Routing outbound mail to the firewall

Your Simple Mail Transfer Protocol (SMTP) server must route mail for Internet users to the firewall. To ensure this, you must configure the SMTP attributes in the firewall home AS/400 system to point to the firewall as the mail router. You must enter the name of the firewall in the Mail router field. This tells the SMTP daemon where to forward mail that it cannot deliver itself.

You must enter *YES in the Firewall field. This tells the SMTP daemon that it is located behind a firewall. The SMTP daemon looks up where to send mail. When the daemon is behind a firewall, it may resolve a name to a server located on the other side of the firewall. When this occurs, the daemon tries to send the mail directly to the server. Because you configure the firewall to block these packets, the daemon cannot make the necessary connection. If the firewall field says *YES, the daemon forwards the mail to the mail router that you specify in the Mail router field. The daemon returns a "non-deliverable" message to the sender if you do not configure these fields correctly.

To change the attributes so that your server routes the mail properly, follow these steps:

1. On an AS/400 command line, type

   CHGSMTPA
   

   and press Enter to view the Change SMTP Attributes display.

2. In the Mail router field, type the fully qualified firewall host name, for example, firewall.private.company.com.
3. In the Firewall field, type the value *YES.
4. Press Enter to save your changes.

After you make your SMTP attribute changes, you are ready to vary on the firewall network server description.