Our GroupWise system has some external domains that we sync with and the MTA of one of the domains was moved to a new server two months ago. Every once in a while our link to their domain reverts to the old IP and the connection is lost. I can manually update the link configuration and get it back online. Their GW admin said they don't see the old IP anywhere in their system.

If I do a right-click on their external domain and go to GroupWise Utilities > Synchronize it reverts back to the old IP. When I do the synchronize is it actually polling their domain and getting that information? Where are the places that I or the other GW admin need to check to verify the IP settings?