The problem isn't that. vBulletin has built in Image Verification things, but version 3.5.x doesn't have support for garbling up the text in random ways as much as 3.6.x does. We currently use Image Verification, but the spambots can currently read the text correctly using some pretty cool OCR techniques. Currently the Email-Registration system seems to be holding them at bay. (No spams in a few days so far.)
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