mailtrain/server/views/subscription/partials/subscription-manage-address-form.hbs

<form id="main-form" method="post" action="/subscription/{{lcid}}/manage-address">

    <input type="hidden" name="_csrf" value="{{csrfToken}}">
    <input type="hidden" name="cid" value="{{cid}}">

    <div class="form-group email">
        <label for="EMAIL">{{#translate}}existingEmailAddress{{/translate}}</label>
        <input type="email" name="EMAIL" id="email" placeholder="" value="{{email}}" readonly>
    </div>

    <div class="form-group email">
        <label for="EMAIL_NEW">{{#translate}}newEmailAddress{{/translate}}</label>
        <input type="email" name="EMAIL_NEW" id="email-new" placeholder="Your new email address" value="{{email}}">
    </div>

    <p>
        {{#translate}}youWillReceiveAConfirmationRequestToYour{{/translate}}
    </p>

    <button type="submit" style="position: absolute; top: -9999px; left: -9999px;">{{#translate}}updateEmailAddress{{/translate}}</button>

</form>