title: SmtpClient is working with wrong credentials
body: <p>My Smtpclient is working with following setup</p>
  
  <pre><code>SmtpClient client = new SmtpClient();
  client.Host = server;
  client.UseDefaultCredentials = false;
  client.Credentials = new NetworkCredential("username", "totallywrongpassword", "DOMAIN");
  
  try
  {
      client.Send(message);
  }
   catch
   {
     // no exception is thrown, emails are send
   }
  </code></pre>
  
  <p>I am providing invalid credentials, yet the emails are being sent. </p>
  
  <p>What am I configuring wrong?</p>
  
  <p>The smtp server and client are on the same local domain.</p>