Code-Snippets-Functions/Execute a function on a child site/WooCommerce/disable-customer-order-email-for-free-orders.txt

add_filter('woocommerce_email_recipient_new_order', 'restrict_admin_new_order_mail', 1, 2);
function restrict_admin_new_order_mail( $recipient, $order ) {
    if ( ! is_a( $order, 'WC_Order' ) ) 
        return $recipient;

    if( $order->get_total() > 0 ) {
        return $recipient;
    } else {
        return '';
    }
}