I have a scheduler application that sends out success/failure emails. the emails deliver with no issue to internal people, it is when it needs to send out that the intermittent "unable to relay" error happens. I have been informed to add the IP address of the scheduling server to the receive connectors and possibly add extra permission to the authenticated users group. I dont want to open the server up to spam. The outlook client email deliver with no issues to either local or outside the domain. so I am able to relay through that approach. Has anyone had a similar issue. what was the fix adding the IP address tothe connectors or adding permission to an ADS group or both.