OL 9 must not have the sendmail package installed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-271466	OL09-00-000150	SV-271466r1091110_rule		Medium

Description

The sendmail software was not developed with security in mind, and its design prevents it from being effectively contained by SELinux. Postfix must be used instead.

STIG	Date
Oracle Linux 9 Security Technical Implementation Guide	2025-05-08

Details

Check Text (C-75516r1091108_chk)

Verify that OL 9 does not have the sendmail package installed with the following command:

$ dnf list --installed sendmail
Error: No matching Packages to list

If the "sendmail" package is installed, this is a finding.

Fix Text (F-75423r1091109_fix)

Remove the sendmail package with the following command:

$ sudo dnf remove sendmail