I have just pruned about 3 months worth of spam users (500+ users) after some board neglect for a period of months. I've tried changing the Q&A to no avail. They are coming in. What is the latest anti-spam counter measurements.
A good Q&A like what is the name of this site? Or something that's on your site would work. Or use the extension sortables captcha in my sig. You should also moderate all first time posters. That way a spam post never sees the light of day.