How are SMTP Routes Configured on the SA100/ SA400/ vCollaboration
The smtproutes file gets populated by the file transfer service (FTService) on the UCB. It picks the information form the vmservers table. When you modify any one of the platform components (Administration > Application/Servers > Platform Equipment), the FTService gets the corresponding trigger and subsequently it updates the smtproutes file.
The SMTP routes will always show .com as this information is hard-coded in the code.