diff --git a/.travis.yml b/.travis.yml
index 066b49c97..ee3f38ff9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,19 @@
-sudo: false
 language: python
-cache: pip
 python:
   - "2.7"
   - "3.4"
+  - "3.5"
   - "3.6"
+
+env:
+  global:
+    - PYTHONWARNINGS="default,ignore::PendingDeprecationWarning,ignore::ResourceWarning"
+  matrix:
+    - DB="POSTGRESQL"
+    - DB="MYSQL"
+
+sudo: false
+
 addons:
   apt:
     packages:
@@ -12,30 +21,28 @@ addons:
       - postfix
       - slapd
 
-env:
-  - DB="POSTGRESQL"
-  - DB="MYSQL"
+cache: pip
 
 services:
-  - mysql
   - postgres
+  - mysql
 
 before_install:
   - pip install codecov
-  - if [[ $DB = 'POSTGRESQL' ]]; then pip install -q psycopg2; fi
-  - if [[ $DB = 'MYSQL' ]]; then pip install -q mysqlclient; fi
+  - if [[ $DB = "POSTGRESQL" ]]; then pip install -q psycopg2; fi
+  - if [[ $DB = "MYSQL" ]]; then pip install -q mysqlclient; fi
 
 install:
   - pip install -q -r requirements.txt
   - pip install -q -r ldap-requirements.txt
   - pip install -q -r test-requirements.txt
-  - pip install -e .
+  - python setup.py -q develop
 
 before_script:
-  - if [[ $DB = 'POSTGRESQL' ]]; then psql -c 'create database modoboa_test;' -U postgres; fi
-  - if [[ $DB = 'MYSQL' ]]; then mysql -e "create database IF NOT EXISTS modoboa_test;" -uroot; fi
-  - if [[ $DB = 'MYSQL' ]]; then mysql -e "CREATE USER 'modoboa'@'localhost' IDENTIFIED BY 'modoboa'" -uroot; fi
-  - if [[ $DB = 'MYSQL' ]]; then mysql -e "GRANT ALL PRIVILEGES ON * . * TO 'modoboa'@'localhost';" -uroot; fi
+  - if [[ $DB = "POSTGRESQL" ]]; then psql -c "CREATE DATABASE modoboa_test;" -U postgres; fi
+  - if [[ $DB = "MYSQL" ]]; then mysql -e "CREATE DATABASE IF NOT EXISTS modoboa_test;" -uroot; fi
+  - if [[ $DB = "MYSQL" ]]; then mysql -e "CREATE USER 'modoboa'@'localhost' IDENTIFIED BY 'modoboa'" -uroot; fi
+  - if [[ $DB = "MYSQL" ]]; then mysql -e "GRANT ALL PRIVILEGES ON * . * TO 'modoboa'@'localhost';" -uroot; fi
   - mkdir /tmp/slapd
   - slapd -f test_data/slapd.conf -h ldap://localhost:3389 &
   - sleep 3
diff --git a/ldap-requirements.txt b/ldap-requirements.txt
index 35eaac975..40145847b 100644
--- a/ldap-requirements.txt
+++ b/ldap-requirements.txt
@@ -1 +1 @@
-django-auth-ldap>=1.2.13
+django-auth-ldap>=1.3.0
diff --git a/modoboa/admin/forms/account.py b/modoboa/admin/forms/account.py
index 19effd8ab..e160b6530 100644
--- a/modoboa/admin/forms/account.py
+++ b/modoboa/admin/forms/account.py
@@ -6,7 +6,7 @@ from collections import OrderedDict
 from functools import reduce
 
 from django import forms
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.http import QueryDict
 from django.utils.translation import ugettext as _, ugettext_lazy
 
@@ -607,8 +607,6 @@ class AccountWizard(WizardForm):
         })
 
     def done(self):
-        from modoboa.lib.web_utils import render_to_json_response
-
         account = self.first_step.form.save()
         account.post_create(self.request.user)
         mailform = self.steps[1].form
diff --git a/modoboa/admin/forms/domain.py b/modoboa/admin/forms/domain.py
index 23e2e9343..558b6e89f 100644
--- a/modoboa/admin/forms/domain.py
+++ b/modoboa/admin/forms/domain.py
@@ -5,7 +5,7 @@ from __future__ import unicode_literals
 from functools import reduce
 
 from django import forms
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.http import QueryDict
 from django.utils.translation import ugettext as _, ugettext_lazy
 from django.utils.encoding import force_text
diff --git a/modoboa/admin/handlers.py b/modoboa/admin/handlers.py
index c51e01b27..da360c6d8 100644
--- a/modoboa/admin/handlers.py
+++ b/modoboa/admin/handlers.py
@@ -2,7 +2,7 @@
 
 from __future__ import unicode_literals
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.db.models import signals
 from django.dispatch import receiver
 from django.utils.translation import ugettext as _
diff --git a/modoboa/admin/migrations/0001_initial.py b/modoboa/admin/migrations/0001_initial.py
index ec5eb96bb..9be649089 100644
--- a/modoboa/admin/migrations/0001_initial.py
+++ b/modoboa/admin/migrations/0001_initial.py
@@ -31,8 +31,8 @@ class Migration(migrations.Migration):
             fields=[
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                 ('address', models.EmailField(max_length=75)),
-                ('alias', models.ForeignKey(to='admin.Alias')),
-                ('r_alias', models.ForeignKey(related_name='alias_recipient_aliases', blank=True, to='admin.Alias', null=True)),
+                ('alias', models.ForeignKey(to='admin.Alias', on_delete=models.CASCADE)),
+                ('r_alias', models.ForeignKey(related_name='alias_recipient_aliases', blank=True, to='admin.Alias', null=True, on_delete=models.CASCADE)),
             ],
             options={
                 'db_table': 'modoboa_admin_aliasrecipient',
@@ -85,7 +85,7 @@ class Migration(migrations.Migration):
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                 ('type', models.CharField(max_length=20, choices=[(b'rename', b'rename'), (b'delete', b'delete')])),
                 ('argument', models.TextField()),
-                ('mailbox', models.ForeignKey(blank=True, to='admin.Mailbox', null=True)),
+                ('mailbox', models.ForeignKey(blank=True, to='admin.Mailbox', null=True, on_delete=models.CASCADE)),
             ],
             options={
             },
@@ -116,43 +116,43 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='mailbox',
             name='dates',
-            field=models.ForeignKey(to='admin.ObjectDates'),
+            field=models.ForeignKey(to='admin.ObjectDates', on_delete=models.CASCADE),
             preserve_default=True,
         ),
         migrations.AddField(
             model_name='mailbox',
             name='domain',
-            field=models.ForeignKey(to='admin.Domain'),
+            field=models.ForeignKey(to='admin.Domain', on_delete=models.CASCADE),
             preserve_default=True,
         ),
         migrations.AddField(
             model_name='mailbox',
             name='user',
-            field=models.OneToOneField(to=settings.AUTH_USER_MODEL),
+            field=models.OneToOneField(to=settings.AUTH_USER_MODEL, on_delete=models.CASCADE),
             preserve_default=True,
         ),
         migrations.AddField(
             model_name='domainalias',
             name='dates',
-            field=models.ForeignKey(to='admin.ObjectDates'),
+            field=models.ForeignKey(to='admin.ObjectDates', on_delete=models.CASCADE),
             preserve_default=True,
         ),
         migrations.AddField(
             model_name='domainalias',
             name='target',
-            field=models.ForeignKey(verbose_name='target', to='admin.Domain', help_text='The domain this alias points to'),
+            field=models.ForeignKey(verbose_name='target', to='admin.Domain', help_text='The domain this alias points to', on_delete=models.CASCADE),
             preserve_default=True,
         ),
         migrations.AddField(
             model_name='domain',
             name='dates',
-            field=models.ForeignKey(to='admin.ObjectDates'),
+            field=models.ForeignKey(to='admin.ObjectDates', on_delete=models.CASCADE),
             preserve_default=True,
         ),
         migrations.AddField(
             model_name='aliasrecipient',
             name='r_mailbox',
-            field=models.ForeignKey(blank=True, to='admin.Mailbox', null=True),
+            field=models.ForeignKey(blank=True, to='admin.Mailbox', null=True, on_delete=models.CASCADE),
             preserve_default=True,
         ),
         migrations.AlterUniqueTogether(
@@ -162,13 +162,13 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='alias',
             name='dates',
-            field=models.ForeignKey(to='admin.ObjectDates'),
+            field=models.ForeignKey(to='admin.ObjectDates', on_delete=models.CASCADE),
             preserve_default=True,
         ),
         migrations.AddField(
             model_name='alias',
             name='domain',
-            field=models.ForeignKey(to='admin.Domain', null=True),
+            field=models.ForeignKey(to='admin.Domain', null=True, on_delete=models.CASCADE),
             preserve_default=True,
         ),
         migrations.AlterUniqueTogether(
diff --git a/modoboa/admin/models/alias.py b/modoboa/admin/models/alias.py
index 59b796725..225ed9e78 100644
--- a/modoboa/admin/models/alias.py
+++ b/modoboa/admin/models/alias.py
@@ -5,7 +5,7 @@ from __future__ import unicode_literals
 import hashlib
 import random
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.db import models
 from django.utils.encoding import (
     python_2_unicode_compatible, smart_text, force_str, force_bytes
@@ -37,7 +37,7 @@ class Alias(AdminObject):
             "The alias address."
         )
     )
-    domain = models.ForeignKey(Domain, null=True)
+    domain = models.ForeignKey(Domain, null=True, on_delete=models.CASCADE)
     enabled = models.BooleanField(
         ugettext_lazy("enabled"),
         help_text=ugettext_lazy("Check to activate this alias"),
@@ -210,13 +210,15 @@ class AliasRecipient(models.Model):
     """An alias recipient."""
 
