For this spam control, I have a suggestion:

Why can't this forum "self moderate" by utilizing this "Report post" button? My idea is that once enough (something like 3 or more) users "votes" for a post as spam/inappropriate, it would be removed automatically. Requiring this "more than one" report should prevent the misuse of this feature. And, if the "spam versus good posts ratio" of any user increase over 30% the user gets banned permanently. (Until moderator decides to remove the ban.)

Just today there was one new poster registered and he has already posted close to ten spam messages... I already reported couple of the posts and asked moderator to ban the user...

All these spammers are making me mad!

EDIT: Today's spammer posts have now been removed, than God...