Getting rid of Info in the Message Page

I believe this is part of what is called Converted Message Header.  How
can I get rid of it or change it?
 
*       To: < > 
*       Subject: [Test] bart 
*       From: "bart" > 
*       Date: Wed, 24 Apr 2002 11:28:12 -0400 
*       Importance: Normal 
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*       List-subscribe: < >,< > 
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*       Sender