I think you should lighten up on going after a sponsor just because someone mails their program.
I think ever major sponsor allows legal mail traffic. The issue is that we don't know how the mail was collected. Now with Can-Spam, we can at least know if the mailing looks legit.
The only real way a sponsor knows if someone is spamming is by dealing with complaints. Christ, I even get complaints when I mail GFY webmasters, and that's DOUBLE OPT.
So give people a break, would you? And
here's a nice link that works perfect for me