In a GroupWise environment, the P.O. tab displays information about your post offices, such as IP address and, port. This information is created and maintained by the Address Book Sync process as described in.
Note: By default, the individual IP addresses and port numbers for each POA are set to the value of those for the POA used by the Address Book Sync process. You do not need to manually change all addresses and ports to the correct values for each individual POA since GroupWise redirection will automatically reroute Netmail Archive requests for accounts to the appropriate POA. Entering the correct addresses and port numbers, however, will avoid the need to rely on GroupWise redirection.