Did you pass math? is a simple but effective anti-spam plugin for Wordpress, which asks commenters to answer a simple maths question in order to post a comment, for example “what is the sum of 2 and 9?”.
The plugin is XHTML 1.0 Strict and has many languages to chose from, including English, German, French, Malay and Polish. There is no need to configure, simply upload to your plugin folder. A perfect way to make sure no robots get through. Ever.
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