CmdID

CmdID / PowerShell / Cmdlets / Get

Get-SystemMessage

Use the Get-SystemMessage cmdlet to view default or custom system messages. Exchange PowerShell reference

From the Exchange PowerShell reference 3 parameters Its page in the reference

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Parameters

3 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the custom system message that you want to view.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-OriginalThe Original switch filters the results by the default system messages that are included with Exchange.