Enable Postfix Service The Postfix mail transfer agent is used for local mail delivery within the system. The default configuration only listens for connections to the default SMTP port (port 25) on the loopback interface (127.0.0.1). It is recommended to leave this service enabled for local mail delivery. The 'postfix' service can be enabled with the following command: '$ sudo systemctl enable postfix' Local mail delivery is essential to some system maintenance and notification tasks. Fix: # # Enable postfix.service for all systemd targets # systemctl enable postfix.service # # Start postfix.service if not currently running # systemctl start postfix.service oval:org.secpod.oval:def:48358 oval:org.secpod.oval:def:48977 oval:org.secpod.oval:def:48358 SCAP Repo OVAL Definition 2018-11-20