modoboa/modoboa/templates/common/viewmail.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <link rel="stylesheet" type="text/css" href="{{ STATIC_URL }}css/viewmail.css" />
  </head>
  <body>
    <div id="table-container">
      {{ headers }}
    </div>
    {{ mailbody|safe }}
  </body>
</html>