Sending e-mail through a router or firewall or hub

An e-mail router is an intermediate system that Simple Message Transfer Protocol (SMTP) delivers mail to when it cannot locate the recipient's exact IP address.

A mailhub is a known submission server that allows this server to send e-mail. Typically if you have an Internet Service Provider (ISP) they will provide you a hub. If a mailhub is set all non-local email will be sent there, no e-mail will be delivered directly. A mailhub is typically an MX (mail exchanger) DNS (Domain Name Server) record, however it can be just a hostname.

Setting the mailhub:

To set the mailhub, follow these steps:

From IBM® Navigator for i, expand Network > Servers and click TCP/IP Servers.
Right-click SMTP and select Properties.
Click the General tab.
Enter the Forwarding mailhub domain

Setting the mailrouter and firewall:

The e-mail router routes the e-mail to the IP address or to another router. Route your outgoing e-mail to an alternative system if your local server fails to deliver the e-mail to the system. If you have a firewall, you can use the firewall as your router. Only directory type *SDD supports a mailrouter and the firewall feature. The preferred method is to have a mailhub.

Before you follow these steps to configure a router, see the Prerequisites for an e-mail router.

To set the router, follow these steps:

From IBM Navigator for i, expand Network > Servers and click TCP/IP Servers
Right-click SMTP and select Properties.
Click the General tab.
Enter the name of the firewall; for example, FWAS400.company.com in the Mail Router field.
Select Forward outgoing mail to router through firewall.

To route e-mail through a firewall, follow these steps:

From IBM Navigator for i, expand Network > Servers and click TCP/IP Servers.
Right-click SMTP and select Properties.
Click the General tab.
Enter the name of the firewall; for example, FWAS400.company.com in the Mail Router field.
Select Forward outgoing mail to router through firewall.