spammer using feedback form to spam

I run a national directory of a professional group that has a membership database of several thousand. You can search the directory for a professional in your area and respond to them via a feedback form.

However a spammer has been hitting my directory lately, using the feedback form to try to sell things to my group. By the time I discover it and block his IP with .htaccess he has already spammed a few hundred people. Then in a few days he gets another ISP and starts again, I block him again, etc. It is an ongoing process.

What I need is a forms processing script that will reject a sender based on the content of their message they insert into the form. Since this spammer uses certain words in his spam that would not ordinarily be used by legitimate responders, I could easily block him with a few keywords that he uses in his spam messages.

Any one know if such a script exists? PHP, Perl, it doesn't matter, as long as it will work with Linux.

Thanks!

 

 

 

 

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