diff --git a/modoboa/core/app_settings.py b/modoboa/core/app_settings.py
index 543672102..edb9bfe48 100644
--- a/modoboa/core/app_settings.py
+++ b/modoboa/core/app_settings.py
@@ -17,12 +17,16 @@ def enabled_applications():
     :return: a list
     """
     from modoboa.core.models import Extension
+    from modoboa.core.extensions import exts_pool
     from modoboa.lib.dbutils import db_table_exists
 
     result = [("user", "user")]
     if db_table_exists("core_extension"):
         exts = Extension.objects.filter(enabled=True)
-        result += [(ext.name, ext.name) for ext in exts]
+        for ext in exts:
+            extclass = exts_pool.get_extension(ext.name)
+            if extclass.available_for_topredirection:
+                result.append((ext.name, ext.name))
     return sorted(result, key=lambda e: e[0])
 
 
diff --git a/modoboa/core/extensions.py b/modoboa/core/extensions.py
index 4b399bd24..1eedc56a8 100644
--- a/modoboa/core/extensions.py
+++ b/modoboa/core/extensions.py
@@ -15,6 +15,7 @@ class ModoExtension(object):
     url = None
     needs_media = False
     always_active = False
+    available_for_topredirection = False
 
     def infos(self):
         return dict(
diff --git a/modoboa/extensions/amavis/__init__.py b/modoboa/extensions/amavis/__init__.py
index 9abc912ed..8a85d646c 100644
--- a/modoboa/extensions/amavis/__init__.py
+++ b/modoboa/extensions/amavis/__init__.py
@@ -21,6 +21,7 @@ class Amavis(ModoExtension):
     version = "1.0"
     description = ugettext_lazy("Simple amavis management frontend")
     url = "quarantine"
+    available_for_topredirection = True
 
     def init(self):
         """Init function
diff --git a/modoboa/extensions/sievefilters/__init__.py b/modoboa/extensions/sievefilters/__init__.py
index c5b88c95f..a6e437c6c 100644
--- a/modoboa/extensions/sievefilters/__init__.py
+++ b/modoboa/extensions/sievefilters/__init__.py
@@ -11,6 +11,7 @@ class SieveFilters(ModoExtension):
     version = "1.0"
     description = ugettext_lazy("Plugin to easily create server-side filters")
     url = "sfilters"
+    available_for_topredirection = True
 
     def load(self):
         from .app_settings import ParametersForm, UserSettings
diff --git a/modoboa/extensions/webmail/__init__.py b/modoboa/extensions/webmail/__init__.py
index 8b336b8b1..d673156f0 100644
--- a/modoboa/extensions/webmail/__init__.py
+++ b/modoboa/extensions/webmail/__init__.py
@@ -11,6 +11,7 @@ class Webmail(ModoExtension):
     version = "1.0"
     description = ugettext_lazy("Simple IMAP webmail")
     needs_media = True
+    available_for_topredirection = True
 
     def load(self):
         from .app_settings import ParametersForm, UserSettings