<message>
<header>
<field>
Content-Type: multipart/mixed; boundary="boundary"</field>
</header>
<multipart>
<preamble>
preamble
</preamble>
<body-part>
<header>
<field>
Content-Type: text/plain</field>
</header>
<body>
first part
</body>
</body-part>
<body-part>
<header>
<field>
Content-Type: text/plain</field>
</header>
<body>
from the rfc:
================================
encapsulation := delimiter transport-padding
                      CRLF body-part
================================
and also
================================
"Composers MUST NOT generate non-zero length transport
padding, but receivers MUST be able to handle padding
added by message transports."
================================

second part have a start boundary ending with spaces
and also have a boundary not at the beginning
 --boundary
... that should be ignored

also a boundary with more data (a tab) shoud be ignored
 --boundary	
 
end of part
</body>
</body-part>
<epilogue>
epilouge</epilogue>
</multipart>
</message>