     address = models.EmailField()
-    alias = models.ForeignKey(Alias)
+    alias = models.ForeignKey(Alias, on_delete=models.CASCADE)
 
     # if recipient is a local mailbox
-    r_mailbox = models.ForeignKey(Mailbox, blank=True, null=True)
+    r_mailbox = models.ForeignKey(Mailbox, blank=True, null=True,
+                                  on_delete=models.CASCADE)
     # if recipient is a local alias
     r_alias = models.ForeignKey(
-        Alias, related_name="alias_recipient_aliases", blank=True, null=True)
+        Alias, related_name="alias_recipient_aliases", blank=True, null=True,
+        on_delete=models.CASCADE)
 
     class Meta:
         app_label = "admin"
diff --git a/modoboa/admin/models/domain_alias.py b/modoboa/admin/models/domain_alias.py
index c9047886d..51ccfba69 100644
--- a/modoboa/admin/models/domain_alias.py
+++ b/modoboa/admin/models/domain_alias.py
@@ -40,7 +40,8 @@ class DomainAlias(AdminObject):
                             help_text=ugettext_lazy("The alias name"))
     target = models.ForeignKey(
         Domain, verbose_name=ugettext_lazy('target'),
-        help_text=ugettext_lazy("The domain this alias points to")
+        help_text=ugettext_lazy("The domain this alias points to"),
+        on_delete=models.CASCADE
     )
     enabled = models.BooleanField(
         ugettext_lazy('enabled'),
diff --git a/modoboa/admin/models/mailbox.py b/modoboa/admin/models/mailbox.py
index 1cf18320d..790cf9fbb 100644
--- a/modoboa/admin/models/mailbox.py
+++ b/modoboa/admin/models/mailbox.py
@@ -100,8 +100,8 @@ class Mailbox(AdminObject):
     )
     quota = models.PositiveIntegerField(default=0)
     use_domain_quota = models.BooleanField(default=False)
-    domain = models.ForeignKey(Domain)
-    user = models.OneToOneField(User)
+    domain = models.ForeignKey(Domain, on_delete=models.CASCADE)
+    user = models.OneToOneField(User, on_delete=models.CASCADE)
 
     objects = MailboxManager()
 
@@ -354,7 +354,7 @@ class SenderAddress(models.Model):
     """Extra sender address for Mailbox."""
 
     address = models.EmailField()
-    mailbox = models.ForeignKey(Mailbox)
+    mailbox = models.ForeignKey(Mailbox, on_delete=models.CASCADE)
 
     class Meta:
         app_label = "admin"
@@ -373,7 +373,8 @@ reversion.register(SenderAddress)
 class MailboxOperation(models.Model):
     """An operation on a mailbox."""
 
-    mailbox = models.ForeignKey(Mailbox, blank=True, null=True)
+    mailbox = models.ForeignKey(Mailbox, blank=True, null=True,
+                                on_delete=models.CASCADE)
     type = models.CharField(
         max_length=20, choices=(('rename', 'rename'), ('delete', 'delete'))
     )
diff --git a/modoboa/admin/models/mxrecord.py b/modoboa/admin/models/mxrecord.py
index c769da392..4a4f71e5b 100644
--- a/modoboa/admin/models/mxrecord.py
+++ b/modoboa/admin/models/mxrecord.py
@@ -37,14 +37,14 @@ class MXRecordManager(models.Manager):
         if records.exists():
             for record in records:
                 yield record
-            raise StopIteration()
+            return
 
         self.get_queryset().filter(domain=domain).delete()
 
         delta = datetime.timedelta(seconds=ttl)
         domain_mxs = lib.get_domain_mx_list(domain.name)
         if len(domain_mxs) == 0:
-            raise StopIteration
+            return
         for mx_addr, mx_ip_addr in domain_mxs:
             record = self.get_queryset().create(
                 domain=domain,
@@ -58,7 +58,7 @@ class MXRecordManager(models.Manager):
 class MXRecord(models.Model):
     """A model used to store MX records for Domain."""
 
-    domain = models.ForeignKey("admin.Domain")
+    domain = models.ForeignKey("admin.Domain", on_delete=models.CASCADE)
     name = models.CharField(max_length=254)
     address = models.GenericIPAddressField()
     managed = models.BooleanField(default=False)
@@ -86,9 +86,9 @@ class DNSBLQuerySet(models.QuerySet):
 class DNSBLResult(models.Model):
     """Store a DNSBL query result."""
 
-    domain = models.ForeignKey("admin.Domain")
+    domain = models.ForeignKey("admin.Domain", on_delete=models.CASCADE)
     provider = models.CharField(max_length=254, db_index=True)
-    mx = models.ForeignKey(MXRecord)
+    mx = models.ForeignKey(MXRecord, on_delete=models.CASCADE)
     status = models.CharField(max_length=45, blank=True, db_index=True)
 
     objects = models.Manager.from_queryset(DNSBLQuerySet)()
diff --git a/modoboa/admin/templatetags/admin_tags.py b/modoboa/admin/templatetags/admin_tags.py
index 750ce39c3..202088157 100644
--- a/modoboa/admin/templatetags/admin_tags.py
+++ b/modoboa/admin/templatetags/admin_tags.py
@@ -5,7 +5,7 @@ from __future__ import unicode_literals
 from functools import reduce
 
 from django import template
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.template.loader import render_to_string
 from django.utils.safestring import mark_safe
 from django.utils.translation import ugettext as _, ugettext_lazy
diff --git a/modoboa/admin/tests/test_account.py b/modoboa/admin/tests/test_account.py
index acf1baf9d..3f6f2144d 100644
--- a/modoboa/admin/tests/test_account.py
+++ b/modoboa/admin/tests/test_account.py
@@ -4,7 +4,7 @@ from __future__ import unicode_literals
 
 from unittest import skipIf
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.test import override_settings
 
 from modoboa.core import factories as core_factories
diff --git a/modoboa/admin/tests/test_alias.py b/modoboa/admin/tests/test_alias.py
index 046b85275..3df90621d 100644
--- a/modoboa/admin/tests/test_alias.py
+++ b/modoboa/admin/tests/test_alias.py
@@ -4,7 +4,7 @@ from __future__ import unicode_literals
 
 """Admin test cases."""
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from modoboa.core.models import User
 from modoboa.lib.tests import ModoTestCase
diff --git a/modoboa/admin/tests/test_api.py b/modoboa/admin/tests/test_api.py
index 6b0c0fbca..0a4cfbf59 100644
--- a/modoboa/admin/tests/test_api.py
+++ b/modoboa/admin/tests/test_api.py
@@ -9,7 +9,7 @@ import json
 import dns.resolver
 from mock import patch
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from rest_framework.authtoken.models import Token
 
diff --git a/modoboa/admin/tests/test_domain.py b/modoboa/admin/tests/test_domain.py
index b3eeabfeb..553a861a8 100644
--- a/modoboa/admin/tests/test_domain.py
+++ b/modoboa/admin/tests/test_domain.py
@@ -7,7 +7,7 @@ from __future__ import unicode_literals
 import dns.resolver
 from mock import patch
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from modoboa.core import factories as core_factories
 from modoboa.core.models import User
diff --git a/modoboa/admin/tests/test_domain_alias.py b/modoboa/admin/tests/test_domain_alias.py
index 76f92fb16..5dd667702 100644
--- a/modoboa/admin/tests/test_domain_alias.py
+++ b/modoboa/admin/tests/test_domain_alias.py
@@ -2,7 +2,7 @@
 
 from __future__ import unicode_literals
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from modoboa.lib.tests import ModoTestCase
 
diff --git a/modoboa/admin/tests/test_export.py b/modoboa/admin/tests/test_export.py
index f7ba5177f..c48e3486d 100644
--- a/modoboa/admin/tests/test_export.py
+++ b/modoboa/admin/tests/test_export.py
@@ -4,7 +4,7 @@
 
