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I think proxy based comments mostly spam. So what is the best way of determining proxy using comments ?

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It's possible, but it's unlikely that you succeed for comment spammers (and how do you separate them from legitimate proxy users?):

$proxy = $_SERVER['HTTP_X_FORWARDED_FOR'];
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well i think it is better to keep all of them away. thanks for answer. – MonsterMMORPG Jul 3 '11 at 0:03

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