replace THEMF with their full name, THEM with their address
REASON with "User dead" or whatever..  SUBJECT with their subject
and put their message at bottom...

telnet serv0 25
mail from: Mailer_Daemon
rcpt to: THEM
data
From: Mail Delivery Subsystem <Mailer-Daemon@cae.wisc.edu>
Subject: Returned mail: REASON
To: THEM

   ----- Transcript of session follows -----

While connected to serv0.cae.wisc.edu [144.92.4.11] (relay):
>>> RCPT To:<ljung@cae.wisc.edu>
<<< 550 <ljung@cae.wisc.edu>... REASON
550 ljung@cae.wisc.edu... REASON


   ----- Unsent message follows -----
Received: by serv0.cae.wisc.edu (16.8/client-1.3)
        id AA04173; Wed, 17 Mar 93 11:32:43 -0600
From: THEMF <THEM>
Message-Id: <9303171732.AA04173@serv0.cae.wisc.edu>
Subject: SUBJECT
To: ljung@cae.wisc.edu
Date: Wed, 17 Mar 93 11:32:42 CST
Full-Name: Dave Ljung
Mailer: Elm [revision: 70.30]


.
quit