def ex_update_mail_redirect(self, mail_r, destination, source=None):
        zone_id = mail_r.zone.id
        r_json = {'destination_address': destination}
        if source is not None:
            r_json['source_address'] = source
        r_data = json.dumps({'zone_redirect': r_json})
        try:
            response = self.connection.request('/zones/%s/mail_redirects/%s' %
                                               (zone_id, mail_r.id),
                                               method='PUT', data=r_data)
        except (BaseHTTPError, MalformedResponseError):
            e = sys.exc_info()[1]
            if isinstance(e, MalformedResponseError) and e.body == 'Not found':
                raise PointDNSException(value='Couldn\'t found mail redirect',
                                        http_code=httplib.NOT_FOUND,
                                        driver=self)
            raise PointDNSException(value=e.message, http_code=e.code,
                                    driver=self)
        mail_redirect = self._to_mail_redirect(response.object,
                                               zone=mail_r.zone)
        return mail_redirect
Deletes the MSU user summary entity from Datastore.
dataset/ETHPy150Open apache/libcloud/libcloud/dns/drivers/pointdns.py/PointDNSDriver.ex_update_mail_redirect--crossover with--dataset/ETHPy150Open google/simian/src/simian/mac/models/base.py/ReportsCache.DeleteMsuUserSummary