Seriously guys, you really need a stronger anti-spam filter... lately we saw a lot of freakin hack ads, and now this bot who spammed 87 messages in few minutes? View Profile: Prolkilky - Top Eleven Forum

Akismet Anti-Spam - vBulletin.org Forum
Anti-Spam Methods and Resources - vBulletin.org Forum

In a hardcore way, you can also block his provider/proxy from the forum and the game