I want to edit the settings for mail and externalAuthentication.
Found the description how to set them,
but cannot find the information where to set them.
Is there a file or a database table and how do change them?
You can modify the settings under Administration/Application Properties/cuba/email
Take a look at this manual page: https://doc.cuba-platform.com/manual-6.6/app_properties.html
And thx to Hubertus,
also found that mail stuff.