bool TestExtNetwork::test_dns_get_mx() {
  Variant hosts;
  VERIFY(f_dns_get_mx("facebook.com", ref(hosts)));
  VERIFY(!hosts.toArray().empty());
  return Count(true);
}
bool f_getmxrr(CStrRef hostname, VRefParam mxhosts,
               VRefParam weight /* = uninit_null() */) {
    return f_dns_get_mx(hostname, ref(mxhosts), weight);
}