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crossing up the spambots is actually the relatively easy part. But there's still a fair number of human spammers in China and India especially.

you might find this helpful. Like I said I have a lot more experience with vBulletin, but we still do run a couple of PHP BB forums. I can't stand them myself, extremely primitive software by...

well, yes and no. If you have the luxury of using IP banning at your own discretion, and you're willing to block all of Asia as well as Russia and the former Soviet republics, plus Nigeria, you can...

Bots stroll right by most every CAPTCHA now. Use instructions that are easy for humans, but impossible for bots, such as: "At the top left of the page there is a header graphic of the site's name....

I forgot to mention Nigeria. All cellphone/handheld spam comes from there.

I can give you tons of advice, but unfortunately you're not running vBulletin. Your options are considerably more limited with PHP BB. The first thing I can tell you is, virtually all forum spam...