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11.3.2.2. Basic Postfix Configuration

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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.cf file with a text editor, such as vi.
  • Uncomment the mydomain line by removing the hash mark (#), and replace domain.tld with the domain the mail server is servicing, such as example.com.
  • Uncomment the myorigin = $mydomain line.
  • Uncomment the myhostname line, and replace host.domain.tld with the hostname for the machine.
  • Uncomment the mydestination = $myhostname, localhost.$mydomain line.
  • Uncomment the mynetworks line, and replace 168.100.189.0/28 with a valid network setting for hosts that can connect to the server.
  • Uncomment the inet_interfaces = all line.
  • Restart the postfix service.
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 /etc/postfix/main.cf. Additional resources including information about LDAP and SpamAssassin integration are available online at http://www.postfix.org/.
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