cat: command not found

I have my suppose to be one time autoresponder on:

:0 Whc: vacation.lock
* !^FROM_DAEMON
* !^X-Loop: poohba(_at_)poohba(_dot_)adsl(_dot_)duke(_dot_)edu
| formail -rD 8192 vacation.cache

 :0 ehc    # if the name was not in the cache
 | (formail -rA"Precedence: junk" \
      -A"X-Loop: poohba(_at_)poohba(_dot_)adsl(_dot_)duke(_dot_)edu" ; \
    echo "I received your mail,"; \
    echo "-- "; cat $HOME/.signature \
   ) | $SENDMAIL -oi -t

And I get this at the end of the killfile:

procmail: Notified comsat: "poohba(_at_)597710:/var/spool/mail/poohba"
/bin/bash: cat: command not found


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