docs: def post_to_url(self, value):
          """An Inbound Parse URL to send a copy of your email.
          If defined, a copy of your email and its spam report will be sent here.
  
          :param value: An Inbound Parse URL to send a copy of your email.
          If defined, a copy of your email and its spam report will be sent here.
          :type value: string
          """
          if isinstance(value, SpamUrl):
              self._post_to_url = value
          else:
              self._post_to_url = SpamUrl(value)