`unrecv`

I have saved all the email I have received since 1987

Here's a typical message:

     Forwarded: Wed, 02 Mar 1994 10:58:13 EST
     Forwarded: mark
     Forwarded: mjd@cis.upenn.edu
     Replied: Thu, 02 Dec 1993 16:32:06 EST
     Replied: josephr@gradient.cis.upenn.edu (Joseph Rosenzweig )
     Replied: manager@linc
     Return-Path: josephr@gradient.cis.upenn.edu
     Received-Date: Thu, 2 Dec 93 16:28:52 EST
     Received: from linc.cis.upenn.edu (root@LINC.CIS.UPENN.EDU
            [130.91.6.8]) by central.cis.upenn.edu (8.6.4/UPenn 1.4)
            with ESMTP 
             id QAA06421 for <manager-linc@central.cis.upenn.edu>;
            Thu, 2 Dec 1993 16:28:51 -0500
     Received: from gradient.cis.upenn.edu (GRADIENT.CIS.UPENN.EDU
            [158.130.4.2]) by linc.cis.upenn.edu (8.6.4/UPenn 1.4)
            with SMTP
             id QAA22001 for <manager@linc.cis.upenn.edu>; Thu, 2 Dec
            1993 16:28:50 -0500
     Received: by gradient.cis.upenn.edu
             id AA09616; Thu, 2 Dec 93 16:28:50 EST
     From: josephr@gradient.cis.upenn.edu (Joseph Rosenzweig )
     Posted-Date: Thu, 2 Dec 93 16:28:49 EST
     Message-Id: <9312022128.AA09616@gradient.cis.upenn.edu>
     Subject: Broken elm program
     To: manager@linc.cis.upenn.edu
     Date: Thu, 2 Dec 93 16:28:49 EST
     X-Mailer: ELM [version 2.3 PL11-upenn1.7]

Most of this stuff is of potential interest

But probably not the Received: lines

In extreme cases, these are 20-40% of the entire file

I would like to delete them