 from __future__ import unicode_literals
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.utils.encoding import force_text
 
 from modoboa.lib.tests import ModoTestCase
diff --git a/modoboa/admin/tests/test_import_.py b/modoboa/admin/tests/test_import_.py
index b40445f77..370c2087c 100644
--- a/modoboa/admin/tests/test_import_.py
+++ b/modoboa/admin/tests/test_import_.py
@@ -6,7 +6,7 @@ from mock import patch
 import dns.resolver
 
 from django.core.files.base import ContentFile
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from modoboa.core import factories as core_factories
 from modoboa.core.models import User
diff --git a/modoboa/admin/tests/test_mailbox_operations.py b/modoboa/admin/tests/test_mailbox_operations.py
index 2f9a719ee..81c02de97 100644
--- a/modoboa/admin/tests/test_mailbox_operations.py
+++ b/modoboa/admin/tests/test_mailbox_operations.py
@@ -9,7 +9,7 @@ import tempfile
 import mock
 
 from django.core.management import call_command
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.test import override_settings
 
 from modoboa.lib.tests import ModoTestCase
diff --git a/modoboa/admin/tests/test_mx.py b/modoboa/admin/tests/test_mx.py
index 2e2a39b10..53d2a94c6 100644
--- a/modoboa/admin/tests/test_mx.py
+++ b/modoboa/admin/tests/test_mx.py
@@ -6,7 +6,7 @@ from mock import patch
 
 from django.core import mail
 from django.core import management
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.test import override_settings
 
 from modoboa.core import factories as core_factories
diff --git a/modoboa/admin/tests/test_password_schemes.py b/modoboa/admin/tests/test_password_schemes.py
index 160d1e0b2..277d202b9 100644
--- a/modoboa/admin/tests/test_password_schemes.py
+++ b/modoboa/admin/tests/test_password_schemes.py
@@ -1,6 +1,6 @@
 from __future__ import unicode_literals
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from modoboa.core.models import User
 from modoboa.lib.tests import ModoTestCase
diff --git a/modoboa/admin/tests/test_user.py b/modoboa/admin/tests/test_user.py
index 2eccfc900..1c55760ff 100644
--- a/modoboa/admin/tests/test_user.py
+++ b/modoboa/admin/tests/test_user.py
@@ -2,7 +2,7 @@
 
 from __future__ import unicode_literals
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from modoboa.core.models import User
 from modoboa.lib.tests import ModoTestCase
diff --git a/modoboa/admin/views/alias.py b/modoboa/admin/views/alias.py
index 20b1c4635..a7c97f58b 100644
--- a/modoboa/admin/views/alias.py
+++ b/modoboa/admin/views/alias.py
@@ -2,7 +2,7 @@
 
 from __future__ import unicode_literals
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.db import IntegrityError
 from django.shortcuts import render
 from django.utils.translation import ugettext as _, ungettext
diff --git a/modoboa/admin/views/domain.py b/modoboa/admin/views/domain.py
index 2fd0f777e..4618b294a 100644
--- a/modoboa/admin/views/domain.py
+++ b/modoboa/admin/views/domain.py
@@ -4,7 +4,7 @@ from __future__ import unicode_literals
 
 from functools import reduce
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.db.models import Sum
 from django.http import HttpResponseRedirect
 from django.shortcuts import render
diff --git a/modoboa/admin/views/export.py b/modoboa/admin/views/export.py
index 89e6dabb0..f916ea8c5 100644
--- a/modoboa/admin/views/export.py
+++ b/modoboa/admin/views/export.py
@@ -9,7 +9,7 @@ from rfc6266 import build_header
 from django.contrib.auth.decorators import (
     login_required, permission_required, user_passes_test
 )
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.http import HttpResponse
 from django.shortcuts import render
 from django.utils.translation import ugettext as _
diff --git a/modoboa/admin/views/import_.py b/modoboa/admin/views/import_.py
index 44921471c..1291b41ee 100644
--- a/modoboa/admin/views/import_.py
+++ b/modoboa/admin/views/import_.py
@@ -9,7 +9,7 @@ from io import StringIO
 from django.contrib.auth.decorators import (
     login_required, permission_required, user_passes_test
 )
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.db import transaction
 from django.shortcuts import render
 from django.utils.translation import ugettext as _
diff --git a/modoboa/core/app_settings.py b/modoboa/core/app_settings.py
index ee7e699f6..0f69de5ad 100644
--- a/modoboa/core/app_settings.py
+++ b/modoboa/core/app_settings.py
@@ -11,7 +11,7 @@ from django.contrib.auth import password_validation
 from modoboa.lib import fields as lib_fields
 from modoboa.lib.cryptutils import random_key
 from modoboa.lib.form_utils import (
-    YesNoField, SeparatorField, InlineRadioSelect
+    YesNoField, SeparatorField, HorizontalRadioSelect
 )
 from modoboa.parameters import forms as param_forms
 from modoboa.parameters import tools as param_tools
@@ -44,7 +44,7 @@ class GeneralParametersForm(param_forms.AdminParametersForm):
                  ('ldap', "LDAP")],
         initial="local",
         help_text=ugettext_lazy("The backend used for authentication"),
-        widget=InlineRadioSelect
+        widget=HorizontalRadioSelect()
     )
 
     password_scheme = forms.ChoiceField(
diff --git a/modoboa/core/commands/deploy.py b/modoboa/core/commands/deploy.py
index e63ca890a..84c539a8e 100644
--- a/modoboa/core/commands/deploy.py
+++ b/modoboa/core/commands/deploy.py
@@ -28,7 +28,7 @@ from modoboa.core.commands import Command
 from modoboa.lib.api_client import ModoAPIClient
 
 if sys.version_info < (3, 0, 0):
-	input = raw_input
+    input = raw_input
 
 DBCONN_TPL = """
     '{{ conn_name }}': {
diff --git a/modoboa/core/commands/templates/settings.py.tpl b/modoboa/core/commands/templates/settings.py.tpl
index c61596c2e..af59cce7a 100644
--- a/modoboa/core/commands/templates/settings.py.tpl
+++ b/modoboa/core/commands/templates/settings.py.tpl
@@ -1,26 +1,31 @@
 """
 Django settings for {{ name }} project.
 
+Generated by 'django-admin startproject' using Django 1.11.8.
+
 For more information on this file, see
-https://docs.djangoproject.com/en/1.6/topics/settings/
+https://docs.djangoproject.com/en/1.11/topics/settings/
 
 For the full list of settings and their values, see
-https://docs.djangoproject.com/en/1.6/ref/settings/
+https://docs.djangoproject.com/en/1.11/ref/settings/
 """
 
-# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
-import os
-from logging.handlers import SysLogHandler
+from __future__ import unicode_literals
 
+from logging.handlers import SysLogHandler
+import os
 {% if devmode %}
-from modoboa.core.dev_settings import *
+
+from modoboa.core.dev_settings import *  # noqa
 {% endif %}
 
+
+# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 BASE_DIR = os.path.realpath(os.path.dirname(os.path.dirname(__file__)))
 
 
 # Quick-start development settings - unsuitable for production
-# See https://docs.djangoproject.com/en/1.6/howto/deployment/checklist/
+# See https://docs.djangoproject.com/en/1.11/howto/deployment/checklist/
 
 # SECURITY WARNING: keep the secret key used in production secret!
 SECRET_KEY = '{{ secret_key }}'
@@ -29,7 +34,7 @@ SECRET_KEY = '{{ secret_key }}'
 DEBUG = {{ devmode }}
 
 ALLOWED_HOSTS = [
-    '{{ allowed_host }}'
+    '{{ allowed_host }}',
 ]
 
 SITE_ID = 1
@@ -76,7 +81,7 @@ INSTALLED_APPS += MODOBOA_APPS
 
 AUTH_USER_MODEL = 'core.User'
 
-MIDDLEWARE_CLASSES = (
+MIDDLEWARE = (
     'x_forwarded_for.middleware.XForwardedForMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
@@ -131,14 +136,14 @@ WSGI_APPLICATION = '{{ name }}.wsgi.application'
 
 
 # Database
-# https://docs.djangoproject.com/en/1.6/ref/settings/#databases
+# https://docs.djangoproject.com/en/1.11/ref/settings/#databases
 
 DATABASES = {
     {% for conn in db_connections.values %}{{ conn|safe }}{% endfor %}
 }
 
 # Internationalization
-# https://docs.djangoproject.com/en/1.6/topics/i18n/
+# https://docs.djangoproject.com/en/1.11/topics/i18n/
 
 LANGUAGE_CODE = '{{ lang }}'
 
