code: def do_email_authors(self, comment, entry, site):
          
          if not self.email_authors:
              return
  
          exclude_list = self.mail_comment_notification_recipients + ['']
          recipient_list = (
              set([author.email for author in entry.authors.all()])
              - set(exclude_list)
          )
          if not recipient_list:
              return
  
          template = loader.get_template(
              'comments/zinnia/entry/email/authors.txt')
          context = {
              'comment': comment,
              'entry': entry,
              'site': site,
              'protocol': PROTOCOL
          }
          subject = _('[%(site)s] New comment posted on "%(title)s"') % \
              {'site': site.name, 'title': entry.title}
          message = template.render(context)
  
          send_mail(
              subject, message,
              settings.DEFAULT_FROM_EMAIL,
              recipient_list,
              fail_silently=not settings.DEBUG
          )
docs: Send email notification of a new comment to
          the authors of the entry.