Antispam Modules is an option, but seems like it is not fully developed. http://drupal.org/project/antispam
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Why do not try Keypic? Being an alternative to anoying CAPTCHA (reCAPTCHA) it saves users from proving they are humen and provides a reliable anti spam protection. No CAPTCHA, No Spam!
By the way, currently submitting this comment I should to recognize and type characters. Hate!
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