CmdID / PowerShell / Cmdlets / Remove
Remove-BlockedConnector
Use the Remove-BlockedConnector cmdlet to unblock inbound connectors that have been detected as potentially compromised. Exchange PowerShell reference
From the Exchange PowerShell reference 2 parameters Its page in the reference
Parameters
-ConnectorIdThe ConnectorId parameter specifies the blocked connector that you want to unblock.-ReasonThe Reason parameter specifies comments about why you're unblocking the blocked connector.