Dear Clangallacher,
Possibly once in iWT forum, I suggested you to use any directory script instead of using your own script.
In your script, you have no validation before form submission - anyone can add any value to any field, you have no Captcha - just a simple javascript can submit thousands of requests in a minute. Spammer are everywhere ... they just want a shortcoming in the script.
If you really want to stop spamming, at least add any captcha script to your submission form ... as see the result.
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