When I had vB3, I used the NoSpam! mod using the Q/A feature...it *really* cut the spam down to almost nothing. The reCAPTCHA option never worked well enough in my forum.
I found that NoSpam! is not compatible with vB4, but I saw that vB4 actually has that Q/A feature integrated now. My board is shut down now while I work on some things but I will report back on the results once I reopen it.
The key is to make the questions hard enough to throw off the bots (and change them regularly as well). "What color is the sky? blue" is too easy. Maybe ask a question that pertains to your forum's subject area?
Just a thought...
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