diff --git a/doc/getting_started/plugins.rst b/doc/getting_started/plugins.rst
index 1bc6c2def..2b47858e7 100644
--- a/doc/getting_started/plugins.rst
+++ b/doc/getting_started/plugins.rst
@@ -36,16 +36,27 @@ the *Modoboa > Parameters > Limits* page.
 Postfix relay domains support
 *****************************
 
-This plugin adds the support for relay domains using postfix. This
-feature is useful when the MTA managed by Modoboa is not the final
-destination of one or many domains.
+This plugin adds the support for relay domains using postfix. You can
+use it when the MTA managed by Modoboa is not the final destination of
+one or several domains.
 
-If activated, two new objects will be available from the *domains*
+If activated, two new objects will be available from the *Domains*
 listing page: *relay domain* and *relay domain alias*.
 
-This extension is compatible with the *amavis* and *limits*
+The extension is compatible with the *amavis* and *limits*
 ones. Resellers will be able to create both new objects.
 
+To tell Postfix this feature exists, you must generate two new map
+files and then update your configuration.
+
+To generate the map files, run the following command::
+
+  $ modoboa-admin.py postfix_maps --categories relaydomains --dbtype <the database you use> <path>
+
+Replace values between ``<>`` by yours.
+
+Edit the :file:`/etc/postfix/main.cf` file.
+
 .. _amavis_frontend:
 
 ********************
diff --git a/modoboa/extensions/amavis/templates/amavis/main_action_bar.html b/modoboa/extensions/amavis/templates/amavis/main_action_bar.html
index 54cbe6ab8..709460220 100644
--- a/modoboa/extensions/amavis/templates/amavis/main_action_bar.html
+++ b/modoboa/extensions/amavis/templates/amavis/main_action_bar.html
@@ -14,12 +14,12 @@
     </ul>
   </div>
   <div class="btn-group">
-    <a name="release-multi" href="{% url 'modoboa.extensions.amavis.views.process' %}" class="btn btn-success">
+    <a name="release-multi" href="{% url 'modoboa.extensions.amavis.views.process' %}" class="btn btn-success disabled">
       <i class="icon-white icon-ok"></i> {% trans "Release" %}
     </a>
   </div>
   <div class="btn-group">
-    <a name="delete-multi" href="{% url 'modoboa.extensions.amavis.views.process' %}" class="btn btn-danger">
+    <a name="delete-multi" href="{% url 'modoboa.extensions.amavis.views.process' %}" class="btn btn-danger disabled">
       <i class="icon-white icon-trash"></i> {% trans "Delete" %}
     </a>
   </div>
diff --git a/modoboa/extensions/stats/templates/stats/index.html b/modoboa/extensions/stats/templates/stats/index.html
index b70947d06..9aec1d1ef 100644
--- a/modoboa/extensions/stats/templates/stats/index.html
+++ b/modoboa/extensions/stats/templates/stats/index.html
@@ -47,10 +47,12 @@ $(document).ready(function() {
       <form class="form-inline">
         <span id="custom-period">
           <div class="input-prepend">
-            <span class="add-on"><i class="icon-indent-left"></i></span><input id="id_from" class="span10" name="date_from" value="{{ start }}" type="text" />
+            <span class="add-on"><i class="icon-indent-left"></i></span>
+            <input id="id_from" class="span10" name="date_from" value="{{ start }}" type="text" readonly="readonly" />
           </div>
           <div class="input-prepend">
-            <span class="add-on"><i class="icon-indent-right"></i></span><input id="id_to" class="span10" name="date_to" value="{{ end }}" type="text" />
+            <span class="add-on"><i class="icon-indent-right"></i></span>
+            <input id="id_to" class="span10" name="date_to" value="{{ end }}" type="text" readonly="readonly" />
           </div>
           <button class="btn" id="customsend">{% trans "Apply" %}</button>
         </span>