do a display of full header information
on the email, get the "originating IP" address, that'll give you where the twit is, unless he's using an "anon" remailer. Even if he is, fire off an email to "Abuse@whateverISPshowsup.com", along with a copy of the email, it'll get that tcp-ip addy banned from sending any more.
We are not primarily on earth to see through one another, but to see one another through
Some people are like slinkies: not really good for anything... but you can't help laughing when you push them down the stairs