We've been spammed

I used to run a newsgroup. It regularly got spammed. I regularly got pissed.

I used to manage a mailing list. It regularly got spammed. I regularly got pissed.

This list has been spammed 8 times in the last two days by the same person. I wonder what the laws are concerning unsolicited advertisements in personal journals with fake return addresses. Any lawyers reading this? (The list is located in Virginia.)

If anyone sees spam in the comments, please e-mail me and I'll remove it. I'm off to find the owner of the website that was advertised.