@@ -150,9 +155,8 @@ USE_L10N = True
 
 USE_TZ = True
 
-
 # Static files (CSS, JavaScript, Images)
-# https://docs.djangoproject.com/en/1.6/howto/static-files/
+# https://docs.djangoproject.com/en/1.11/howto/static-files/
 
 STATIC_URL = '/sitestatic/'
 STATIC_ROOT = os.path.join(BASE_DIR, 'sitestatic')
@@ -173,13 +177,14 @@ REST_FRAMEWORK = {
 }
 
 # Modoboa settings
-#MODOBOA_CUSTOM_LOGO = os.path.join(MEDIA_URL, "custom_logo.png")
+# MODOBOA_CUSTOM_LOGO = os.path.join(MEDIA_URL, "custom_logo.png")
 
-#DOVECOT_LOOKUP_PATH = ('/path/to/dovecot', )
+# DOVECOT_LOOKUP_PATH = ('/path/to/dovecot', )
 
 MODOBOA_API_URL = 'https://api.modoboa.org/1/'
 
-# Password validation rules
+# Password validation
+# https://docs.djangoproject.com/en/1.11/ref/settings/#auth-password-validators
 
 AUTH_PASSWORD_VALIDATORS = [
     {
@@ -276,5 +281,5 @@ try:
     from {{ extension }} import settings as {{ extension }}_settings
     {{ extension }}_settings.apply(globals())
 except AttributeError:
-    from {{ extension }}.settings import *
+    from {{ extension }}.settings import *  # noqa
 {% endfor %}
diff --git a/modoboa/core/handlers.py b/modoboa/core/handlers.py
index c146dc89f..d5983626e 100644
--- a/modoboa/core/handlers.py
+++ b/modoboa/core/handlers.py
@@ -4,7 +4,7 @@ from __future__ import unicode_literals
 
 import logging
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.db.models import signals
 from django.dispatch import receiver
 from django.utils.encoding import smart_text
@@ -13,6 +13,7 @@ from django.utils.translation import ugettext as _
 from django.contrib.sites import models as sites_models
 
 from reversion import revisions as reversion
+from reversion.models import Version
 
 from modoboa.lib import exceptions
 from modoboa.lib import permissions
@@ -32,14 +33,12 @@ def post_revision_commit(sender, **kwargs):
     django-reversion for that.
 
     """
-    from modoboa.lib.signals import get_request
-
     current_user = get_request().user.username
     logger = logging.getLogger("modoboa.admin")
     for version in kwargs["versions"]:
         if version.object is None:
             continue
-        prev_revisions = reversion.get_for_object(version.object)
+        prev_revisions = Version.objects.get_for_object(version.object)
         if prev_revisions.count() == 1:
             action = _("added")
             level = "info"
@@ -60,11 +59,9 @@ def log_object_removal(sender, instance, **kwargs):
 
     We want to know who was responsible for an object deletion.
     """
-    from reversion.models import Version
-
     if not reversion.is_registered(sender):
         return
-    del_list = reversion.get_deleted(sender)
+    del_list = Version.objects.get_deleted(sender)
     try:
         version = del_list.get(object_id=instance.id)
     except Version.DoesNotExist:
diff --git a/modoboa/core/middleware.py b/modoboa/core/middleware.py
index f8f66b403..df8f6939a 100644
--- a/modoboa/core/middleware.py
+++ b/modoboa/core/middleware.py
@@ -2,10 +2,12 @@
 
 from __future__ import unicode_literals
 
+from django.utils.deprecation import MiddlewareMixin
+
 from . import models
 
 
-class LocalConfigMiddleware(object):
+class LocalConfigMiddleware(MiddlewareMixin):
     """A middleware to inject LocalConfig into request."""
 
     def process_request(self, request):
diff --git a/modoboa/core/migrations/0001_initial.py b/modoboa/core/migrations/0001_initial.py
index 3824558f1..1be0eae38 100644
--- a/modoboa/core/migrations/0001_initial.py
+++ b/modoboa/core/migrations/0001_initial.py
@@ -67,8 +67,8 @@ class Migration(migrations.Migration):
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                 ('object_id', models.PositiveIntegerField()),
                 ('is_owner', models.BooleanField(default=False)),
-                ('content_type', models.ForeignKey(to='contenttypes.ContentType')),
-                ('user', models.ForeignKey(to=settings.AUTH_USER_MODEL)),
+                ('content_type', models.ForeignKey(to='contenttypes.ContentType', on_delete=models.CASCADE)),
+                ('user', models.ForeignKey(to=settings.AUTH_USER_MODEL, on_delete=models.CASCADE)),
             ],
             options={
             },
diff --git a/modoboa/core/models.py b/modoboa/core/models.py
index 0d2b203f4..4750f645e 100644
--- a/modoboa/core/models.py
+++ b/modoboa/core/models.py
@@ -5,7 +5,7 @@ from __future__ import unicode_literals
 from email.header import Header
 import re
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.db import models
 from django.utils.encoding import (
     python_2_unicode_compatible, smart_bytes, smart_text, force_str
@@ -407,8 +407,8 @@ def populate_callback(user, group="SimpleUsers"):
 
 @python_2_unicode_compatible
 class ObjectAccess(models.Model):
-    user = models.ForeignKey(User)
-    content_type = models.ForeignKey(ContentType)
+    user = models.ForeignKey(User, on_delete=models.CASCADE)
+    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
     object_id = models.PositiveIntegerField()
     content_object = GenericForeignKey('content_type', 'object_id')
     is_owner = models.BooleanField(default=False)
@@ -435,7 +435,7 @@ class LocalConfig(models.Model):
     """Store instance configuration here."""
 
     api_pk = models.PositiveIntegerField(null=True)
-    site = models.ForeignKey("sites.Site")
+    site = models.ForeignKey("sites.Site", on_delete=models.CASCADE)
 
     # API results cache
     api_versions = jsonfield.JSONField()
diff --git a/modoboa/core/password_hashers/advanced.py b/modoboa/core/password_hashers/advanced.py
index ad27ae865..0f526221c 100644
--- a/modoboa/core/password_hashers/advanced.py
+++ b/modoboa/core/password_hashers/advanced.py
@@ -34,7 +34,8 @@ class BLFCRYPTHasher(PasswordHasher):
         # rounds = parameters.get_global_parameter("rounds_number")
         # To get around this, I use the default of 12.
         rounds = 12
-        return bcrypt.encrypt(clearvalue, rounds=rounds)
+        bcrypt.using(rounds=rounds)
+        return bcrypt.hash(clearvalue)
 
     def verify(self, clearvalue, hashed_value):
         return bcrypt.verify(clearvalue, hashed_value)
@@ -55,7 +56,7 @@ class MD5CRYPTHasher(PasswordHasher):
         return pwhash
 
     def _encrypt(self, clearvalue, salt=None):
-        return md5_crypt.encrypt(clearvalue)
+        return md5_crypt.hash(clearvalue)
 
     def verify(self, clearvalue, hashed_value):
         return md5_crypt.verify(clearvalue, hashed_value)
@@ -78,7 +79,8 @@ class SHA256CRYPTHasher(PasswordHasher):
 
     def _encrypt(self, clearvalue, salt=None):
         rounds = param_tools.get_global_parameter("rounds_number")
-        return sha256_crypt.encrypt(clearvalue, rounds=rounds)
+        sha256_crypt.using(rounds=rounds)
+        return sha256_crypt.hash(clearvalue)
 
     def verify(self, clearvalue, hashed_value):
         return sha256_crypt.verify(clearvalue, hashed_value)
@@ -101,7 +103,8 @@ class SHA512CRYPTHasher(PasswordHasher):
 
     def _encrypt(self, clearvalue, salt=None):
         rounds = param_tools.get_global_parameter("rounds_number")
-        return sha512_crypt.encrypt(clearvalue, rounds=rounds)
+        sha512_crypt.using(rounds=rounds)
+        return sha512_crypt.hash(clearvalue)
 
     def verify(self, clearvalue, hashed_value):
         return sha512_crypt.verify(clearvalue, hashed_value)
diff --git a/modoboa/core/templatetags/core_tags.py b/modoboa/core/templatetags/core_tags.py
index 44d0735a4..25ef503af 100644
--- a/modoboa/core/templatetags/core_tags.py
+++ b/modoboa/core/templatetags/core_tags.py
@@ -10,7 +10,7 @@ import re
 
 from django import template
 from django.conf import settings
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.template.loader import render_to_string
 from django.utils import timezone
 from django.utils.encoding import smart_text
@@ -158,7 +158,7 @@ def colorize_level(level):
 @register.filter
 def tohtml(message):
     """Simple tag to format a text using HTML."""
-    return re.sub(r"'(.*?)'", "<strong>\g<1></strong>", message)
+    return re.sub(r"'(.*?)'", r"<strong>\g<1></strong>", message)
 
