diff --git a/modoboa/core/app_settings.py b/modoboa/core/app_settings.py
index d4c04f7e0..63c009777 100644
--- a/modoboa/core/app_settings.py
+++ b/modoboa/core/app_settings.py
@@ -2,9 +2,10 @@
 from django import forms
 from django.conf import settings
 from django.utils.translation import ugettext as _, ugettext_lazy
-from modoboa.lib.form_utils import YesNoField, SeparatorField, InlineRadioSelect
-from modoboa.lib.cryptutils import random_key
+
 from modoboa.lib import parameters
+from modoboa.lib.cryptutils import random_key
+from modoboa.lib.form_utils import YesNoField, SeparatorField, InlineRadioSelect
 
 
 def enabled_applications():
@@ -304,8 +305,9 @@ class GeneralParametersForm(parameters.AdminParametersForm):
             required_fields = ["ldap_user_dn_template"]
 
         for f in required_fields:
-            if not f in cleaned_data or cleaned_data[f] == u'':
-                self._errors[f] = self.error_class([_("This field is required")])
+            if f not in cleaned_data or cleaned_data[f] == u'':
+                self._errors[f] = self.error_class(
+                    [_("This field is required")])
 
         return cleaned_data
 
@@ -341,14 +343,20 @@ class GeneralParametersForm(parameters.AdminParametersForm):
         ))
         if values["ldap_auth_method"] == "searchbind":
             setattr(settings, "AUTH_LDAP_BIND_DN", values["ldap_bind_dn"])
-            setattr(settings, "AUTH_LDAP_BIND_PASSWORD", values["ldap_bind_password"])
+            setattr(
+                settings, "AUTH_LDAP_BIND_PASSWORD",
+                values["ldap_bind_password"]
+            )
             search = LDAPSearch(
                 values["ldap_search_base"], ldap.SCOPE_SUBTREE,
                 values["ldap_search_filter"]
             )
             setattr(settings, "AUTH_LDAP_USER_SEARCH", search)
         else:
-            setattr(settings, "AUTH_LDAP_USER_DN_TEMPLATE", values["ldap_user_dn_template"])
+            setattr(
+                settings, "AUTH_LDAP_USER_DN_TEMPLATE",
+                values["ldap_user_dn_template"]
+            )
         if values["ldap_is_active_directory"] == "yes":
             if not hasattr(settings, "AUTH_LDAP_GLOBAL_OPTIONS"):
                 setattr(settings, "AUTH_LDAP_GLOBAL_OPTIONS", {
diff --git a/modoboa/core/commands/__init__.py b/modoboa/core/commands/__init__.py
index 9b2b1c9f2..e95f987b2 100644
--- a/modoboa/core/commands/__init__.py
+++ b/modoboa/core/commands/__init__.py
@@ -1,7 +1,9 @@
 # coding: utf-8
+
+import argparse
 import os
 import sys
-import argparse
+
 from django.conf import settings
 from django.template import Context, Template
 
@@ -71,6 +73,7 @@ def scan_for_commands(dirname=""):
 
 
 def handle_command_line():
+    """Parse the command line."""
     commands = scan_for_commands()
     parser = argparse.ArgumentParser(
         description="A set of utilities to ease the installation of Modoboa.",
@@ -83,7 +86,7 @@ def handle_command_line():
                         help='A valid command name')
     (args, remaining) = parser.parse_known_args()
 
-    if not args.command in commands:
+    if args.command not in commands:
         print >> sys.stderr, "Unknown command '%s'" % args.command
         sys.exit(1)
 
diff --git a/modoboa/core/commands/help.py b/modoboa/core/commands/help.py
index dfe46307c..ab6960d00 100644
--- a/modoboa/core/commands/help.py
+++ b/modoboa/core/commands/help.py
@@ -1,9 +1,12 @@
 # coding: utf-8
+
 import sys
+
 from . import Command
 
 
 class HelpCommand(Command):
+
     help = "Display the help message associated to a specific command"
 
