LoL, check out this post
http://www.bluehatseo.com/dealing-wi...e-pesky-narks/
My favourite part...
First Deal With Your Hosting
Depending on your hosting, sometimes you can point domains to yourself. IE. point to your hosting?s IP on your primary domain and then all your secondary domains point to ns1.primarydomain.com and ns2.primarydomain.com for the name servers. If this isn?t the case tell your hosting that you used to run a hosting company and would like to archive your website with them along with your clients. Kind of a move over to their servers if you will. Then make a fake hosting company.
Make a nice little website for it and a domain(myawesomehost.com) and be sure to make it unusuable. Perhaps a small disclaimer saying you have shut down and are no longer taking new accounts will suffice. Then put it up on the hosting/vps/whatever. Your hosting company will set in the dns records the nameserver. Then you point that domain to itself using its own ip. If you don?t know how to do this just check with Godaddy tutorial or ask someone. Its very easy. Then have all your spam sites point to the fake hosting site(the ns1.fakehostingsite.com and ns2.fakehostingsite.com).
This will cause the narks to lookup your site in the whois info and grab the hosting information from the nameservers. They will go to the contact form for the fake hosting site of yours and email them a harsh letter saying they should delete your account for spam. You are welcome to collect these emails for future laughs.
Your hosting is never the wiser and still happy because they don?t have to hear about your complaints."