Tag Plugin: spambot
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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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Damn Spam
Damn Spam is a lightweight anti-spam plugin. Currently highly opinionated – it automatically sends any new comments with links to your spam inbox