code: def process_bounce(message, notification):
      
      mail = message['mail']
      bounce = message['bounce']
  
      bounces = []
      for recipient in bounce['bouncedRecipients']:
          # Create each bounce record. Add to a list for reference later.
          bounces += [Bounce.objects.create(
              sns_topic=notification['TopicArn'],
              sns_messageid=notification['MessageId'],
              mail_timestamp=clean_time(mail['timestamp']),
              mail_id=mail['messageId'],
              mail_from=mail['source'],
              address=recipient['emailAddress'],
              feedback_id=bounce['feedbackId'],
              feedback_timestamp=clean_time(bounce['timestamp']),
              hard=bool(bounce['bounceType'] == 'Permanent'),
              bounce_type=bounce['bounceType'],
              bounce_subtype=bounce['bounceSubType'],
              reporting_mta=bounce.get('reportingMTA'),
              action=recipient.get('action'),
              status=recipient.get('status'),
              diagnostic_code=recipient.get('diagnosticCode')
          )]
  
      # Send signals for each bounce.
      for bounce in bounces:
          signals.feedback.send(
              sender=Bounce,
              instance=bounce,
              message=message,
              notification=notification
          )
  
      logger.info('Logged %s Bounce(s)', str(len(bounces)))
  
      return HttpResponse('Bounce Processed')
docs: Function to process a bounce notification