diff --git a/modoboa/core/app_settings.py b/modoboa/core/app_settings.py
index ec5644e47..f05e4028c 100644
--- a/modoboa/core/app_settings.py
+++ b/modoboa/core/app_settings.py
@@ -25,6 +25,8 @@ def enabled_applications():
         exts = Extension.objects.filter(enabled=True)
         for ext in exts:
             extclass = exts_pool.get_extension(ext.name)
+            if extclass is None:
+                continue
             if extclass.available_for_topredirection:
                 result.append((ext.name, ext.name))
     return sorted(result, key=lambda e: e[0])
diff --git a/modoboa/core/templatetags/core_tags.py b/modoboa/core/templatetags/core_tags.py
index 4113e8b48..9cbed9c08 100644
--- a/modoboa/core/templatetags/core_tags.py
+++ b/modoboa/core/templatetags/core_tags.py
@@ -43,20 +43,20 @@ def extensions_menu(selection, user):
 def admin_menu(selection, user):
     entries = [
         {"name": "extensions",
-         "class": "ajaxlink",
+         "class": "ajaxnav",
          "url": "extensions/",
          "label": _("Extensions"),
          "img": ""},
         {"name": "info",
-         "class": "ajaxlink",
+         "class": "ajaxnav",
          "url": "info/",
          "label": _("Information")},
         {"name": "logs",
-         "class": "ajaxlink",
+         "class": "ajaxnav",
          "url": "logs/?sort_order=-date_created",
          "label": _("Logs")},
         {"name": "parameters",
-         "class": "ajaxlink",
+         "class": "ajaxnav",
          "url": "parameters/",
          "img": "",
          "label": _("Parameters")},
@@ -99,11 +99,11 @@ def user_menu(user, selection):
 def uprefs_menu(selection, user):
     entries = [
         {"name": "profile",
-         "class": "ajaxlink",
+         "class": "ajaxnav",
          "url": "profile/",
          "label": _("Profile")},
         {"name": "preferences",
-         "class": "ajaxlink",
+         "class": "ajaxnav",
          "url": "preferences/",
          "label": _("Preferences")},
     ]
diff --git a/modoboa/extensions/admin/__init__.py b/modoboa/extensions/admin/__init__.py
index 050d3f6f2..22979bb6f 100644
--- a/modoboa/extensions/admin/__init__.py
+++ b/modoboa/extensions/admin/__init__.py
@@ -101,7 +101,7 @@ def user_menu(target, user):
         return []
     return [
         {"name": "forward",
-         "class": "ajaxlink",
+         "class": "ajaxnav",
          "url": "forward/",
          "label": ugettext_lazy("Forward")}
     ]
diff --git a/modoboa/extensions/admin/static/admin/js/admin.js b/modoboa/extensions/admin/static/admin/js/admin.js
index 9c54f4d80..398cfa959 100644
--- a/modoboa/extensions/admin/static/admin/js/admin.js
+++ b/modoboa/extensions/admin/static/admin/js/admin.js
@@ -258,7 +258,8 @@ Identities.prototype = {
 
     listen: function() {
         Admin.prototype.listen.call(this);
-        $(document).on("click", "a.ajaxlink", $.proxy(this.page_loader, this));
+        $(document).on("click", "a.ajaxnav", $.proxy(this.page_loader, this));
+        $(document).on("click", "a.ajaxcall", $.proxy(this.send_call, this));
     },
 
     page_loader: function(e) {
@@ -271,6 +272,27 @@ Identities.prototype = {
         this.navobj.baseurl($link.attr("href")).update();
     },
 
+    /**
+     * Send an ajax call.
+     */
+    send_call: function(evt) {
+        var $link = get_target(evt, "a");
+        var $this = $(this);
+        var method = $link.attr("data-call_method");
+
+        if (method === undefined) {
+            method = "GET";
+        }
+        evt.preventDefault();
+        $.ajax({
+            url: $link.attr("href"),
+            type: method,
+            dataType: "json"
+        }).done(function(data) {
+            $this.reload_listing(data.respmsg);
+        });
+    },
+
     /**
      * Initialize the links embedded within a page.
      *
diff --git a/modoboa/extensions/admin/templatetags/admin_tags.py b/modoboa/extensions/admin/templatetags/admin_tags.py
index 2d1060b61..abc4d2451 100644
--- a/modoboa/extensions/admin/templatetags/admin_tags.py
+++ b/modoboa/extensions/admin/templatetags/admin_tags.py
@@ -37,7 +37,7 @@ def domains_menu(selection, user):
         {"name": "domains",
          "label": _("List domains"),
          "img": "fa fa-user",
-         "class": "ajaxlink navigation",
+         "class": "ajaxnav navigation",
          "url": domain_list_url},
         {"name": "statistics",
          "label": _("Statistics"),
@@ -89,12 +89,12 @@ def identities_menu(user, selection=None):
         {"name": "identities",
          "label": _("List identities"),
          "img": "fa fa-user",
-         "class": "ajaxlink navigation",
+         "class": "ajaxnav navigation",
          "url": "list/"},
         {"name": "quotas",
          "label": _("List quotas"),
          "img": "fa fa-hdd-o",
-         "class": "ajaxlink navigation",
+         "class": "ajaxnav navigation",
          "url": "quotas/"},
         {"name": "newaccount",
          "label": _("Add account"),
diff --git a/modoboa/extensions/postfix_autoreply/general_callbacks.py b/modoboa/extensions/postfix_autoreply/general_callbacks.py
index d5e6f1f59..eb1417088 100644
--- a/modoboa/extensions/postfix_autoreply/general_callbacks.py
+++ b/modoboa/extensions/postfix_autoreply/general_callbacks.py
@@ -25,7 +25,7 @@ def menu(target, user):
         return []
     return [
         {"name": "autoreply",
-         "class": "ajaxlink",
+         "class": "ajaxnav",
          "url": "autoreply/",
          "label": ugettext_lazy("Auto-reply message")}
     ]
diff --git a/modoboa/static/js/twocols_nav.js b/modoboa/static/js/twocols_nav.js
index 3999e3c99..9094d549c 100644
--- a/modoboa/static/js/twocols_nav.js
+++ b/modoboa/static/js/twocols_nav.js
@@ -23,7 +23,7 @@ TwocolsNav.prototype = {
     },
 
     listen: function() {
-        $("a.ajaxlink").click($.proxy(this.load_section, this));
+        $("a.ajaxnav").click($.proxy(this.load_section, this));
         $(document).on("click", "#update", $.proxy(function(e) {
             simple_ajax_form_post(e, {
                 formid: this.options.formid,
@@ -130,7 +130,7 @@ TwocolsNav.prototype = {
      * Select an entry in the left menu based on current url.
      */
     select_left_menu: function() {
-        $("a.ajaxlink").parent().removeClass("active");
+        $("a.ajaxnav").parent().removeClass("active");
         $("a[name=" + this.navobj.getbaseurl() + "]").parent().addClass("active");
     },