View file themes/default/templates/system/mail/templates/changed_email_notification.phtml

<?php

/**
 * @var $user_name
 * @var $user_login
 * @var $link_to_confirm
 * @var $config
 */

$this->layout('system::mail/layouts/default', ['email_title' => __('Changing email address')]);
?>

<?= __('Hello, %s!', $user_name) ?>
<p>
    <?= __('You have started the process of changing the email address on the <a href="%s">%s</a> website', $config['homeurl'], $config['copyright']) ?>
</p>
<p>
    <?= __('The new email address is:') ?> <b><?= $new_email ?></b>
</p>
<p>
    <?= __('If you have not started the procedure for changing email, please contact us in any way convenient for you.') ?>
</p>