formail not working !!

Hi, i've wrote the following recipe in order to
prevent delivery of mails when they exceed MAXSIZE,
but formail is not returning a failure delivery
message for the sender.

Here's the recipe (written for testing purposes):

MAXSIZE=10000
BOXSIZE=9999

:0
* $ $MAXSIZE^0
* $ -$BOXSIZE^0
{
    :0
    * > $=
        {
        :0 h
        * ! ^Subject.*mail delivery failure
        | (formail -r -I "From: manager(_at_)elbarid(_dot_)net" \
                        -I "Subject: mail delivery
failure"; \
                        echo "Mailbox full") |
$SENDMAIL -t

        :0 E
        /dev/null
        }
}

:0 Eh
* ! ^Subject.*mail delivery failure
| (formail -r -I "From: manager(_at_)elbarid(_dot_)net" \
                        -I "Subject: mail delivery
failure"; \
                        echo "Mailbox full") |
$SENDMAIL -t

:0 E
/dev/null


/****************************************************/
/****************************************************/
Here's my procmailrc:

SHELL=/bin/sh
SENDMAIL=/usr/lib/sendmail
PMDIR=/etc/Procmail
LOGFILE=$PMDIR/log
verbose=yes
MAILDIR=$HOME
INCLUDERC=$PMDIR/rc.mail_limitation
/**********************************************/
/**********************************************/

and here's the log of a test message:

> From momo(_at_)elbarid(_dot_)net  Thu Dec 26 20:06:29 2002
 Subject: hello
  Folder:  (formail -r -I "From: manager(_at_)elbarid(_dot_)net"
\                     775
> From root  Thu Dec 26 20:06:29 2002
 Subject: mail delivery failure
  Folder: /dev/null          


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