I have a Xeams server running on a dual-nic system and there were messages being logged in OutboundAuditTrailFailure.log indicating that the message was being rejected because of the IP being used.   The server has both a commercial and residential broadband connection and the commercial connection is the one the email server is configured to use.  

The commercial connection has an private IP or 192.168.0.2 and the residential connection has an IP address of 192.168.1.2

I have added the line outbound.smtp.binding.ip=192.168.0.2 to the \config\service.properties file (which I did not have to create) but email is still being rejected because it is being sent from the wrong IP address.

Any advice on what I can check, I would appreciate it.   Thank you.