No Email Notification possible

[kkloesener (Konrad Klösener)]

So you say, that Checkmk provides this extra mailprogram just to make sure you can test your locally installed sendmail program. That seems very odd to me.

@andreas-doehler

This is only to test if your system can send mail.
If you read the mentioned manual article correctly you will see that this is only to verify that your system MTA is working as expected.
From the start of the article.

For the successful sending of emails, your Checkmk server must 
have a functioning SMTP-server configuration. Depending on your 
Linux distribution, this could utilize, for example, Postfix, Qmail, 
Exim, or Nullmailer. The configuration will be implemented with 
your Linux distribution’s resources.

So i would need a complete setup of Postfix or other additional software (MTA) on every instance, make sure that everything is really secure and can not be used for bad things just to provide a solution to send mail from MUA, if OMD already delivers all necessary parts in its distribution and only would need to use this toolset?

How is this problem solved in containerized environments where i do not have the possibility to install such tools?