Although the CAN-SPAM law clearly defines the very basic elements required in any email correspondences, spam persists and very few even have a functional method to opt out of future mailings. The test showed conclusively that the CAN-SPAM law has resulted in very little, if any, net effect on spam. The problem exists that until there are high-level prosecutions of spammers, then the law is a hollow, albeit well-intended, failure. Unless the jail terms, or penalty fees, start to get utilized often, then the law will continue to be treated as a joke by spammers.
" 31% of junk email still has brand names, even though brand marketers are obeying the law"
CAN-SPAM Study
Remember, many of the articles referenced herein will become archived and you might need to pay for some of them. I would pay for most of them.