How to use GWIA to Route Mail Messages When Two Mail Systems Share the Same Domain Name

  • 7024791
  • 24-Aug-2020
  • 24-Aug-2020


GroupWise 18
GroupWise 2014


It is common when two companies merge that it is unlikely that they would be using the same type of mail system.  In order to facilitate the changing of the domain name used by the second system to the domain name used by the GroupWise system, it will be necessary to route an inbound message to the system that is merging into the GroupWise system.  The scenario will be similar to the one listed:

1.  company buys
2. uses GroupWise and uses a different email system
3. will be changing their domain name to, but will want to continue to use their own mail system until a migration is undertaken


To resolve this scenario, the best procedure will be to point the MX record for mail destined to at the GWIA that processes mail for  Within the GroupWise Administrator, the option to "Forward Undeliverable Inbound Messages to Host" should point at the SMTP server for the system that hosts

When an internet email message comes into and 'user' does not exist in the GroupWise system, then the message is still accepted, but then it is forwarded to the host specified.  If the message is addressed to, then the message is rejected immediately by the GWIA since that domain name is not serviced by the GWIA.