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Mark PlierFlag for United States of America

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Trying to stop an Attacker...

For the past couple of months, an attacker has been sending my company emails trying to get us to install a RAT. Somehow, he knows the services we use (VoIP providers, etc) and sends emails as them. I've traced his originating IP using the email header data and he traces back to a server rental farm in Japan. I've reported him to them 3 times, but to no avail. Any ideas on how to stop this guy? We cant block the domains, as they are legitimate domains we receive emails from.
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I'm really liking the idea of blocking by header as they are all coming from the same IP (the one hosted server)

How would I go about this in Exchange? We are hosted with Office 365
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