I know of several solutions that could be implemented to "bulletproof" your forum, but it won't be cheap. If you're willing to spend upwards of $200 to get your forum secured, then PM me about it and we'll talk.
I had a problem with this a couple years ago. I stopped the spam to (at least) a controllable level by adding human verification (some random question that only people in my community would get) and also adding a couple spam blocking PHPBB mods. The spam for me, when I had this directory, was so bad that it was DDOSing my internet gateway and causing it to reset. Doing those two actions fixed my problem and then just left me with the spam clean up. Hope that helps.
This sounds like the solution I want, something fairly simple, install a few mods. Dont want to spend anywhere near $200 dollars. Was thinking more like $10.. about an hours work
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