An Email gateway can be added to a selected domain by using the following procedure;

Click on the "Create" button (found on the toolbar of the 'Message Gateways' tab);
A new window will now open titled "Message Gateway – New";

At the prompt "Type:", select "EMAIL", and the window will be updated as follows;
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After you have completed entering the gateway details you will be ready to configure the gateway.
Click on the Edit button () , and a new window titled "SMTP Gateway" will open;
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You will now return to the window titled "Message Gateway – New", supply any description you may required then click "Save" to create the email gateway.
Once the email gateway has been configured it can be tested by using the context menu option "Test";

A new window will open that can be used to send a message through the newly created email gateway;
