In some environments there are applications or even servers who wants to relay off the Exchange 2007 server. Default no servers are authenticated to relay, until you create a new Receive Connector.
Let’s have a look on that…
First off all, open your Exchange Management Console, Server Configuration, Hub Transport, Receive Connectors. Here we going to add a new custom Receive Connector, calling Relay Connector.
In this example the following servers are authenticated to relay of the Exchange 2007 Server.
(172.16.1.19, 172.16.1.20 and the range 172.16.1.200 – 172.16.1.210)