Small update, I got it to work 
These are the crucial settings:
You need to enter the first part of the from email here, the rest (@www.tischer.io) is then added.
If you leave it blank, it will be noreply if you add for example mail then it will be mail@www.tischer.io
NOW the last problem to solve is:
How can I make the email to:
sebastian@tischer.io
I want the website to run under www.tischer.io but the mail should be normal sebastian@tischer.io.
It doesn’t seem to take the from settings out of the config.production.json:
“from”: “‘Sebastian Tischer’ sebastian@tischer.io”,
Does anybody have an idea? :)