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Stop form SPAM without using Captcha. PHP form > How to > Stop form SPAM without using Captcha Sooner or later your form may become a victim of people or programs that will try to send SPAM using your form.
With proper form data validation they won't succeed in sending SPAM from your form to other people, but you can end up getting a bunch of random junk form submissions yourself. Securimage CAPTCHA - Free PHP Captcha Script.