I do not wish to receive this type of mail. I also received a magazine from BetUs.com, but they have a phone number to call to be removed from their mailing list. (Which hasn't worked so far - I've called twice.) The Insiders Betting digest has no phone number, no mailing address, and their website has no contact information. Their postal permit is Waseca. MN Permit #151.
I hope you can stop them from mailing to persons who are offended by this type of material.