Comments:

The implementation of a national Do Not Email registrty will not work. With the frequency with which people change email addresses and the fact that spammers do NOT comply with CAN-SPAM anyway, it's just an exercise in futility where honest companies will waste a lot of time and money complying with a rule which isn't directly meant to apply to them. Spammers, on the other hand, will ignore it. Subject line labeling will not work. The minute a system is created, spammers will leverage the "approved" labels to their advantage. As a result, the labels will quickly become meaningless because the public will not be able to accurately rely on the integrity of a subject line label.