cannot bounce mail successfully

I am using Cyrus IMAP, Postfix and procmail as LDA. If a mailbox is overquota
I want to bounce the mail with a descriptive Subject line. This works
but there is always a copy of the email left in the MTA queue although
the procmail recipe has been executed successful.

That are the main lines in my rc file:

##############################################################################

    # this recipes delivers the email to the mailbox
    :0 w
    | $DELIVERMAIL $LOGNAME
    
    # if delivery fails this recipe checks if the error is EX_TEMPFAIL
    # which frequently means that the mailbox is overquota
    :0 e
    {
       EXITCODE=$?
       REC=`formail -x"To: "`
    
       :0 w
       * EXITCODE ?? 75
       * ! X-Loop: bounce(_at_)pure(_dot_)ch
       | formail -rk -I"Subject: Problem for $REC. Probably Mailbox full." \
         -A"Precedence: junk" -A"X-Loop: bounce(_at_)pure(_dot_)ch" | $SENDMAIL
    
    }
    
    EXITCODE=69
    
    HOST
##############################################################################

Any hints?

 Werner
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