title: send X-headers from outlook.live.com smtp
body: <p>I am trying to send some emails, through hotmail (outlook.live) smtp server. I am building an app that is somewhat an email client and I need to send some custom headers to provide some functionality.</p>
  
  <p>The thing is that, while other email servers (only tried with Gmail and aol) accept custom headers or other rfc described headers (custom like, X-test and rfc described "Comments" or "Keywords") hotmail does not, the email sent does not contain those headers while the ones received from Gmail or aol contain the custom header.</p>
  
  <p>Does hotmail require something extra or in a different format? Or they just remove them? </p>