diff --git a/modoboa/extensions/limits/migrations/0002_load_initial_data.py b/modoboa/extensions/limits/migrations/0002_load_initial_data.py
index acedaf0d2..ef293c25b 100644
--- a/modoboa/extensions/limits/migrations/0002_load_initial_data.py
+++ b/modoboa/extensions/limits/migrations/0002_load_initial_data.py
@@ -1,39 +1,40 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import IntegrityError, models, migrations
+from django.db import models, migrations
 
+from modoboa.core.extensions import exts_pool
 from modoboa.lib.migration_tools import add_permissions_to_group
-from modoboa.extensions.limits import controls
+from modoboa.extensions.limits.midels import LimitTemplates
 
 
 def load_initial_data(apps, schema_editor):
     """Load initial data."""
-    ContentType = apps.get_model("contenttypes", "ContentType")
     Group = apps.get_model("auth", "Group")
     User = apps.get_model("core", "User")
-    Domain = apps.get_model("admin", "Domain")
+    LimitsPool = apps.get_model("limits", "LimitsPool")
+    Limit = apps.get_model("limits", "Limit")
 
-    ct = ContentType.objects.get(app_label="admin", model="domain")
     dagrp = Group.objects.get(name="DomainAdmins")
-
     grp = Group(name="Resellers")
     grp.save()
     grp.permissions.add(*dagrp.permissions.all())
-
-    ct = ContentType.objects.get_for_model(Domain)
     add_permissions_to_group(
-        apps, "Resellers", [("admin", "domain", "view_domains"),
-                            ("admin", "domain", "add_domain"),
-                            ("admin", "domain", "change_domain"),
-                            ("admin", "domain", "delete_domain")]
+        apps, grp, [("admin", "domain", "view_domains"),
+                    ("admin", "domain", "add_domain"),
+                    ("admin", "domain", "change_domain"),
+                    ("admin", "domain", "delete_domain")]
     )
+    if exts_pool.is_extension_installed(
+            "modoboa.extensions.postfix_relay_domains"):
+        from modoboa.extensions.postfix_relay_domains.modo_extension \
+            import RESELLERS_PERMISSIONS
+        add_permissions_to_group(apps, grp, RESELLERS_PERMISSIONS)
 
-    for user in User.objects.filter(groups__name='DomainAdmins'):
-        try:
-            controls.create_pool(user)
-        except IntegrityError:
-            pass
+    for user in User.objects.filter(groups__name="DomainAdmins"):
+        pool, created = LimitsPool.objects.get_or_create(user=user)
+        for tpl in LimitTemplates().templates():
+            Limit.objects.create(name=tpl[0], pool=pool, maxvalue=0)
 
 
 class Migration(migrations.Migration):
diff --git a/modoboa/extensions/postfix_relay_domains/migrations/0002_load_initial_data.py b/modoboa/extensions/postfix_relay_domains/migrations/0002_load_initial_data.py
index 85024719c..4be3e1d02 100644
--- a/modoboa/extensions/postfix_relay_domains/migrations/0002_load_initial_data.py
+++ b/modoboa/extensions/postfix_relay_domains/migrations/0002_load_initial_data.py
@@ -4,6 +4,9 @@ from __future__ import unicode_literals
 from django.db import models, migrations
 
 from modoboa.core.extensions import exts_pool
+from modoboa.lib.migration_tools import add_permissions_to_group
+
+from ..modo_extension import RESELLERS_PERMISSIONS
 
 
 def load_initial_data(apps, schema_editor):
@@ -16,11 +19,6 @@ def load_initial_data(apps, schema_editor):
         return
 
     Group = apps.get_model("auth", "Group")
-    Permission = apps.get_model("auth", "Permission")
-    ContentType = apps.get_model("contenttypes", "ContentType")
-    RelayDomain = apps.get_model("postfix_relay_domains", "RelayDomain")
-    RelayDomainAlias = apps.get_model(
-        "postfix_relay_domains", "RelayDomainAlias")
     LimitsPool = apps.get_model("limits", "LimitsPool")
     Limit = apps.get_model("limits", "Limit")
 
@@ -33,17 +31,7 @@ def load_initial_data(apps, schema_editor):
 
     # Add new permissions to the Resellers group.
     grp = Group.objects.get(name='Resellers')
-    for model in [RelayDomain, RelayDomainAlias, Service]:
-        ct = ContentType.objects.get_for_model(model)
-        name = model.__name__.lower()
-        for action in ['add', 'change', 'delete']:
-            grp.permissions.add(
-                Permission.objects.get(
-                    content_type=ct, codename='%s_%s' % (action, name)
-                )
-            )
-    grp.save()
-
+    add_permissions_to_group(apps, grp, RESELLERS_PERMISSIONS)
 
 
 class Migration(migrations.Migration):
diff --git a/modoboa/extensions/postfix_relay_domains/modo_extension.py b/modoboa/extensions/postfix_relay_domains/modo_extension.py
index 47819ba9a..ed212771f 100644
--- a/modoboa/extensions/postfix_relay_domains/modo_extension.py
+++ b/modoboa/extensions/postfix_relay_domains/modo_extension.py
@@ -18,6 +18,19 @@ EXTENSION_EVENTS = [
     "FillRelayDomainInstances"
 ]
 
+RESELLERS_PERMISSIONS = [
+    ("postfix_relay_domains", "relaydomain", "add_relaydomain"),
+    ("postfix_relay_domains", "relaydomain", "change_relaydomain"),
+    ("postfix_relay_domains", "relaydomain", "delete_relaydomain"),
+    ("postfix_relay_domains", "relaydomainalias", "add_relaydomainalias"),
+    ("postfix_relay_domains", "relaydomainalias", "change_relaydomainalias"),
+    ("postfix_relay_domains", "relaydomainalias", "delete_relaydomainalias"),
+    ("postfix_relay_domains", "service", "add_service"),
+    ("postfix_relay_domains", "service", "change_service"),
+    ("postfix_relay_domains", "service", "delete_service")
+]
+
+
 class PostfixRelayDomains(ModoExtension):
 
     """Extension declaration."""
diff --git a/modoboa/lib/permissions.py b/modoboa/lib/permissions.py
index 144fe1c62..5558bc3e6 100644
--- a/modoboa/lib/permissions.py
+++ b/modoboa/lib/permissions.py
@@ -1,7 +1,9 @@
 # coding: utf-8
+
 from django.contrib.contenttypes.models import ContentType
-from django.utils.translation import ugettext as _
 from django.db import IntegrityError
+from django.utils.translation import ugettext as _
+
 from modoboa.core.models import ObjectAccess, User
 from modoboa.lib import events