This plugin will make your blog more secure by adding rules which spambots will not pass.

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yaCAPTCHA is a CAPTCHA plugin for WordPress that helps you block comment spam from automated bots.

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Block spam comments definitely without settings or Captcha.

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CAPTCHA Solution is a CAPTCHA module intended to be called from other plugins. It is originally created for my Contact Form 7 plugin.

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SiteBrains blocks spam posts using a completely configurable set of rules. Both interactively as the user types and on our servers upon submission.

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A simple and efficient anti-spam plugin

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A simple to use plugin that helps you keep your WordPress site clean of spam comments.

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WP-Mail-Validator is an anti-spam plugin. It provides mail-address validation in 5 ways:

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