My suggestion: don't change LISTSERV, but educate the user.
It will pay dividends in less consumption of bandwidth, disc
storage (viz. archives), and people time (reading).
 
Here is my standard boilerplate when such bounces to
the owner:
 
Dear
 
If you want this distributed to all of xxxxxx-L, you will need to
remove the original "headers" that you included in your reply: the
software does not allow you to include them, thinking that it is
a "loop."
 
Additionally, please remove all other original signatures and text
NOT essential for context.
 
Thanks.
 
--  co-owner INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L
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31 Shields Bldg. -- Penn State Univ -- University Park, PA 16802-1202 USA