AlmaLinux OS 9 must not have the sendmail package installed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-269336	ALMA-09-028950	SV-269336r1050218_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
CloudLinux AlmaLinux OS 9 Security Technical Implementation Guide	2025-05-22

Details

Check Text (C-73367r1048384_chk)

Verify that the sendmail package is not 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-73268r1048385_fix)

Remove the sendmail package with the following command:

$ dnf remove sendmail