This topic tells what you should do before you configure an e-mail
router.
Before you configure an e-mail router, consider the following aspects:
- The intermediate server does not have to be an iSeries™ server. The mail router only
requires a host table that contains all host servers to which it needs to
route e-mail. If an iSeries server is the mail router, it does not require
any particular system level.
- You can set up only one intermediate server for routing between the source
and target server. You cannot nest mail routers.
- Simple Mail Transfer Protocol (SMTP) must be able to get an IP address
for the mail router when it starts, either from the local host table or through
the Domain Name System (DNS) server. If SMTP cannot get an IP address for
the mail router, then SMTP runs without using a router.
- The SMTP client firewall support uses the mail router
to forward e-mail that is destined for a host outside the local (protected)
domain. In order to deliver e-mail, the mail router must be a server that
is authorized to forward e-mail through the firewall. Also, mail recipients
whose domain is not on the iSeries server go through the router when you turn
on the SMTP firewall support. i5/OS™ V5R1 and later supports multiple
local domains. You can configure multiple domains that do not send mail through
the firewall.