I’ve now been running this plugin for about two weeks, and the RBL New User Registration check has prevented over 200 spam registrations. Registrations that would otherwise have made it through all of the aforementioned checks, since the RBL plugin collects the username, which means the registrant had to have gotten to and completed the registration form.
Over 200 spam registrations blocked, and approximately 10-15 total false positives (which could probably be remedied by removing a few of the more aggressive RBL servers from my list.) I can firmly state that the 10-15 false positives, compared to the 60 spam registrations a day I was getting, falls into the win column. Whitelisting an IP takes just a few seconds, so its not a big deal.
The ultimate outcome – these plugins combined have, for now, allowed me to turn off manual registration approval completely – with ZERO spammers making it through the blockades. My users are happier, and I’m happier.
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