Routing outbound via Exchange Online

Copper Contributor

Hi All, 


I have a requirement to route outbound email to internet recipients through Exchange Online. There is no Hybrid configured between the environments and the mail flow we require is as per the flow below: 


Exchange 2007 --> Sophos UTM --> Exchange Online --> ForcePoint --> Internet Recipient


To achieve the above flow we are looking to implement TLS between Sophos and Exchange Online using TLS1.2 (which is not possible on Exchange 2007). 


We will have an inbound connector on Exchange Online to accept email from the Sophos IP address and verify the TLS certificate and the domain of the sender will be verified in the Office 365 tenant. 


Wondering if anyone has achieved a similar setup in the past and if there are any considerations other than what I mentioned above? 




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