[VikingBladeII]

It would also be advisable to setup an automatic e-mail ban for new accounts on accounts that are specifically banned for that purpose. Many "hackers" have many accounts, and when they find one free e-mail service that is not filtered out, they use it. By deliberately blocking them as they go, they will have a much harder time. Though there are still loop-holes, this would be effective to an extent. I suggest you also upgrade the ban system with a more dynamic defense, as it is can be largely ineffective for a semi-determined player.