I use an extreme measure because so many of our members were ignoring the rules altogether and causing trouble.
I have a phpESP survey set up as a quick 10-question quiz, also asking for registered username and password. The link and explanation go out on the user registration confirmation e-mail. The results of the quiz are the forwarded to 4 of us on the admin/super-mod team to review and approve or not. If approved, the user is moved to a group with posting permissions.
Yes, it takes more time, but we have a very active group of people who know what we allow and what we don't allow.
It's just too much work for most spammers to go through.
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