Content-Type: multipart/alternative; boundary="===============5006593052976639648=="
MIME-Version: 1.0
Subject: My subject
From: foo@example.org
To: bar@example.net

--===============5006593052976639648==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

This is HTML
--===============5006593052976639648==
Content-Type: text/html; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

<html>
          <body>
          This is <i>HTML</i>
          </body>
          </html>

--===============5006593052976639648==--

