Forum weird spam attack
 

I'm getting hit with a TON of spam from a bunch of on line casinos and not sure what to do about it. In my inbox are a bunch of registration problem emails, and they are all from casinos (blackjack, gokkast, world casino online, 24option revue, to name a few). Not sure if I should just delete all these or if I should pull the ip addresses from them and put them in the ban list. Also not sure how to stop this. Anyone else having this problem?