How to retrive forwarded message from multipart message body

[sanjay]

Getting trouble to retrive multipart (forwarded) message/attached file
from multipart message body. In multipart message, there is two
"content_type" in forwared messages, so that not able to find out
boundary using

Follwing is a part of multipart message
--------------837DBB1AC790B508BD6072B2
Content-Type: message/rfc822
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-ID: <92AAC9C8680006293816CD9AA8C8 at ksporz.eil.risnet.de>
From:
To :

Content-Type: multipart/mixed;
	boundary="----_=_NextPart_000_01C1EB9E.9F057660"

................. .............................
 ......it has some multipart message again.........
-----------------------------------------------

    m = mimetools.Message(multipartmsg).
    m.getparam("boundary")----shows None