cloudron-box/src/mail_templates/box_update_available.ejs

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

Dear Admin,

Version <%= newBoxVersion %> of Cloudron <%= fqdn %> is now available!

Your Cloudron will update automatically tonight. Alternately, update immediately at <%= webadminUrl %>.

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

Thank you,
your Cloudron

<% } else { %>

<center>

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

<h3>Dear Admin,</h3>

<p>
    Version <%= newBoxVersion %> of Cloudron <%= fqdn %> is now available!
</p>

<p>
    Your Cloudron will update automatically tonight. Alternately, update immediately at <%= webadminUrl %>.
</p>

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

<br/>
<br/>

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

</center>

<% } %>