RHEL 9 must have the s-nail package installed.

The "s-nail" package provides the mail command required to allow sending email notifications of unauthorized configuration changes to designated personnel.

Verify that RHEL 9 is configured to allow sending email notifications.

Note: The "s-nail" package provides the "mail" command that is used to send email messages.

Verify that the "s-nail" package is installed on the system:

$ dnf list --installed s-nail

s-nail.x86_64 14.9.22-6.el9

If "s-nail" package is not installed, this is a finding.

The s-nail package can be installed with the following command:

$ sudo dnf install s-nail