Why does this (not) work?

Hi,

I wrote two recipes.  The first one works, the second one does not.
Could anybody tell me why? 
(the perl-script test.pl produces some output to stdout, that I want to
sent back to the sender)

  :0 c
  * ^TO_testpl1@
  *!^FROM_DAEMON
  *!^X-Loop: testpl1(_at_)mydomain(_dot_)com
  |(formail -r -A "Precedence: junk" \
  -I"From: testpl1 <testpl1(_at_)mydomain(_dot_)com>" \
  -I"Subject: testpl1..." \
  -A "X-Loop: testpl1(_at_)mydomain(_dot_)com";\
  perl test.pl >$FILEDIR/testpl1.txt;\
  cat $FILEDIR/testpl1.txt )|$SENDMAIL -t

  :0 c
  * ^TO_testpl2@
  |(perl testpl2 )|$SENDMAIL -t

  # this doesnt work either :-(
  :0 c
  * ^TO_testpl2@
  | perl testpl2|$SENDMAIL -t

Thank you very much in advance!

   Costa