message: Timeout for outer network.
diff: @@ -12,7 +12,7 @@ go(function () {
  'open_eof_check' => true,
  'package_eof' => "\r\n",
  ]);
  - $client->connect('smtp.qq.com', 25);
  + $client->connect('smtp.qq.com', 25, 5);
  go(function () use ($client) {
  $n = 9;
  while ($n--) {
  