 
 @register.simple_tag
diff --git a/modoboa/core/tests/test_authentication.py b/modoboa/core/tests/test_authentication.py
index 22df9d964..08c7fb4dc 100644
--- a/modoboa/core/tests/test_authentication.py
+++ b/modoboa/core/tests/test_authentication.py
@@ -10,7 +10,7 @@ from unittest import skipIf
 from mock import patch
 
 from django.core import mail
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.test import override_settings
 
 from modoboa.lib.tests import ModoTestCase
diff --git a/modoboa/core/tests/test_core.py b/modoboa/core/tests/test_core.py
index 6ca505c39..5efa811c5 100644
--- a/modoboa/core/tests/test_core.py
+++ b/modoboa/core/tests/test_core.py
@@ -8,7 +8,7 @@ from dateutil.relativedelta import relativedelta
 from six import StringIO
 
 from django.core import management
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.test import TestCase
 from django.utils import timezone
 
diff --git a/modoboa/core/tests/test_ldap.py b/modoboa/core/tests/test_ldap.py
index d7b166594..2de9be271 100644
--- a/modoboa/core/tests/test_ldap.py
+++ b/modoboa/core/tests/test_ldap.py
@@ -4,7 +4,7 @@ from __future__ import unicode_literals
 
 from unittest import skipIf
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.test import override_settings
 from django.utils.functional import cached_property
 
diff --git a/modoboa/core/tests/test_views.py b/modoboa/core/tests/test_views.py
index 8e06bdfce..0c433c16b 100644
--- a/modoboa/core/tests/test_views.py
+++ b/modoboa/core/tests/test_views.py
@@ -5,7 +5,7 @@ from __future__ import unicode_literals
 from testfixtures import compare
 
 from django import forms
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from modoboa.lib.tests import ModoTestCase
 from modoboa.parameters import forms as param_forms
diff --git a/modoboa/core/views/auth.py b/modoboa/core/views/auth.py
index 2ca28c56a..577263144 100644
--- a/modoboa/core/views/auth.py
+++ b/modoboa/core/views/auth.py
@@ -5,7 +5,7 @@ from __future__ import unicode_literals
 
 import logging
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.http import HttpResponse, HttpResponseRedirect
 from django.template.loader import render_to_string
 from django.utils import translation
diff --git a/modoboa/core/views/base.py b/modoboa/core/views/base.py
index 8d4634bf3..7b6291bac 100644
--- a/modoboa/core/views/base.py
+++ b/modoboa/core/views/base.py
@@ -2,7 +2,7 @@
 
 from __future__ import unicode_literals
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.utils.http import is_safe_url
 from django.views import generic
 
diff --git a/modoboa/lib/authbackends.py b/modoboa/lib/authbackends.py
index 995c24272..b46db0855 100644
--- a/modoboa/lib/authbackends.py
+++ b/modoboa/lib/authbackends.py
@@ -29,9 +29,9 @@ class SMTPBackend(object):
             smtp.login(username, password)
         except smtplib.SMTPException:
             return None
-        return self.get_or_create_user(username)
+        return self.get_or_build_user(username)
 
-    def get_or_create_user(self, username):
+    def get_or_build_user(self, username):
         """Get a user or create it the first time.
 
         .. note::
@@ -71,7 +71,7 @@ try:
             self.global_params = dict(
                 param_tools.get_global_parameters("core"))
 
-        def get_or_create_user(self, username, ldap_user):
+        def get_or_build_user(self, username, ldap_user):
             """
             This must return a (User, created) 2-tuple for the given
             LDAP user.  username is the Django-friendly username of
diff --git a/modoboa/lib/form_utils.py b/modoboa/lib/form_utils.py
index 9aa259ff7..74abb7a37 100644
--- a/modoboa/lib/form_utils.py
+++ b/modoboa/lib/form_utils.py
@@ -11,12 +11,8 @@ import re
 from django.forms import TypedChoiceField
 from django.forms.fields import Field
 from django.forms.widgets import RadioSelect
-from django.forms.widgets import RadioChoiceInput
 from django.shortcuts import render
-from django.utils.encoding import (
-    python_2_unicode_compatible, force_text, force_str)
-from django.utils.html import conditional_escape
-from django.utils.safestring import mark_safe
+from django.utils.encoding import force_str
 from django.utils.translation import ugettext as _, ugettext_lazy
 
 from modoboa.lib.exceptions import BadRequest
@@ -198,6 +194,9 @@ class DynamicForm(object):
 
     """
 
+    fields = {}
+    data = {}
+
     def _create_field(self, typ, name, value=None, pos=None):
         """Create a new form field.
         """
@@ -371,41 +370,9 @@ class TabForms(object):
 #
 
 
-@python_2_unicode_compatible
-class CustomRadioInput(RadioChoiceInput):
-    """Custom radio input."""
-
-    def __str__(self):
-        if "id" in self.attrs:
-            label_for = ' for="%s"' % self.attrs["id"]
-        else:
-            label_for = ""
-        choice_label = conditional_escape(force_text(self.choice_label))
-        return mark_safe(
-            "<label class='radio-inline' %s>%s %s</label>"
-            % (label_for, self.tag(), choice_label)
-        )
-
-
-class InlineRadioRenderer(RadioSelect.renderer):
-    """Custom inline radio renderer."""
-
-    def __iter__(self):
-        for i, choice in enumerate(self.choices):
-            yield CustomRadioInput(
-                self.name, self.value, self.attrs.copy(), choice, i
-            )
-
-    def render(self):
-        return mark_safe(
-            u"\n".join([u"%s\n" % force_text(w) for w in self])
-        )
-
-
-class InlineRadioSelect(RadioSelect):
-    """Custom inline radio widget."""
-
-    renderer = InlineRadioRenderer
+class HorizontalRadioSelect(RadioSelect):
+    template_name = "common/horizontal_select.html"
+    option_template_name = "common/horizontal_select_option.html"
 
 
 class SeparatorField(Field):
@@ -426,7 +393,7 @@ class YesNoField(TypedChoiceField):
                 (True, ugettext_lazy("Yes")),
                 (False, ugettext_lazy("No"))
             ),
-            "widget": InlineRadioSelect,
+            "widget": HorizontalRadioSelect(),
             "coerce": lambda x: x == "True"
         })
         super(YesNoField, self).__init__(*args, **kwargs)
diff --git a/modoboa/lib/middleware.py b/modoboa/lib/middleware.py
index 6fd7c77f2..684726d65 100644
--- a/modoboa/lib/middleware.py
+++ b/modoboa/lib/middleware.py
@@ -6,6 +6,7 @@ from __future__ import unicode_literals
 
 from django.http import HttpResponseRedirect
 from django.utils.encoding import smart_text
+from django.utils.deprecation import MiddlewareMixin
 
 from modoboa.lib.exceptions import ModoboaException
 from modoboa.lib import signals as lib_signals
@@ -14,7 +15,7 @@ from modoboa.lib.web_utils import (
 )
 
 
-class AjaxLoginRedirect(object):
+class AjaxLoginRedirect(MiddlewareMixin):
 
     def process_response(self, request, response):
         if request.is_ajax():
@@ -23,7 +24,7 @@ class AjaxLoginRedirect(object):
         return response
 
 
-class CommonExceptionCatcher(object):
+class CommonExceptionCatcher(MiddlewareMixin):
     """Modoboa exceptions catcher."""
 
     def process_exception(self, request, exception):
@@ -44,7 +45,7 @@ class CommonExceptionCatcher(object):
         )
 
 
-class RequestCatcherMiddleware(object):
+class RequestCatcherMiddleware(MiddlewareMixin):
     """Simple middleware to store the current request."""
 
     def process_request(self, request):
diff --git a/modoboa/lib/migrations/0001_initial.py b/modoboa/lib/migrations/0001_initial.py
index 02453b798..6f5cd6f93 100644
--- a/modoboa/lib/migrations/0001_initial.py
+++ b/modoboa/lib/migrations/0001_initial.py
@@ -29,7 +29,7 @@ class Migration(migrations.Migration):
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                 ('name', models.CharField(max_length=255)),
                 ('value', models.CharField(max_length=255)),
-                ('user', models.ForeignKey(to=settings.AUTH_USER_MODEL)),
+                ('user', models.ForeignKey(to=settings.AUTH_USER_MODEL, on_delete=models.CASCADE)),
             ],
             options={
             },
diff --git a/modoboa/lib/permissions.py b/modoboa/lib/permissions.py
index 72a14621e..73cc4439c 100644
--- a/modoboa/lib/permissions.py
+++ b/modoboa/lib/permissions.py
@@ -51,8 +51,6 @@ def grant_access_to_object(user, obj, is_owner=False):
     :param obj: an admin. object (Domain, Mailbox, ...)
     :param is_owner: the user is the unique object's owner
     """
-    from modoboa.core.models import User
-
     ct = ContentType.objects.get_for_model(obj)
     entry, created = ObjectAccess.objects.get_or_create(
         user=user, content_type=ct, object_id=obj.id)
diff --git a/modoboa/lib/validators.py b/modoboa/lib/validators.py
index c440eb805..bd5e29918 100644
--- a/modoboa/lib/validators.py
+++ b/modoboa/lib/validators.py
@@ -34,6 +34,7 @@ class HostnameValidator(object):
         if not self.regex.match(value):
             raise ValidationError(self.message, self.code)
 
+
 validate_hostname = HostnameValidator()
 
 
@@ -42,15 +43,16 @@ class UTF8EmailValidator(EmailValidator):
     """Validator for addresses using non-ASCII characters."""
 
