The problem is that there are some spamming affiliates that are hard to detect. They open up an affiliate account at xyz casino and submit a URL that looks legit. Once their aff account is given the thumbs up (most are in a moderation queue) they set their links up on xyz-casino-great-bonus-or-whatever.hk and turn the spam machine on. The only way to combat this is to contact the aff manager with these URLs. In most cases, the aff managers will shut down the affiliate's account. Aff managers CANNOT shut down specific URLs. This is no guarantee that the spammer won't open up another account and continue doing so. It's a problematic and painful situation.
My spam filter (Spam Assasin) nails most of these, and I just hit delete. The delete button is still the best way to deal with these things since spammers will always find a way to get their spam mails to you.
