Messaging Server and Recently Added Internet Domains
By Joesciallo-Oracle on Jul 19, 2007
New Internet domains get created from time to time, but be aware that older versions of Messaging Server aren't necessarily 'aware' of them. You might see this manifested as unknown host or domain errors reported by the MTA.
The MTA uses the internet.rules file, but this can become out of date as new domains are created. If you are trying to route mail to one of these new domains that isn't in your internet.rules file, refer to the following msg.wikidoc.info entry (or think about upgrading to a more recent version of Messaging Server):