     # unicode letters range (must be a unicode string, not a raw string)
-    ul = u"\u00a1-\uffff"
-    ascii_set = u"-!#$%&'*+/=?^_`{}|~0-9A-Z"
+    ul = "\u00a1-\uffff"
+    ascii_set = "-!#$%&'*+/=?^_`{}|~0-9A-Z"
     user_regex_raw = (
         # dot-atom
-        r"^[" + ascii_set + ul + "]+(\.[" + ascii_set + ul + "]+)*\Z"
+        r"^[" + ascii_set + ul + r"]+(\.[" + ascii_set + ul + r"]+)*\Z"
         # quoted-string
         r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-\011\013\014\016-\177])*"\Z)'
     )
-    user_regex = re.compile("(" + user_regex_raw, re.IGNORECASE)
+    user_regex = re.compile(r"(" + user_regex_raw, re.IGNORECASE)
+
 
 validate_utf8_email = UTF8EmailValidator()
 
@@ -62,4 +64,5 @@ class UTF8AndEmptyUserEmailValidator(UTF8EmailValidator):
     user_regex = re.compile(
         r"(^$|" + UTF8EmailValidator.user_regex_raw, re.IGNORECASE)
 
+
 validate_utf8_and_empty_user_email = UTF8AndEmptyUserEmailValidator()
diff --git a/modoboa/lib/web_utils.py b/modoboa/lib/web_utils.py
index 555a1ebf4..2596c94de 100644
--- a/modoboa/lib/web_utils.py
+++ b/modoboa/lib/web_utils.py
@@ -114,9 +114,9 @@ def size2integer(value):
     :param value: the string to convert
     :return: the corresponding integer value
     """
-    m = re.match("(\d+)\s*(\w+)", value)
+    m = re.match(r"(\d+)\s*(\w+)", value)
     if m is None:
-        if re.match("\d+", value):
+        if re.match(r"\d+", value):
             return int(value)
         return 0
     if m.group(2)[0] in ["K", "k"]:
diff --git a/modoboa/limits/migrations/0001_initial.py b/modoboa/limits/migrations/0001_initial.py
index 468235c9b..2c1d96230 100644
--- a/modoboa/limits/migrations/0001_initial.py
+++ b/modoboa/limits/migrations/0001_initial.py
@@ -29,7 +29,7 @@ class Migration(migrations.Migration):
             name='LimitsPool',
             fields=[
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
-                ('user', models.OneToOneField(to=settings.AUTH_USER_MODEL)),
+                ('user', models.OneToOneField(to=settings.AUTH_USER_MODEL, on_delete=models.CASCADE)),
             ],
             options={
                 'db_table': 'limits_limitspool',
@@ -39,7 +39,7 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='limit',
             name='pool',
-            field=models.ForeignKey(to='limits.LimitsPool'),
+            field=models.ForeignKey(to='limits.LimitsPool', on_delete=models.CASCADE),
             preserve_default=True,
         ),
         migrations.AlterUniqueTogether(
diff --git a/modoboa/limits/migrations/0003_auto_20160413_1046.py b/modoboa/limits/migrations/0003_auto_20160413_1046.py
index 438479931..625a90568 100644
--- a/modoboa/limits/migrations/0003_auto_20160413_1046.py
+++ b/modoboa/limits/migrations/0003_auto_20160413_1046.py
@@ -58,8 +58,8 @@ class Migration(migrations.Migration):
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                 ('name', models.CharField(max_length=254)),
                 ('max_value', models.IntegerField(default=-2)),
-                ('content_type', models.ForeignKey(to='contenttypes.ContentType')),
-                ('user', models.ForeignKey(to=settings.AUTH_USER_MODEL)),
+                ('content_type', models.ForeignKey(to='contenttypes.ContentType', on_delete=models.CASCADE)),
+                ('user', models.ForeignKey(to=settings.AUTH_USER_MODEL, on_delete=models.CASCADE)),
             ],
         ),
         migrations.AlterUniqueTogether(
diff --git a/modoboa/limits/migrations/0005_auto_20160415_1654.py b/modoboa/limits/migrations/0005_auto_20160415_1654.py
index ab97e7807..9b05b9f08 100644
--- a/modoboa/limits/migrations/0005_auto_20160415_1654.py
+++ b/modoboa/limits/migrations/0005_auto_20160415_1654.py
@@ -33,7 +33,7 @@ class Migration(migrations.Migration):
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                 ('name', models.CharField(max_length=254)),
                 ('max_value', models.IntegerField(default=0)),
-                ('domain', models.ForeignKey(to='admin.Domain')),
+                ('domain', models.ForeignKey(to='admin.Domain', on_delete=models.CASCADE)),
             ],
             bases=(modoboa.limits.models.ObjectLimitMixin, models.Model),
         ),
diff --git a/modoboa/limits/models.py b/modoboa/limits/models.py
index 0797a7557..114a933c6 100644
--- a/modoboa/limits/models.py
+++ b/modoboa/limits/models.py
@@ -69,9 +69,10 @@ class ObjectLimitMixin(object):
 class UserObjectLimit(ObjectLimitMixin, models.Model):
     """Object level limit."""
 
-    user = models.ForeignKey(settings.AUTH_USER_MODEL)
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
     name = models.CharField(max_length=254)
-    content_type = models.ForeignKey("contenttypes.ContentType")
+    content_type = models.ForeignKey("contenttypes.ContentType",
+                                     on_delete=models.CASCADE)
     max_value = models.IntegerField(default=0)
 
     class Meta(object):
@@ -132,7 +133,7 @@ class UserObjectLimit(ObjectLimitMixin, models.Model):
 class DomainObjectLimit(ObjectLimitMixin, models.Model):
     """Per-domain limits on object creation."""
 
-    domain = models.ForeignKey("admin.Domain")
+    domain = models.ForeignKey("admin.Domain", on_delete=models.CASCADE)
     name = models.CharField(max_length=254)
     max_value = models.IntegerField(default=0)
 
diff --git a/modoboa/limits/tests/test_api.py b/modoboa/limits/tests/test_api.py
index ecfbe9d8f..4707c244b 100644
--- a/modoboa/limits/tests/test_api.py
+++ b/modoboa/limits/tests/test_api.py
@@ -5,7 +5,7 @@ from __future__ import unicode_literals
 
 from testfixtures import compare
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from rest_framework.authtoken.models import Token
 
diff --git a/modoboa/limits/tests/test_domain_limits.py b/modoboa/limits/tests/test_domain_limits.py
index 3d9f44f99..92f6c8749 100644
--- a/modoboa/limits/tests/test_domain_limits.py
+++ b/modoboa/limits/tests/test_domain_limits.py
@@ -3,7 +3,7 @@
 
 from __future__ import unicode_literals
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from modoboa.admin import factories as admin_factories
 from modoboa.admin.models import Domain
diff --git a/modoboa/limits/tests/test_import.py b/modoboa/limits/tests/test_import.py
index dc743b438..1b61fd0c5 100644
--- a/modoboa/limits/tests/test_import.py
+++ b/modoboa/limits/tests/test_import.py
@@ -3,7 +3,7 @@
 from __future__ import unicode_literals
 
 from django.core.files.base import ContentFile
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from modoboa.admin import factories as admin_factories
 from modoboa.admin import models as admin_models
diff --git a/modoboa/limits/tests/test_user_limits.py b/modoboa/limits/tests/test_user_limits.py
index 2d87d0a72..39168a24b 100644
--- a/modoboa/limits/tests/test_user_limits.py
+++ b/modoboa/limits/tests/test_user_limits.py
@@ -3,7 +3,7 @@
 
