docs: def getAdministrator(self, email, returned_properties=None):
          """Get the :class:`rtcclient.models.Administrator` object
          by the email address
  
          :param email: the email address (e.g. somebody@gmail.com)
          :param returned_properties: the returned properties that you want.
              Refer to :class:`rtcclient.client.RTCClient` for more explanations
          :return: the :class:`rtcclient.models.Administrator` object
          :rtype: rtcclient.models.Administrator
          """
  
          if not isinstance(email, six.string_types) or "@" not in email:
              excp_msg = "Please specify a valid email address name"
              self.log.error(excp_msg)
              raise exception.BadValue(excp_msg)
  
          self.log.debug("Try to get Administrator whose email is %s",
                         email)
          rp = returned_properties
          administrators = self._getAdministrators(returned_properties=rp,
                                                   email=email)
          if administrators is not None:
              administrator = administrators[0]
              self.log.info("Get <Administrator %s> in <ProjectArea %s>",
                            administrator, self)
              return administrator
  
          msg = "No administrator's email is %s in <ProjectArea %s>" % (email,
                                                                        self)
          self.log.error(msg)
          raise exception.NotFound(msg)