wp_mail(
            apply_filters( 'woocommerce_email_recipient_low_stock', get_option( 'woocommerce_stock_email_recipient' ), $product, null ),
            apply_filters( 'woocommerce_email_subject_low_stock', $subject, $product, null ),
            apply_filters( 'woocommerce_email_content_low_stock', $message, $product ),
            apply_filters( 'woocommerce_email_headers', '', 'low_stock', $product, null ),