Content-Type: multipart/related; start=<AAA>; boundary=my_boundary
X-Some-Header: Some-Value
MIME-Version: 1.0


--my_boundary
Content-Type: text/plain

this is the text in this entity

--my_boundary
Content-Type: multipart/mixed; boundary=mms_boundary
MIME-Version: 1.0


--mms_boundary
Content-Type: text/plain

this is the mms message text

--mms_boundary
Content-Type: application/xml

<?xml version="1.0"?>
<!DOCTYPE pap PUBLIC "-//WAPFORUM//DTD PAP 2.0//EN"
  "http://www.wapforum.org/DTD/pap_2.0.dtd">
<pap>
  <push-message push-id="4879683648">
    <address address-value="user1@domain.com"/>
    <address address-value="user2@domain.com"/>
    <address address-value="user3@domain.com"/>
  </push-message>
</pap>

--mms_boundary--

--my_boundary--