Silkroad Online Forums

Maybe it's an idea to add a certain question which you have to answer when you register. The question doesn't matter, but spam bots are not programmed to choose an answer on that question. When you don't fill in the answer you can't register.
Just a question like. Are you a spambot? Yes - No

Maybe this works?

There's a phpbb2 mod called "The Humanizer" that does exactly that; the problem is that this forum already has quite a few mods on it, and the more mods you add the more bugs and problems you're likely to run into. It's been discussed before, and I think the fact it hasn't happened yet means it's not likely to. The mod team does a pretty good job anyway, considering the size of this place.

Yeah, but I'm on antoher forum and there they have a lot of mods and that forum is smaller than this one. But there aren't any bugs overthere.