of the sender's name at the originating server should also be required. If the name is forged, and not valid on the server, the mail should be dropped. Reverse lookups of server name to IP address should also be required, which would prevent spammers from using hijacked computers to send their spam.