You have a Microsoft Exchange Online tenant that uses an email domain named contoso.corn.
An in-caning email messages route through an third-party filtering service named Filter1 to connector named Connector'.
You discover that incoming messages contain headers that specify the source IP address as Filter1.
You to ensure that incoming email messages contain headers that specify source IP address of the original sender. The solution must prevent any charges to the service.
What should you do?
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