welco/welco/sources/mail/templates/welco/mail_summary.html

{% load i18n %}
<p class="thumbnail">
 <a href="{{ site_base }}{{ object.content.url }}">
 <img src="{{ site_base }}{{ object.content.url }}.png" alt=""/>
 </a>
</p>

{% if object.associations.all|length > 1 %}
<strong>{% trans 'Mail with multiple formdata:' %}</strong>
<ul>
{% for association in object.associations.all %}
  <li><a href="{{association.formdata_url}}">{{association.formdef_name}}</a></li>
{% endfor %}
</ul>
{% endif %}