For the ClassiPress forum I use a free software called phpBB. Up until a few weeks ago, I wasn’t having any problems with forum spam but now it seems the bots have me zeroed in. PhpBB does come with a simple captcha-style anti-bot option but for some reason it doesn’t seem to work very well. I have also enabled a feature to require email verification by clicking on a link before their account becomes active.They beat that too.
I must say, the bot engines out there today are pretty damn smart. They have figured out a way to automate and bypass both of these security measures so they can post spammy links to their products or just be a nuisance. Luckily the spammy forum posts haven’t been porn…at least not yet.