Detections
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OL09-00-002425 - OL 9 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

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://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Oracle_Linux_9_V1R5_STIG.zip

Item Details

Category: CONFIGURATION MANAGEMENT

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

Plugin: Unix

Control ID: 254621b37f727df1041dc7e8bae594001d0ca3112e7bf17b904f0bd4b9108306