newsupernova/vendor/magento/module-sales/Controller/Adminhtml/Invoice/Email.php

<?php
/**
 *
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Sales\Controller\Adminhtml\Invoice;

class Email extends \Magento\Sales\Controller\Adminhtml\Invoice\AbstractInvoice\Email
{
}