CmdID / PowerShell / Cmdlets / Get
Get-OutboundConnectorReport
Use the Get-OutboundConnectorReport cmdlet to view the Outbound connectors that are used to deliver mail to specific domains. Exchange PowerShell reference
From the Exchange PowerShell reference 2 parameters Its page in the reference
Parameters
-DomainThe Domain parameter specifies the domain you want to test.-ProbeTagThis parameter is reserved for internal Microsoft use.