Detections
Analytics

1.325 OL09-00-002425

Information

OL 9 must be configured to prevent unrestricted mail relaying.

GROUP ID: V-271763
RULE ID: SV-271763r1092001

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/27024

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CCI|CCI-000366, Rule-ID|SV-271763r1092001_rule, STIG-ID|OL09-00-002425, Vuln-ID|V-271763

Plugin: Unix

Control ID: f93cf5e2275c8db62e0ab4c0c7d2af9775fa243b01745f0409d560593348535a