The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.
Postfix is configured as the default MTA on Oracle Linux. Although Postfix does not have as many features as Sendmail, it is easier to administer than Sendmail and its features are sufficient to meet the requirements of most installations. You should only use Sendmail if you want to use address re-writing rules or mail filters (milters) that are specific to Sendmail. Most mail filters function correctly with Postfix. If you do use Sendmail, disable or uninstall Postfix to avoid contention over network port usage.
Postfix has a modular design that consists of a master daemon and
several smaller processes. Postfix stores its configuration files
in the /etc/postfix directory, including:
-
access Specifies which hosts are allowed to connect to Postfix.
-
main.cf Contains global configuration options for Postfix.
-
master.cf Specifies how the Postfix master daemon and other Postfix processes interact to deliver email.
-
transport Specifies the mapping between destination email addresses and relay hosts.
By default, Postfix does not accept network connections from any
system other than the local host. To enable mail delivery for
other hosts, edit /etc/postfix/main.cf and
configure their domain, host name, and network information.
Restart the Postfix service after making any configuration changes:
# service postfix restart
For more information, see postfix(1) and other
Postfix manual pages, Section 16.5, “Forwarding Email”,
/usr/share/doc/postfix-,
and
http://www.postfix.org/documentation.html.
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