You can configure an alternate GWIA for a domain, so that if the domain’s primary GWIA goes down, the MTA can fail over to another GWIA in your GroupWise system until the primary GWIA is up and running again. This feature is especially useful in large GroupWise systems with multiple GWIAs that handle a lot of Internet messages.
In the GroupWise Admin console, browse to and click the Domain.
Click the Internet Addressing tab and locate the Internet Agent for Outbound SMTP/MIME Messages section.
Click Override.
In the Alternate Internet Agent for Outbound SMTP/MIME Messages field, select a GWIA as an alternate for this domain.
Click Save, then click Close to return to the main Admin console window.
The MTA always tries to transfer outbound Internet messages to the primary GWIA first, so after an outage the primary GWIA automatically resumes its normal processing for the domain.