1) Sign into the top level admin account for the server you are working with.

2) Click the Setting tab in the top left corner of the screen then click Gateways/Failover.

3) Locate and click the gateway you are working with. The location will depend on the type of gateway you are working with.

4) A list of any other domains that are in the gateway should display, scroll to the bottom of the list and add the domain you are working with in the Domain text box.

5) Scroll back up to the top of the screen and click Save.