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.
Check
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
Remove the sendmail package with the following command: