I was miserably searching for the ways to stop the spammers and automated bots in my phpBB forum - www.indianitforum.com. spammers were hitting our forum by posting a dozen of junks daily. phpBB is having a reasonable good captcha, but it was broken by the intelligent spam bots. my search ends in a simple yet logical solution. the bots are smart enough to break any captchas - but still they are machines ( Thanks to you god, for not giving them the intelligence ) and they can't really THINK! - so the only way to stop them is to ask something that can be answered by a genuine human. and finally it worked....i added a simple question like whats the sum of x + y ? and i tweaked the php code to verify the result and allow the person to register. a million thanks to 'Marshalrusty' for giving the hints on the tweaks. i'm happy to help you on regard of this, if you want any...
