RHEL 9 must not have the sendmail package installed.

Documentable No

Rule ID SV-257827r1044892_rule

CCI References

CCI-000381

Discussion

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

Check Procedure

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 Action

Remove the sendmail package with the following command:

$ sudo dnf remove sendmail