Hi all,
I now have exchange 2010 configured and mail flow is all good however I can see some senders sending out who are not part of the internal organisation therefore I must have configured the receive connector to be an open relay!
Am I correct in assuming it is the setting under Permission Groups called anonymous users (ticked) that is making it an open relay?
The problem is, the third party cloud spam filter company have said the connector MUST have anonymous users ticked.
Can anyone help please?