My "moronic" autoresponder is broken...

I have an autoresponder that detects forwarded messages from _known_ offenders 
who continue to forward joke lists and other annoying things to me (these 
people 
also send me legitimate mail, so I don't want to filter them altogether).  

Today, for some reason, there's a problem.  Messages are properly detected and 
an autoreply is sent, but the body is empty (neither the reply.txt file nor the 
original message body shows up in the reply).  Another similar autoresponder, 
using the same formail flags, etc., works fine. Does anyone see a problem with 
the recipe that may cause this?  Here it is (the names have been changed to 
protect the innocent :-):

    :0
    * !^FROM_MAILER
    * !^X-Mailer: dale(_at_)elad(_dot_)com
    * ^From.*(offender1|offender2|offender3|offender4|offender5)
    * ^TO_me(_at_)mydomain(_dot_)com
    * ^Subject:[        ]*(FW|FWD):
    {
       :0 fhw
       | cat - /home/myaccount/.procmail/reply.txt

       :0
       | (formail -krfqp "" -A "Precedence: junk" -I "X-Mailer: 
dale(_at_)elad(_dot_)com" \
       -I "From: Dale W. Neumann <dale(_at_)elad(_dot_)com>" \
       -i "Subject: A message about unwanted mail...") \
       | sendmail -t
    }

Server is running Procmail v3.13.1 on Red Hat Linux release 4.0, Kernel 2.1.8. 

   Thanks,
   Dale