No Email Notification possible

spooky: Four different methods just to deliver an email, where one solution is just for testing purposes and is never used by checkmk itself.

Why is this not streamlined to one simple fully configurable and OS-independent solution?
e.g. the already delivered heirloom-mailx or python smtplib?

What solution can i choose to have a different smtp setup in checkmk than my local OS?
Local mails have to be send differently than mails from checkmk. Different FROM-Adress, different smtp-server, different authentication mechanisms.