Tenger Plugin: spambots
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PRyC WP: AntiSPAM (without CAPTCHA)
Block SPAM without any type of CAPTCHA – plugin add "HoneyTrap" (and a few other tricks) for comment form to block SPAMbots.
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ThreatPoint Email Validator
This plugin validates email in realtime using live connections and aggregated data, by leveraging the ThreatPoint email verification API service.