courier.settings.yml in Courier 2.x

config/install/courier.settings.yml

3 string references to 'courier.settings'

Settings::buildForm in src/Form/Settings.php

Form constructor.

Settings::getEditableConfigNames in src/Form/Settings.php

Gets the configuration names that will be editable.

Settings::submitForm in src/Form/Settings.php

Form submission handler.

File

config/install/courier.settings.yml

skip_queue: false
channel_preferences:
  user:
    - courier_email