Hi,
I have enabled "Require that all Sender are authenticated" for a DG group to restrict external email coming to this address but it is not working.
I have tested this with different DG and have same issue.
Also when I restrict the DG to accept email from specified users in our domain it works fine internalyy and block it for usrs which are not in the list but still accept email from external domain.
Does this have anything to do with "Receiver connectors"?