My client’s email was blacklisted for sending spam. He had his computer scanned for malware; All clean. His web hosting company set him up on a new email server, all was fine for a couple of days, and then the problem started again. His hosting company says the problem is coming from the form being used on his site — something inside the form itself. I have no idea where to even begin to look for the problem, or how to get the form to stop sending spam.
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