 from __future__ import unicode_literals
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from modoboa.admin.factories import populate_database
 from modoboa.admin.models import Alias, Domain
diff --git a/modoboa/relaydomains/migrations/0001_initial.py b/modoboa/relaydomains/migrations/0001_initial.py
index 0f6bff791..84cf66c6a 100644
--- a/modoboa/relaydomains/migrations/0001_initial.py
+++ b/modoboa/relaydomains/migrations/0001_initial.py
@@ -17,8 +17,8 @@ class Migration(migrations.Migration):
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                 ('target_host', models.CharField(help_text='Remote destination of this domain', max_length=255, verbose_name='target host')),
                 ('verify_recipients', models.BooleanField(default=False, help_text='Check for valid recipients', verbose_name='verify recipients')),
-                ('dates', models.ForeignKey(to='admin.ObjectDates')),
-                ('domain', models.OneToOneField(null=True, to='admin.Domain')),
+                ('dates', models.ForeignKey(to='admin.ObjectDates', on_delete=models.CASCADE)),
+                ('domain', models.OneToOneField(null=True, to='admin.Domain', on_delete=models.CASCADE)),
             ],
             options={
                 'ordering': ['domain__name'],
@@ -40,7 +40,7 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='relaydomain',
             name='service',
-            field=models.ForeignKey(to='relaydomains.Service'),
+            field=models.ForeignKey(to='relaydomains.Service', on_delete=models.CASCADE),
             preserve_default=True,
         ),
     ]
diff --git a/modoboa/relaydomains/tests.py b/modoboa/relaydomains/tests.py
index e071fee22..86c1e4fef 100644
--- a/modoboa/relaydomains/tests.py
+++ b/modoboa/relaydomains/tests.py
@@ -3,7 +3,7 @@
 from __future__ import unicode_literals
 
 from django.core.files.base import ContentFile
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.test import TestCase
 
 from modoboa.admin import factories as admin_factories
diff --git a/modoboa/templates/common/horizontal_select.html b/modoboa/templates/common/horizontal_select.html
new file mode 100644
index 000000000..d7145f734
--- /dev/null
+++ b/modoboa/templates/common/horizontal_select.html
@@ -0,0 +1,7 @@
+{% with id=widget.attrs.id %}<div{% if id %} id="{{ id }}"{% endif %}{% if widget.attrs.class %} class="{{ widget.attrs.class }}"{% endif %}>
+  {% for group, options, index in widget.optgroups %}
+    {% for option in options %}
+      {% include option.template_name with widget=option %}
+    {% endfor %}
+  {% endfor %}
+</div>{% endwith %}
\ No newline at end of file
diff --git a/modoboa/templates/common/horizontal_select_option.html b/modoboa/templates/common/horizontal_select_option.html
new file mode 100644
index 000000000..80f603bf9
--- /dev/null
+++ b/modoboa/templates/common/horizontal_select_option.html
@@ -0,0 +1,2 @@
+
+{% if wrap_label %}<label{% if widget.attrs.id %} for="{{ widget.attrs.id }}"{% endif %}{% if widget.attrs.id %} for="{{ widget.attrs.id }}"{% endif %} class="radio-inline">{% endif %}{% include "django/forms/widgets/input.html" %}{% if wrap_label %} {{ widget.label }}</label>{% endif %}
\ No newline at end of file
diff --git a/modoboa/transport/handlers.py b/modoboa/transport/handlers.py
index 91a581022..aae87601a 100644
--- a/modoboa/transport/handlers.py
+++ b/modoboa/transport/handlers.py
@@ -2,7 +2,7 @@
 
 from __future__ import unicode_literals
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.dispatch import receiver
 from django.utils.translation import ugettext as _
 
diff --git a/modoboa/transport/tests.py b/modoboa/transport/tests.py
index 052128fd6..5a35dd917 100644
--- a/modoboa/transport/tests.py
+++ b/modoboa/transport/tests.py
@@ -2,7 +2,7 @@
 
 import json
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from modoboa.lib.tests import ModoAPITestCase, ModoTestCase
 
diff --git a/modoboa/transport/urls.py b/modoboa/transport/urls.py
index 9a7319ac0..18b430451 100644
--- a/modoboa/transport/urls.py
+++ b/modoboa/transport/urls.py
@@ -8,10 +8,10 @@ from . import views
 urlpatterns = [
     url(r"^$", views.TransportListView.as_view(),
         name="transport_list"),
-    url("^create/$", views.TransportCreateView.as_view(),
+    url(r"^create/$", views.TransportCreateView.as_view(),
         name="transport_create"),
-    url("^update/(?P<pk>\d+)/$", views.TransportUpdateView.as_view(),
+    url(r"^update/(?P<pk>\d+)/$", views.TransportUpdateView.as_view(),
         name="transport_update"),
-    url("^delete/(?P<pk>\d+)/$", views.TransportDeleteView.as_view(),
+    url(r"^delete/(?P<pk>\d+)/$", views.TransportDeleteView.as_view(),
         name="transport_delete"),
 ]
diff --git a/modoboa/transport/views.py b/modoboa/transport/views.py
index 944c97a9c..91298a082 100644
--- a/modoboa/transport/views.py
+++ b/modoboa/transport/views.py
@@ -1,7 +1,7 @@
 """Transport views."""
 
 from django import http
-from django.core.urlresolvers import reverse, reverse_lazy
+from django.urls import reverse, reverse_lazy
 from django.utils.translation import ugettext as _, ugettext_lazy
 from django.views import generic
 
diff --git a/requirements.txt b/requirements.txt
index b66931b09..9e82af368 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,23 +1,23 @@
-django>=1.10,<=1.10.99
+django>=1.11.8,<=1.11.99
 django-braces==1.11.0
-django-ckeditor==5.2.1
-django-reversion==1.10.2
+django-ckeditor==5.2.2
+django-reversion==2.0.12
 django-subcommand2==0.1.1
 django-versionfield2>=0.5.0
 django-xforwardedfor-middleware
 
 dj-database-url
 
-coreapi==2.3.1
+coreapi==2.3.3
 coreapi-cli==1.0.6
-djangorestframework==3.7.1
+djangorestframework==3.7.3
 
 argparse
 # bcrypt requires libffi-dev
 bcrypt==3.1.4
 dnspython==1.15.0
 feedparser==5.2.1
-gevent==1.2.1
+gevent==1.2.2
 ipaddress
 jsonfield==2.0.2
 passlib==1.7.1
diff --git a/test_project/manage.py b/test_project/manage.py
index 7fae8c557..ba4bba75c 100755
--- a/test_project/manage.py
+++ b/test_project/manage.py
@@ -7,7 +7,19 @@ import sys
 
 if __name__ == "__main__":
     os.environ.setdefault("DJANGO_SETTINGS_MODULE", "test_project.settings")
-
-    from django.core.management import execute_from_command_line
-
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError:
+        # The above import may fail for some other reason. Ensure that the
+        # issue is really that Django is missing to avoid masking other
+        # exceptions on Python 2.
+        try:
+            import django  # noqa
+        except ImportError:
+            raise ImportError(
+                "Couldn't import Django. Are you sure it's installed and "
+                "available on your PYTHONPATH environment variable? Did you "
+                "forget to activate a virtual environment?"
+            )
+        raise
     execute_from_command_line(sys.argv)
diff --git a/test_project/test_project/__init__.py b/test_project/test_project/__init__.py
index baffc4882..e69de29bb 100644
--- a/test_project/test_project/__init__.py
+++ b/test_project/test_project/__init__.py
@@ -1 +0,0 @@
-from __future__ import unicode_literals
diff --git a/test_project/test_project/settings.py b/test_project/test_project/settings.py
index c24c7f136..3f9d0dcda 100644
--- a/test_project/test_project/settings.py
+++ b/test_project/test_project/settings.py
@@ -1,26 +1,29 @@
 """
 Django settings for test_project project.
 
