Detections
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1.177 RHEL-09-252050

Information

RHEL 9 must be configured to prevent unrestricted mail relaying.

GROUP ID: V-257951
RULE ID: SV-257951r1014843

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

Modify the postfix configuration 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://workbench.cisecurity.org/benchmarks/22008

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-257951r1014843_rule, STIG-ID|RHEL-09-252050, Vuln-ID|V-257951

Plugin: Unix

Control ID: 5ebd9dd7dbc053bdd3f51febde398b226bd937c0c7b7dc777100c18adeb82e3f