title: Send qq mail in Dart
body: <p>I am using <a href="https://pub.dartlang.org/packages/mailer" rel="nofollow noreferrer">mailer</a> package to send mail whose host is <code>QQ</code> which is very popular in China.</p>
  
  <pre><code>String username = 'xx@qq.com';
  String password = 'xx';
  
  final smtpServer = new SmtpServer("smtp.qq.com", port: 465, username: username, password: password);
  
  // Create our message.
  final message = new Message()
    ..from = new Address(username, 'Your name')
    ..recipients.add('receiver@qq.com')
    ..subject = 'Test Dart Mailer library ::  :: ${new DateTime.now()}'
    ..text = 'This is the plain text.\nThis is line 2 of the text part.'
    ..html = "&lt;h1&gt;Test&lt;/h1&gt;\n&lt;p&gt;Hey! Here's some HTML content&lt;/p&gt;";
  
  final sendReports = await send(message, smtpServer);
  </code></pre>
  
  <p>However it fails. Is there anything I left?</p>