What do you mean is it exempt? It still has to comply with all the rules set up, ie: a way to opt-out, a time/date/IP stamp of when they opted in, etc
If you have any questions about the letter of the law, I suggest you read
http://www.spamlaws.com/federal/108s877.html or do a Google search, and educate yourself:
http://www.google.com/search?hl=en&i...=Google+Search