magento-test/app/code/Magento/Customer/view/frontend/email/change_email.html

<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<!--@subject {{trans "Your %store_name email has been changed" store_name=$store.frontend_name}} @-->
<!--@vars {
"var store.frontend_name":"Store Name",
"var store_email":"Store Email",
"var store_phone":"Store Phone",
"var customer.name":"Customer Name"
} @-->
{{template config_path="design/email/header_template"}}

<p class="greeting">{{trans "%name," name=$customer.name}}</p>
<p>
    {{trans "We have received a request to change the following information associated with your account at %store_name: email." store_name=$store.frontend_name}}
    {{trans 'If you have not authorized this action, please contact us immediately at <a href="mailto:%store_email">%store_email</a>' store_email=$store_email |raw}}{{depend store_phone}} {{trans 'or call us at <a href="tel:%store_phone">%store_phone</a>' store_phone=$store_phone |raw}}{{/depend}}.
</p>

{{template config_path="design/email/footer_template"}}