{ 
    $OUT = '';
    return unless $GatewayIP;
    # we allow access from the router, but we do not allow relaying
    $OUT .= "$GatewayIP:allow";
    $OUT .= ',MAILRULES="/var/qmail/control/mailrules.default"';
    $OUT .= ',QMAILQUEUE="' . $externalfilter . '"';
}
