DKIM and boilerplate conflict

Hello,
 
I have implemented the following subroutine dkim_sign (listed below) and call it from filter_end after I verify that specific criteria are met.  Prior to calling dkim_sign I utilize append_text_boilerplate and then call action_rebuild. 
 
My question is how do I pass the email with boilerplate to dkim_sign? 
 
This subroutine dkim_sign utilizes INPUTMSG but that is a copy of the entire message as received by Sendmail prior to any boilerplate or action* functions being called.  I see under the $CWD/Working dir the INPUTMBOX and msg-409-1.txt.
 
Any advice could be greatly appreciated.
 
 

sub dkim_sign
{
        my $dkim = Mail::DKIM::Signer->new(
                Algorithm => "rsa-sha1",
                Method => "relaxed",
                Domain => "roaringpenguin.com",
                Selector => "beta",
                KeyFile => "/etc/ssl/private/roaringpenguin.com.dkim.key");
        if (open(TOSIGN, "<INPUTMSG")) {
                while(<TOSIGN>) {
                        # remove local line terminators
                        chomp;
                        s/\015$//;
                        # use SMTP line terminators
                        $dkim->PRINT("$_\015\012");
                }
                close(TOSIGN);
                $dkim->CLOSE();
                my $signature = $dkim->signature()->as_string();
                $signature =~ s/^DKIM-Signature:\s+//i;
                action_add_header('DKIM-Signature', $signature);
        }
}
 
-Randy

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