If somebody has an email on their website asking for comments or suggestions they don't get spam. Every email they get they asked for. If you send out a link request to only these types of email addresses you should be able to prove to your isp that the email was not spam. It would be interesting to get one of those email address CD's and send an email to each one of their isp's and say that they were spamming a few times I wonder how many people you could get banned. It seems like ISP's assume all compaints are legit.