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XCCDF
Guide to the Secure Configuration of Red Hat Enterprise Linux 7
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Mail Server Software
Ensure Mail Transfer Agent is not Listening on any non-loopback Address
Ensure Mail Transfer Agent is not Listening on any non-loopback Address
An XCCDF Rule
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Ensure Mail Transfer Agent is not Listening on any non-loopback Address
Medium Severity
Mail Transfer Agents (MTA), such as sendmail and Postfix, are used to listen for incoming mail and transfer the messages to the appropriate user or mail server. If the system is not intended to be a mail server, it is recommended that the MTA be configured to only process local mail.