http://pandalabs.pandasecurity.com/archive/Spam-in-PHP-forums-_2800_II_2900_.aspxOne reader has pointed that although requiring a user to register is a good idea, some bots are able to do so, and has sent some "tricks" that administrators should use to prevent bots from registering in the forums. First you should use securityenCommunityServer 2.1 SP2 (Build: 61120.2)