+Generated by 'django-admin startproject' using Django 1.11.8.
+
 For more information on this file, see
-https://docs.djangoproject.com/en/1.6/topics/settings/
+https://docs.djangoproject.com/en/1.11/topics/settings/
 
 For the full list of settings and their values, see
-https://docs.djangoproject.com/en/1.6/ref/settings/
+https://docs.djangoproject.com/en/1.11/ref/settings/
 """
 
 from __future__ import unicode_literals
 
-# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
-import os
 from logging.handlers import SysLogHandler
+import os
 
-from modoboa.test_settings import *  # NOQA
+from modoboa.test_settings import *  # noqa
 
-BASE_DIR = os.path.dirname(os.path.dirname(__file__))
+
+# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
+BASE_DIR = os.path.realpath(os.path.dirname(os.path.dirname(__file__)))
 
 
 # Quick-start development settings - unsuitable for production
-# See https://docs.djangoproject.com/en/1.6/howto/deployment/checklist/
+# See https://docs.djangoproject.com/en/1.11/howto/deployment/checklist/
 
 # SECURITY WARNING: keep the secret key used in production secret!
 SECRET_KEY = '!8o(-dbbl3e+*bh7nx-^xysdt)1gso*%@4ze4-9_9o+i&amp;t--u_'
@@ -37,6 +40,10 @@ ALLOWED_HOSTS = [
 
 SITE_ID = 1
 
+# Security settings
+
+X_FRAME_OPTIONS = "SAMEORIGIN"
+
 # Application definition
 
 INSTALLED_APPS = (
@@ -47,8 +54,10 @@ INSTALLED_APPS = (
     'django.contrib.sites',
     'django.contrib.staticfiles',
     'reversion',
+    'ckeditor',
+    'ckeditor_uploader',
     'rest_framework',
-    'rest_framework.authtoken'
+    'rest_framework.authtoken',
 )
 
 # A dedicated place to register Modoboa applications
@@ -59,17 +68,18 @@ MODOBOA_APPS = (
     'modoboa.core',
     'modoboa.lib',
     'modoboa.admin',
-    'modoboa.limits',
     'modoboa.transport',
     'modoboa.relaydomains',
+    'modoboa.limits',
     'modoboa.parameters',
+    # Modoboa extensions here.
 )
 
 INSTALLED_APPS += MODOBOA_APPS
 
 AUTH_USER_MODEL = 'core.User'
 
-MIDDLEWARE_CLASSES = (
+MIDDLEWARE = (
     'x_forwarded_for.middleware.XForwardedForMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
@@ -85,10 +95,88 @@ MIDDLEWARE_CLASSES = (
 )
 
 AUTHENTICATION_BACKENDS = (
+    # 'modoboa.lib.authbackends.LDAPBackend',
+    # 'modoboa.lib.authbackends.SMTPBackend',
     'django.contrib.auth.backends.ModelBackend',
 )
 
-# Password validation rules
+# SMTP authentication
+# AUTH_SMTP_SERVER_ADDRESS = 'localhost'
+# AUTH_SMTP_SERVER_PORT = 25
+# AUTH_SMTP_SECURED_MODE = None  # 'ssl' or 'starttls' are accepted
+
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [],
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.template.context_processors.i18n',
+                'django.template.context_processors.media',
+                'django.template.context_processors.static',
+                'django.template.context_processors.tz',
+                'django.contrib.messages.context_processors.messages',
+                'modoboa.core.context_processors.top_notifications',
+            ],
+            'debug': TEMPLATE_DEBUG,
+        },
+    },
+]
+
+ROOT_URLCONF = 'test_project.urls'
+
+WSGI_APPLICATION = 'test_project.wsgi.application'
+
+
+# Internationalization
+# https://docs.djangoproject.com/en/1.11/topics/i18n/
+
+LANGUAGE_CODE = 'en-us'
+
+TIME_ZONE = 'UTC'
+
+USE_I18N = True
+
+USE_L10N = True
+
+USE_TZ = True
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/1.11/howto/static-files/
+
+STATIC_URL = '/sitestatic/'
+STATIC_ROOT = os.path.join(BASE_DIR, 'sitestatic')
+STATICFILES_DIRS = (
+    os.path.join(BASE_DIR, '..', 'modoboa', 'bower_components'),
+)
+
+MEDIA_URL = '/media/'
+MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
+
+# Rest framework settings
+
+REST_FRAMEWORK = {
+    'DEFAULT_AUTHENTICATION_CLASSES': (
+        'rest_framework.authentication.TokenAuthentication',
+        'rest_framework.authentication.SessionAuthentication',
+    ),
+}
+
+# Modoboa settings
+# MODOBOA_CUSTOM_LOGO = os.path.join(MEDIA_URL, "custom_logo.png")
+
+# DOVECOT_LOOKUP_PATH = ('/path/to/dovecot', )
+
+MODOBOA_API_URL = 'https://api.modoboa.org/1/'
+
+# Password validation
+# https://docs.djangoproject.com/en/1.11/ref/settings/#auth-password-validators
+
 AUTH_PASSWORD_VALIDATORS = [
     {
         'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
@@ -113,77 +201,38 @@ AUTH_PASSWORD_VALIDATORS = [
     },
 ]
 
-TEMPLATES = [
-    {
-        'BACKEND': 'django.template.backends.django.DjangoTemplates',
-        'DIRS': [],
-        'APP_DIRS': True,
-        'OPTIONS': {
-            'context_processors': [
-                'django.template.context_processors.debug',
-                'django.template.context_processors.request',
-                'django.contrib.auth.context_processors.auth',
-                'django.template.context_processors.i18n',
-                'django.template.context_processors.media',
-                'django.template.context_processors.static',
-                'django.template.context_processors.tz',
-                'django.contrib.messages.context_processors.messages',
-                'modoboa.core.context_processors.top_notifications',
-            ],
-            'debug': False,
-        },
+# CKeditor
+
+CKEDITOR_UPLOAD_PATH = "uploads/"
+
+CKEDITOR_IMAGE_BACKEND = "pillow"
+
+CKEDITOR_RESTRICT_BY_USER = True
+
+CKEDITOR_BROWSE_SHOW_DIRS = True
+
+CKEDITOR_ALLOW_NONIMAGE_FILES = False
+
+CKEDITOR_CONFIGS = {
+    'default': {
+        'allowedContent': True,
+        'toolbar': 'Modoboa',
+        'width': None,
+        'toolbar_Modoboa': [
+            ['Bold', 'Italic', 'Underline'],
+            ['JustifyLeft', 'JustifyCenter', 'JustifyRight', 'JustifyBlock'],
+            ['BidiLtr', 'BidiRtl', 'Language'],
+            ['NumberedList', 'BulletedList', '-', 'Outdent', 'Indent'],
+            ['Undo', 'Redo'],
+            ['Link', 'Unlink', 'Anchor', '-', 'Smiley'],
+            ['TextColor', 'BGColor', '-', 'Source'],
+            ['Font', 'FontSize'],
+            ['Image', ],
+            ['SpellChecker']
+        ],
     },
-]
-
-ROOT_URLCONF = 'test_project.urls'
-
-WSGI_APPLICATION = 'test_project.wsgi.application'
-
-
-# Internationalization
-# https://docs.djangoproject.com/en/1.6/topics/i18n/
-
-LANGUAGE_CODE = 'en-us'
-
-TIME_ZONE = 'UTC'
-
-USE_I18N = True
-
-USE_L10N = False
-
-USE_TZ = True
-
-# Static files (CSS, JavaScript, Images)
-# https://docs.djangoproject.com/en/1.6/howto/static-files/
-
-STATIC_URL = '/sitestatic/'
-STATIC_ROOT = os.path.join(BASE_DIR, 'sitestatic')
-STATICFILES_DIRS = (
-    os.path.join(BASE_DIR, '..', 'modoboa', 'bower_components'),
-)
-
-MEDIA_URL = '/media/'
-MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
-
-# Rest framework settings
-
-REST_FRAMEWORK = {
-    'DEFAULT_AUTHENTICATION_CLASSES': (
-        'rest_framework.authentication.TokenAuthentication',
-        'rest_framework.authentication.SessionAuthentication',
-    ),
-    'DEFAULT_PERMISSION_CLASSES': (
-        'rest_framework.permissions.IsAuthenticated',
-    )
 }
 
-# Modoboa settings
-# MODOBOA_CUSTOM_LOGO = os.path.join(MEDIA_URL, "custom_logo.png")
-
-# DOVECOT_LOOKUP_PATH = ('/path/to/dovecot', )
-
-MODOBOA_API_URL = 'http://api.modoboa.org/1/'
-
 # Logging configuration
 
 LOGGING = {
@@ -216,3 +265,5 @@ LOGGING = {
         }
     }
 }
+
+# Load settings from extensions
diff --git a/test_project/test_project/urls.py b/test_project/test_project/urls.py
index 1317f7c7b..136bd8a16 100644
--- a/test_project/test_project/urls.py
+++ b/test_project/test_project/urls.py
@@ -3,5 +3,5 @@ from __future__ import unicode_literals
 from django.conf.urls import include, url
 
 urlpatterns = [
-    url(r'', include('modoboa.urls')),
+    url(r"", include("modoboa.urls")),
 ]
diff --git a/test_project/test_project/wsgi.py b/test_project/test_project/wsgi.py
index e63b59d9e..fce40e063 100644
--- a/test_project/test_project/wsgi.py
+++ b/test_project/test_project/wsgi.py
@@ -4,13 +4,15 @@ WSGI config for test_project project.
 It exposes the WSGI callable as a module-level variable named ``application``.
 
 For more information on this file, see
-https://docs.djangoproject.com/en/1.7/howto/deployment/wsgi/
+https://docs.djangoproject.com/en/1.11/howto/deployment/wsgi/
 """
 
 from __future__ import unicode_literals
 
 import os
-os.environ.setdefault("DJANGO_SETTINGS_MODULE", "test_project.settings")
 
 from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "test_project.settings")
+
 application = get_wsgi_application()