title: Is the flag X-Unsent still working to Save and Open a .eml file as a draft?
body: <p>I'm capable of building an <code>.eml</code> file using <code>TIdMessage</code> in Delphi.</p>
  <p>It has a header like this:</p>
  <pre><code>X-Unsent: 1
  Subject: Testiing Subject
  To: &quot;testeing@mail.com&quot; &lt;testing@mail.com.br&gt;
  MIME-Version: 1.0
  Date: Tue, 6 Oct 2020 15:43:50 -0300
  Content-Type: text/html
  Content-Transfer-Encoding: quoted-printable
  Content-Disposition: inline
  </code></pre>
  <p>But when I open the file (with <code>ShellExecute()</code> via Delphi code, or the file itself) using Outlook and Thunderbird, both open it like a received e-mail and don't show options to send the message.</p>
  <p>From what I know, and found searching the Web, the <code>X-Unsent:1</code> header should do the trick.</p>
  <p>So my question is, does this flag not work anymore? If not, what should I try?</p>