title: What is exactly hostname for sending Microsoft Exchange email with mailcore
body: <p>I can not send MS Exchange email with mailcore.
  It always returns an error "A stable connection to the server could not be established".
  Here is my code</p>
  
  <pre><code>    smtpSession.hostname = @"smtp.outlook.office365.co.uk";
      smtpSession.username = [currentUser objectForKey:@"email_account"];
      smtpSession.password = [currentUser objectForKey:@"email_password"];
      smtpSession.port = 25;
      smtpSession.connectionType = MCOConnectionTypeClear;
  </code></pre>
  
  <p>I think it because of the hostname.
  Could anybody tell me what is exactly hostname of MS Exchange in this case?</p>