nullmailer removes ssmtp

[lejmr]

Describe the bug
Turns out nullmailer is the only mailer considered by the role. Problem is this role doesn't provide a way how to configure it. I am ending up with a machine unable to send emails out.

To Reproduce

1. Remove postfix
2. Configure ssmtp
3. start this role against the server

Expected behavior
I am expecting role leaves ssmtp being configured on the system as it is, or role provides a way how to configure nullmailer.

Software (please complete the following information):

• Ansible Version: [e.g. 2.9.0]
• Role/Repo Version [e.g. 1.0.0, master]

[lejmr]

will try to make a pull-request to fix it.. doesn't seem the nullmailer is required by CIS itself.

[florianutz]

@lejmr you are right. The package is only installed because auditd otherwise install postfix. It requires an local mta. If you have an idea how we can check if a mta is already installed I would be happy about your contribution.