how do I hide message formatting information in received emails?

I occasionally receive email messages where the content does not seem to be
decoded properly and I am left with all the junk listed below plus a whole
lot more depending on the size of the original email. In looking through the
info is appears that the info is the MIME encoding information however I am
no expert.

Can anyone explain to me why only some messages I receive look like the
below and the rest are fine?

Thanks in advance.

Return-Path: <prvs=randy.horien=(E-Mail Removed)>
Received: from priv-edmwaa11.telusplanet.net ([216.7.198.7])
by priv-edmwes33.telusplanet.net
(InterMail vM.7.08.02.00 201-2186-121-20061213) with ESMTP
id
<20080422231113.NCHT4256.priv-(E-Mail Removed)>
for <(E-Mail Removed)>; Tue, 22 Apr 2008 17:11:13 -0600
Received: from mx1a.trigger.net (mx1a.trigger.net [216.7.198.7])
by priv-edmwaa11.telusplanet.net (BorderWare MXtreme Infinity Mail
Firewall) with ESMTP id 84XSUESP53
for <(E-Mail Removed)>; Tue, 22 Apr 2008 17:11:09 -0600 (MDT)
Received: by mx1a.trigger.net (Postfix)
id 3D7768482; Tue, 22 Apr 2008 19:11:09 -0400 (EDT)