text question

[interactive]

ok i have a text file that looks like this

<<<<<<--------text file start-------->>>>>>
x-sender: <>
x-receiver: [e-mail]
From: [e-mail]
To: [e-mail]
Date: Thu, 13 May 1999 18:45:06 -0500
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
boundary="9B095B5ADSN=_01C1FA2CEF2932200000000Frobert"
Message-ID: <bpH71yEXU00000007@robert>
Subject: Delivery Status Notification (Failure)

This is a MIME-formatted message.

Portions of this message may be unreadable without a MIME-capable mail program.

--9B095B5ADSN=_01C1FA2CEF2932200000000Frobert
Content-Type: text/plain; charset=unicode-1-1-utf-7

This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.

   [e-mail]

--9B095B5ADSN=_01C1FA2CEF2932200000000Frobert
Content-Type: message/delivery-status

Reporting-MTA: dns;robert
Received-From-MTA: dns;robert
Arrival-Date: Thu, 13 May 1999 18:45:06 -0500

Final-Recipient: rfc822;[e-mail]
Action: failed
Status: 5.0.0

--9B095B5ADSN=_01C1FA2CEF2932200000000Frobert
Content-Type: message/rfc822

Received: from robert ([66.233.19.207]) by robert with Microsoft SMTPSVC(5.0.2195.2966);
Thu, 13 May 1999 18:45:06 -0500
Date: Thu, 13 May 1999 18:45:06 -0600
From: [e-mail]
Subject: This is the subject
To: [e-mail]
Return-Path: [e-mail]
Message-ID: <ROBERT7ITVAXaqwXQKM00000007@robert>
X-OriginalArrivalTime: 13 May 1999 23:45:06.0808 (UTC) FILETIME=[A134F780:01BE9D9A]

The body of the message

--9B095B5ADSN=_01C1FA2CEF2932200000000Frobert--

<<<<<<<<<<<-----end-------------->>>>>>>>

<-------------question-------------->
ok now how would i get the text past line (Content-Type: text/plain; charset=unicode-1-1-utf-7) and read it then end at the begining of (--9B095B5ADSN=_01C1FA2CEF2932200000000Frobert). also the char set will change from message to message so how would i also make room for that? all help is appreciated.