cloudron-box/src/mail_templates/box_update_available.ejs

<%if (format === 'text') { %>

Dear <%= cloudronName %> Admin,

Cloudron v<%= newBoxVersion %> is now available!

Changes:
<% for (var i = 0; i < changelog.length; i++) { %>
  * <%- changelog[i] %>
<% } %>

Powered by https://cloudron.io

Sent at: <%= new Date().toUTCString() %>

<% } else { %>

<center>

<img src="<%= cloudronAvatarUrl %>" width="128px" height="128px"/>

<h3>Dear <%= cloudronName %> Admin,</h3>

<div style="width: 650px; text-align: left;">
    <p>
        Cloudron v<%= newBoxVersion %> is now available!
    </p>

    <h5>Changes:</h5>
    <ul>
    <% for (var i = 0; i < changelogHTML.length; i++) { %>
        <li><%- changelogHTML[i] %></li>
    <% } %>
    </ul>

    <br/>
</div>

<div style="font-size: 10px; color: #333333; background: #ffffff;">
    Powered by <a href="https://cloudron.io">Cloudron</a>.
</div>

</center>

<% } %>