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RHEL-08-040290 - RHEL 8 must be configured to prevent unrestricted mail relaying.
Information
If unrestricted mail relaying is permitted, unauthorized senders could use this host as a mail relay for the purpose of sending spam or other unauthorized activity.Solution
If "postfix" is installed, modify the "/etc/postfix/main.cf" file to restrict client connections to the local network with the following command:$ sudo postconf -e 'smtpd_client_restrictions = permit_mynetworks,reject'
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_RHEL_8_V2R7_STIG.zip
Item Details
Audit Name: DISA Red Hat Enterprise Linux 8 STIG v2r7
Category: CONFIGURATION MANAGEMENT
References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-230550r1017312_rule, STIG-ID|RHEL-08-040290, Vuln-ID|V-230550
Plugin: Unix
Control ID: 38d2e8c7c217e4208b64f838069c3202b3ac86734068549df729019b4549184e