Run the following command to determine the current status of the "postfix" service:
# service postfix status
If the service is enabled, it should return the following:
postfix is running...
If the service is not enabled, this is a finding.
Fix Text (F-43618r1_fix)
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: