I have SBS2008 and Exchange 2007 on x.x.x.10
I have the standard setup to allow certain IP's on the LAN to relay through a second IP x.x.x.11, I have some LAN IPs set to require Authorization and other LAN IP's for No Authorization required.
The x.x.x.11 is simply a second IP on the same NIC that x.x.x.10 was setup on.
The router is set to allow port 25 through to x.x.x.10
All is working fine.
I have been wondering for a while which IP is the send connectors using x.x.x.10 or x.x.x.11?
I have a feeling it uses the x.x.x.10, the lower numbered IP, but there don't seem to be any settings to define which the send connector uses. I have had a look for guidance but haven't found anything relevant.