code: def get_backend_class():
      
      # this will (intentionally) blow up if the setting does not exist
      assert hasattr(settings, 'INBOUND_EMAIL_PARSER')
      assert getattr(settings, 'INBOUND_EMAIL_PARSER') is not None
  
      package, klass = settings.INBOUND_EMAIL_PARSER.rsplit('.', 1)
      module = import_module(package)
      return getattr(module, klass)
docs: Return reference to the configured backed class.