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Check the IP that the submission is from ($_SERVER['REMOTE_ADDR']) and store it in a database or a session variable and limit the number of times it can be requested from a single IP.
Or you can store the time that each request was made from any IP and check the time of each subsequent requests and make sure it is more than XX seconds.
I do this with comments on the CMS I built. It's known a "flood time" in CMS/Forum management parlance, so the system cannot get "flooded" with requests from a single source.
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Chris. ->> Links are advertising NOT optimising!! <<-
A foolish consistency is the hobgoblin of little minds
Thought for today:- I SEO the only industry where all the cowboys are Indians?
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