{
    # vim: ft=perl:
    $OUT = '';

    $props{Filter} ||= 'yes';

    return '# Filter property is no' 
	unless ($props{Filter} eq 'yes');

    my $preprocessing = "";
    my $dt = $qmail{DeliveryType} || '';

    if ($dt eq 'program')
    {
        $preprocessing .= '| ';
    }
    $preprocessing .= $qmail{DeliveryInstruction} || '';

    $OUT = "$preprocessing\n" if $preprocessing;
}
