Something I've never understood about spamers is that their massive attacks inevitably run through the server that is hosting your website and that's where something can be done. Why don't those servers, and the one before on the net too, massively delete spams. If you get thousands mails with same text - or just thousands mails within minutes, I think it is easy to guess it has to be deleted. Same for virus.

Yarp - author of P3DO Organizer for Poser