But first, let's cover some of the fundamental Exchange 2013 concepts that apply here.
The “Default Frontend” receive connector has remote network settings equivalent to “anything”.
The “Relay” connector we just created has remote network settings that list specific IP addresses.
So, if two SMTP connections are inbound, one from 192.168.0.180 and the other from 192.168.0.181, the server knows to handle 192.168.0.181 with the “Relay” connector as it is the more specific match, and handle the other connection with the “Default Frontend” connector.
With the relay connector in place the ongoing management is simple.
Paul is a Microsoft MVP for Office Servers and Services.
He works as a consultant, writer, and trainer specializing in Office 365 and Exchange Server.
Simply double-click the downloaded file to install it.
Update Star Free and Update Star Premium come with the same installer.
Where previously the server responded with “550 5.7.1 Unable to relay”, now an SMTP connection from the IP address 192.168.0.181 is allowed to relay successfully.