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Limit access to Exchange in a hybrid environment
Hello everyone, We have a hybrid environment running Exchange 2016. All our mailboxes have been moved to the cloud. The Exchange server is only used for management and relays yet it is still "expose...
It probably would be some combination of settings from those areas:
https://docs.microsoft.com/en-us/microsoft-365/enterprise/urls-and-ip-address-ranges?view=o365-worldwide
https://docs.microsoft.com/en-us/exchange/transport-routing?redirectedfrom=MSDN
