RHEL 9 must not have the sendmail package installed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-257827	RHEL-09-215020	SV-257827r925468_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. Satisfies: SRG-OS-000480-GPOS-00227, SRG-OS-000095-GPOS-00049

STIG	Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide	2023-12-01

Details

Check Text ( C-61568r925466_chk )
Verify that the sendmail package is not installed with the following command: $ sudo dnf list --installed sendmail Error: No matching Packages to list If the "sendmail" package is installed, this is a finding.

Fix Text (F-61492r925467_fix)
Remove the sendmail package with the following command: $ sudo dnf remove sendmail