diff --git a/welco/sources/mail/templates/welco/mail_home.html b/welco/sources/mail/templates/welco/mail_home.html
index d10d938..851de09 100644
--- a/welco/sources/mail/templates/welco/mail_home.html
+++ b/welco/sources/mail/templates/welco/mail_home.html
@@ -3,7 +3,7 @@
 <div data-source-type="{{ source_type.id }}">
 	<div id="source-sidebar" class="mails">
 		{% if display_filter %}
-		<select id="formdef-filter"></select>
+		<select id="category-filter"></select>
 		{% endif %}
 		<ul>
 			{% for mail in mails %}
@@ -16,6 +16,9 @@
 			    {% for association in mail.associations.all %}
 			    / <span data-formdef-reference="{{association.formdef_reference}}">{{association.formdef_name}}</span>
 			    {% endfor %}
+			    {% for category in mail.categories %}
+			      <span style="display: none" data-category-name="{{category}}"></span>
+			    {% endfor %}
 			</li>
 			{% endfor %}
 		</ul>
diff --git a/welco/static/css/style.css b/welco/static/css/style.css
index be35234..8e77610 100644
--- a/welco/static/css/style.css
+++ b/welco/static/css/style.css
@@ -95,7 +95,7 @@ div#content .cell.document iframe {
 }
 
 div#content #source-sidebar {
-	min-width: 20em;
+	width: 25em;
 	display: none; /* only displayed when on top */
 }
 
@@ -440,7 +440,7 @@ form#note textarea {
 	height: 8em;
 }
 
-#formdef-filter {
+#category-filter {
 	width: 100%;
 }
 
diff --git a/welco/static/js/welco.js b/welco/static/js/welco.js
index 1d740ef..be7aff8 100644
--- a/welco/static/js/welco.js
+++ b/welco/static/js/welco.js
@@ -364,37 +364,37 @@ $(function() {
   $('#postit').on('click', window.displayPopup);
   $('#id_post_date').datepicker($.datepicker.regional["fr"]);
 
-  if ($('#formdef-filter').length) {
-     var known_formdefs = Object();
-     $('[data-formdef-reference]').each(function(index, elem) {
-         known_formdefs[$(elem).data('formdef-reference')] = $(elem).text();
+  if ($('#category-filter').length) {
+     var known_categories = Object();
+     $('[data-category-name]').each(function(index, elem) {
+         known_categories[$(elem).data('category-name')] = $(elem).data('category-name');
      });
      var options = Array();
-     $(Object.keys(known_formdefs)).each(function(index, elem) {
-         options.push({'key': elem, 'value': known_formdefs[elem]});
+     $(Object.keys(known_categories)).each(function(index, elem) {
+         options.push({'key': elem, 'value': known_categories[elem]});
      });
      options.sort(function(x, y) {
          if (x.value > y.value) return 1;
          if (x.value < y.value) return -1;
          return 0;
      });
-     $('#formdef-filter').empty();
+     $('#category-filter').empty();
      /* TODO: should use javascript i18n */
-     $('<option value="">Tout</option>').appendTo($('#formdef-filter'));
+     $('<option value="">Toutes</option>').appendTo($('#category-filter'));
      $(options).each(function(index, elem) {
-         $('<option value="' + elem.key + '">' + elem.value + '</option>').appendTo($('#formdef-filter'));
+         $('<option value="' + elem.key + '">' + elem.value + '</option>').appendTo($('#category-filter'));
      });
-     $('#formdef-filter').on('change', function() {
-         var selected_formdef = $(this).val();
-         if (selected_formdef == '') {
+     $('#category-filter').on('change', function() {
+         var selected_category = $(this).val();
+         if (selected_category == '') {
              $('#source-sidebar li').removeClass('li-visible');
              $('#source-sidebar li').show();
          } else {
              $('#source-sidebar li').each(function(index, elem) {
-                 var formdef_references = $(elem).find('[data-formdef-reference]').map(function(idx, elem) {
-                     return $(elem).data('formdef-reference');
+                 var category_references = $(elem).find('[data-category-name]').map(function(idx, elem) {
+                     return $(elem).data('category-name');
                  }).toArray();
-                 if (formdef_references.indexOf(selected_formdef) == -1) {
+                 if (category_references.indexOf(selected_category) == -1) {
                      $(elem).removeClass('li-visible');
                      $(elem).hide();
                  } else {