Stopping form spammers?

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I have a friend who is having problems with spam getting through his
web form at  The problem just started a
couple of months ago, and now spam outnumbers legitimate inquiries by
about 3 to 1.  He's using an ASP script for his form mail, and he
captures the browser, date/time stamp, and IP address of the source
and includes that info in the e-mails he receives, so he knows the
spam is coming through the form.  Is there any ASP script he can add
to block these lowlifes?  I've looked at some of the spam e-mails he's
received and compared them to legitimate inquiries, and I don't see
anything that would make the spam stand out.  Even the browser info
looks legit.


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