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RHEL-10-200692 - RHEL 10 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 to send spam or for other unauthorized activity.Solution
Configure RHEL 10 so that the postfix configuration file restricts 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_10_V1R1_STIG.zip
Item Details
Audit Name: DISA Red Hat Enterprise Linux 10 STIG v1r1
Category: CONFIGURATION MANAGEMENT
References: 800-53|CM-7a., CAT|II, CCI|CCI-000381, Rule-ID|SV-280999r1165352_rule, STIG-ID|RHEL-10-200692, Vuln-ID|V-280999
Plugin: Unix
Control ID: eff9987e9659bc1d5e32e7502bd5a80d8f9d9f2552f1ec9f254e1e0a3cab4b97