[Mailman-Users] Stripping Header from post?

[Devin]

Myself and the other administrator that I've set up for this list have
decided to make it members only, and have those members posts be
anonymous. While I've found in the settings where to make the mail look
like it's just coming from the list admin rather then "on behalf of..."
the header still lists who the mail was from. Here's an example:

It appears when you look at the header it still shows "(envelope-from
name at domain.com), Is there a way so it doesn't show the envelope-from
in the header?)

Any response would greatly be appreciated. We are currently using
Mailman 2.0.13.

An example of the header shows:
 
Return-Path: <theloosescrew-list-admin at aros.net>
Received: from phobos.aros.net (localhost [127.0.0.1])
 by localhost (8.12.9/8.12.8) with ESMTP id h61JJ36s020812
 for <dangermouse at aros.net>; Tue, 1 Jul 2003 13:19:03 -0600 (MDT)
 (envelope-from theloosescrew-list-admin at aros.net)
Received: from mail1.microsoft.com (mail1.microsoft.com [131.107.3.125])
 by phobos.aros.net (8.12.9/8.12.8) with ESMTP id h61JIo6s020640
 for <theloosescrew-list at aros.net>; Tue, 1 Jul 2003 13:18:50 -0600 (MDT)
 (envelope-from swynn at microsoft.com)
Received: from inet-vrs-01.redmond.corp.microsoft.com ([157.54.8.27]) by
mail1.microsoft.com with Microsoft SMTPSVC(5.0.2195.6659);
  Tue, 1 Jul 2003 12:18:49 -0700
Received: from 157.54.5.25 by inet-vrs-01.redmond.corp.microsoft.com
(InterScan E-Mail VirusWall NT); Tue, 01 Jul 2003 12:18:49 -0700
Received: from SVC-MSG-02.northamerica.corp.microsoft.com
([157.57.215.129]) by inet-hub-03.redmond.corp.microsoft.com with
Microsoft SMTPSVC(6.0.3790.0);
  Tue, 1 Jul 2003 12:18:49 -0700
X-MimeOLE: Produced By Microsoft Exchange V6.5.6944.0
Content-class: urn:content-classes:message
MIME-Version: 1.0
Content-Type: multipart/mixed;
 boundary="------------InterScan_NT_MIME_Boundary"