How do I delete 22,000 User Accounts ?

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This Dreamhost thread was started by SwimmingLee on 2010-04-25 06:26:26:

Post Reply? I finally learned how to set up the “Captcha” and admin-approval for new registrations. But I still have 22,000 robo-spam users. How do I can them ? that is, throw them away. I looked through all the files in the forums directory and didn’t see any big compilation of usernames.

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