autoresponder for MS express, netscape, ecc

folks,
I have a simple question:
how to correctly autorespond to a message coming from outlook express?

I've tried some recipes taken from Procmail Mini-Tutorial in linux gazette
issue #14 but if someone write using ms mailer gets an ugly response from
the autoresponder; (you see all the MIME headers)

the autoresponder should quote the received message, then cat some file in
the home or trash the body when the received message it's not in text
format;

Someone help me out!
thanks

tomaso