code: def get_recipients(self, **options):
          
          if options['recipients_from_setting']:
              return settings.TIMELINE_DIGEST_EMAIL_RECIPIENTS
  
          users = get_user_model()._default_manager.all()
          if options['staff']:
              users = users.filter(is_staff=True)
          elif not options['all']:
              users = users.filter(is_staff=True, is_superuser=True)
          return users.values_list(settings.TIMELINE_USER_EMAIL_FIELD, flat=True)
docs: Figures out the recipients