{
    return "" if (defined $EmailUnknownUser && $EmailUnknownUser ne 'returntosender');

    $OUT = "";

    $OUT .= "p*:admin:\n";
    $OUT .= "p*:admin\@*:\n";
    $OUT .= "p*:admin-*:\n";

    $OUT .= "p*:root:\n";
    $OUT .= "p*:root\@*:\n";
    $OUT .= "p*:root-*:\n";
}
