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Perhaps if you can, send him a message with an unsubscribe link in it to remove him from any future mailings. And keep a copy of that, then remove his email from your auto responder. That's the best I can think of.
If he does post things on other forums, you may have a slander case. Notify the cyberspace police. They work with local authorities in your and other areas. You can inquire if you may have a case.
Best wishes.
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