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---- Frustrated with Spambots Coming In through Webmail Forms
tedster - 5:43 pm on Aug 11, 2008 (gmt 0)Thread source:: http://www.webmasterworld.com/html/3720387.htm
Another similar approach uses external css to HIDE an unneeded form input. Anytime that box is filled in, it's a spambot so you just throw the submission out.
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