<message>
<header>
<field>
Content-Type: multipart/mixed; boundary="------------299A70B339B65A93542D2AE"</field>
</header>
<multipart>
<preamble>
This is a multi-part message in MIME format.
</preamble>
<body-part>
<header>
<field>
Content-Type: text/plain; charset=us-ascii</field>
<field>
Content-Transfer-Encoding: 7bit</field>
</header>
<body>
Text body
</body>
</body-part>
<epilogue>
That was a multi-part message in MIME format.
</epilogue>
</multipart>
</message>