This guy is my hero.
This week, a spammer chose to fake his "from:" address on some penis enlargement spam with one of my domains. I've been receiving a steady stream of bounced messages, but thankfully no irate emails from those spammed. I've reported each and every spam to spamcop, contacted the hosts and network providers for the spamvertised websites, but haven't heard anything back.
The only way to stop spamming is to make it economically unfeasible to continue doing it. If that requires suits against spammers, so be it.