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It means that this command will test the message flow from the Mailbox1 server to the Mailbox2 server. Test-Mailflow Mailbox1 -TargetMailboxServer Mailbox2 These cmdlets determine the status of emails and ensure the users about its condition. These are PowerShell cmdlets (can be used in On-premises environment only) which help to diagnose the emails status and gives information about delivery, transport and mail-submissions. Users can tackle the issue in the latest version, Exchange 2016 by using Test-Mailflow cmdlets.
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This modification in host entries automatically restarts the Exchange transport services and resolves the mails receiving issue.
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