title: smtp.live.com - mailbox unavailable. The server response was: 5.7.3 requested action aborted; user not authenticated
body: <p>I have read other answers on the stackoverflow. but none of the solutions work for me.</p>
  
  <p>I'm trying to send email through live.com, but unable to it.</p>
  
  <p>The error message:</p>
  
  <pre><code>mailbox unavailable. The server response was: 5.7.3 requested action aborted;
  user not authenticated
  </code></pre>
  
  <p>The code:</p>
  
  <pre><code>MailMessage mail = new MailMessage();
  mail.From = new MailAddress("email@live.com");
  mail.To.Add("someone@someone.com");
  mail.Subject = "hello";
  mail.Body = "awefkljj kawefl";
  mail.IsBodyHtml = false;
  
  SmtpClient smtp = new SmtpClient("smtp.live.com", 587);
  smtp.EnableSsl = true;
  smtp.Credentials = new NetworkCredential("email@live.com", "password");
  smtp.Send(mail);
  </code></pre>
  
  <p>Are you able to send the email by using above code?</p>
  
  <p>It works before, last year, but it is no more working now.</p>
  
  <p>What had been changed?</p>