Detections
Analytics

1.359 OL08-00-040290

Information

OL 8 must be configured to prevent unrestricted mail relaying.

GROUP ID: V-248895
RULE ID: SV-248895r991589

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

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://workbench.cisecurity.org/benchmarks/23791

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-248895r991589_rule, STIG-ID|OL08-00-040290, Vuln-ID|V-248895

Plugin: Unix

Control ID: 4c2be2f42f8b3ed7c3ccf4738bbedf5be24deb350eaf441c7f2ed0d9535617b6