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27.3.2.2. Basic Postfix Configuration
By default, Postfix does not accept network connections from any host other than the local host. Perform the following steps as root to enable mail delivery for other hosts on the network:
- Edit the
/etc/postfix/main.cffile with a text editor, such asvi. - Uncomment the
mydomainline by removing the hash mark (#), and replace domain.tld with the domain the mail server is servicing, such asexample.com. - Uncomment the
myorigin = $mydomainline. - Uncomment the
myhostnameline, and replace host.domain.tld with the hostname for the machine. - Uncomment the
mydestination = $myhostname, localhost.$mydomainline. - Uncomment the
mynetworksline, and replace 168.100.189.0/28 with a valid network setting for hosts that can connect to the server. - Uncomment the
inet_interfaces = allline. - Comment the
inet_interfaces = localhostline. - Restart the
postfixservice.
Once these steps are complete, the host accepts outside emails for delivery.
Postfix has a large assortment of configuration options. One of the best ways to learn how to configure Postfix is to read the comments within the
/etc/postfix/main.cf file. Also, with Red Hat Enterprise Linux version 5.9, Postfix provides MySQL maps support which allows Postfix to use a MySQL database and configure various lookup tables for various operations over MySQL databases. For example, the virtual table for handling global mail redirection, the access table for controlling access to an SMTP server and the aliases table for managing system-wide mail redirection. Configuration details and examples, as well as other additional resources including information about LDAP and SpamAssassin integration are available online at http://www.postfix.org/.
