Summary
This update makes the Validate-MailFlowThroughFrontDoor command hidden in Microsoft Exchange Server 2019 and Exchange Server 2016. It is for internal use only.
How to get this update
To get this update, install one of the following updates:
The Cumulative Update 3 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.
The Cumulative Update 14 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.
References
Learn about the terminology that Microsoft uses to describe software updates.