Harvester Project joined

I've joined and configured this site to work with the SpywareInfo Harvester Project which tracks spammers by getting their ip address from spam emails they've sent. The two spams that I have received to this new domain so far (one today and one yesterday) have both been sent by crawling the website and sending emails to a particular email address unique to their ip address. These ip's are now blocked from the entire website (although I need to think whether thats the best thing to do with these ip's or not)