     def __init__(self, *args, **kwargs):
@@ -12,7 +15,7 @@ class HelpCommand(Command):
                                   help='A command name')
 
     def handle(self, parsed_args):
-        if not parsed_args.name in self._commands:
+        if parsed_args.name not in self._commands:
             print >>sys.stderr, "Unknown command: %s" % parsed_args.name
             sys.exit(1)
         cmd = self._commands[parsed_args.name](self._commands)
diff --git a/modoboa/core/extensions.py b/modoboa/core/extensions.py
index 03997c150..99a89f7a3 100644
--- a/modoboa/core/extensions.py
+++ b/modoboa/core/extensions.py
@@ -1,3 +1,5 @@
+"""Extension management."""
+
 from django.conf import settings
 from django.conf.urls import include
 
@@ -44,9 +46,9 @@ class ExtensionsPool(object):
         self.extensions[ext.name] = dict(cls=ext, show=show)
 
     def get_extension(self, name):
-        if not name in self.extensions:
+        if name not in self.extensions:
             return None
-        if not "instance" in self.extensions[name]:
+        if "instance" not in self.extensions[name]:
             self.extensions[name]["instance"] = self.extensions[name]["cls"]()
         return self.extensions[name]["instance"]
 
@@ -54,7 +56,7 @@ class ExtensionsPool(object):
         """Check if an extension is enabled or not."""
         from modoboa.core.models import Extension
 
-        if not name in self.extensions:
+        if name not in self.extensions:
             return False
         try:
             state = Extension.objects.get(name=name).enabled
diff --git a/modoboa/core/forms.py b/modoboa/core/forms.py
index 12c361797..a72f13d44 100644
--- a/modoboa/core/forms.py
+++ b/modoboa/core/forms.py
@@ -1,6 +1,10 @@
 # coding: utf-8
+
+"""Core forms."""
+
 from django import forms
 from django.utils.translation import ugettext as _, ugettext_lazy
+
 from modoboa.core.models import User
 from modoboa.lib import parameters
 
@@ -38,9 +42,9 @@ class ProfileForm(forms.ModelForm):
         model = User
         fields = ("first_name", "last_name")
         widgets = {
-                    'first_name': forms.TextInput(attrs={'class': 'form-control'}),
-                    'last_name': forms.TextInput(attrs={'class': 'form-control'})
-                 }
+            'first_name': forms.TextInput(attrs={'class': 'form-control'}),
+            'last_name': forms.TextInput(attrs={'class': 'form-control'})
+        }
 
     def __init__(self, update_password, *args, **kwargs):
         super(ProfileForm, self).__init__(*args, **kwargs)
@@ -61,15 +65,19 @@ class ProfileForm(forms.ModelForm):
         return self.cleaned_data["oldpassword"]
 
     def clean_confirmation(self):
-        if self.cleaned_data["newpassword"] != self.cleaned_data["confirmation"]:
+        newpassword = self.cleaned_data["newpassword"]
+        confirmation = self.cleaned_data["confirmation"]
+        if newpassword != confirmation:
             raise forms.ValidationError(_("Passwords mismatch"))
         return self.cleaned_data["confirmation"]
 
     def save(self, commit=True):
         user = super(ProfileForm, self).save(commit=False)
         if commit:
-            if self.cleaned_data.has_key("confirmation") and \
-                    self.cleaned_data["confirmation"] != "":
-                user.set_password(self.cleaned_data["confirmation"], self.cleaned_data["oldpassword"])
+            if self.cleaned_data.get("confirmation", "") != "":
+                user.set_password(
+                    self.cleaned_data["confirmation"],
+                    self.cleaned_data["oldpassword"]
+                )
             user.save()
         return user
diff --git a/modoboa/core/management/commands/clean_unknown_extensions.py b/modoboa/core/management/commands/clean_unknown_extensions.py
index f22c13852..d0a297fea 100644
--- a/modoboa/core/management/commands/clean_unknown_extensions.py
+++ b/modoboa/core/management/commands/clean_unknown_extensions.py
@@ -21,6 +21,6 @@ class Command(BaseCommand):
         """Entry point."""
         for extension in Extension.objects.all():
             fullname = "modoboa.extensions.{0}".format(extension.name)
-            if not fullname in settings.MODOBOA_APPS:
+            if fullname not in settings.MODOBOA_APPS:
                 extension.delete()
         connection.close()
diff --git a/modoboa/core/management/commands/manage_extensions.py b/modoboa/core/management/commands/manage_extensions.py
index 24133a1e0..af90b1302 100644
--- a/modoboa/core/management/commands/manage_extensions.py
+++ b/modoboa/core/management/commands/manage_extensions.py
@@ -53,6 +53,6 @@ class Command(BaseCommand, CloseConnectionMixin):
 
