OL 9 must not have the sendmail package installed.

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.

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.

Remove the sendmail package with the following command:

$ sudo dnf remove sendmail