پلگ ان ٽيگ: registration spam
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My Private Site – Make Your Whole Site Private, Force Login & Block Registration Spam
Make your WordPress site private in one click, block registration spam, and clean up existing spam accounts with staged safeguards that protect online …
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SpamJam
Stop 99% of spam comments and registrations automatically. Zero captchas, zero hassle. Your visitors won't even notice it's there.