It is illegal to send spam without a working unsub link. It is illegal to email you unless you have opted in, or have "an existing business relationship" with him.
A simple look at the full headers of his email and then reporting him to the ISP/host he undoubtedly doesn't have permission to to do bulk email from should do the trick. Especially if the ISP/host receives *several* complaints (hint hint).
Instructions on how to do this for n00bs is here
http://spam.abuse.net/userhelp/howtocomplain.shtml