Difficult
As he is only getting 5/6 a day it is probably not an automated script doing it (which some simple CAPTCHA would stop). If the email address supplied by the spammer is the same (or similar) each time you could put something in the form processing to not send the feedback if that email address is used. You could also capture the IP address of the spammer and block that. Otherwise you can minimise the harm by stripping out the html tags from the comment field.
Regards
David
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