         for extname in args:
             fullname = "modoboa.extensions.{0}".format(extname)
-            if not fullname in settings.MODOBOA_APPS:
+            if fullname not in settings.MODOBOA_APPS:
                 continue
             self._change_extension_state(extname, options)
diff --git a/modoboa/core/models.py b/modoboa/core/models.py
index 29f3be872..93f32451f 100644
--- a/modoboa/core/models.py
+++ b/modoboa/core/models.py
@@ -1,27 +1,33 @@
-import sys
+"""Core models."""
+
+import logging
 import os
 import re
-import logging
-import reversion
-from django.db import models
-from django.db.models.signals import post_delete
+import sys
+
 from django.conf import settings
-from django.dispatch import receiver
-from django.utils import timezone
-from django.utils.translation import ugettext as _, ugettext_lazy
-from django.contrib.contenttypes.models import ContentType
-from django.contrib.contenttypes import generic
+from django.contrib.auth.hashers import make_password, is_password_usable
 from django.contrib.auth.models import (
     UserManager, Group, PermissionsMixin
 )
-from django.contrib.auth.hashers import make_password, is_password_usable
+from django.contrib.contenttypes import generic
+from django.contrib.contenttypes.models import ContentType
+from django.db import models
+from django.db.models.signals import post_delete
+from django.dispatch import receiver
+from django.utils import timezone
+from django.utils.translation import ugettext as _, ugettext_lazy
+
+import reversion
+
+from modoboa.core.extensions import exts_pool
+from modoboa.core.password_hashers import get_password_hasher
 from modoboa.lib import events, parameters
 from modoboa.lib.exceptions import (
     PermDeniedException, InternalError, BadRequest, Conflict
 )
 from modoboa.lib.sysutils import exec_cmd
-from modoboa.core.extensions import exts_pool
-from modoboa.core.password_hashers import get_password_hasher
+
 
 try:
     from modoboa.lib.ldap_utils import LDAPAuthBackend
@@ -242,7 +248,8 @@ class User(PermissionsMixin):
         """
         ct = ContentType.objects.get_for_model(obj)
         try:
-            ooentry = self.objectaccess_set.get(content_type=ct, object_id=obj.id)
+            ooentry = self.objectaccess_set.get(
+                content_type=ct, object_id=obj.id)
         except ObjectAccess.DoesNotExist:
             return False
         return ooentry.is_owner
@@ -263,7 +270,8 @@ class User(PermissionsMixin):
 
         ct = ContentType.objects.get_for_model(obj)
         try:
-            ooentry = self.objectaccess_set.get(content_type=ct, object_id=obj.id)
+            ooentry = self.objectaccess_set.get(
+                content_type=ct, object_id=obj.id)
         except ObjectAccess.DoesNotExist:
             pass
         else:
@@ -333,7 +341,8 @@ class User(PermissionsMixin):
         if len(row) < 7:
             raise BadRequest(_("Invalid line"))
         role = row[6].strip()
-        if not user.is_superuser and not role in ["SimpleUsers", "DomainAdmins"]:
+        allowed_roles = ["SimpleUsers", "DomainAdmins"]
+        if not user.is_superuser and role not in allowed_roles:
             raise PermDeniedException(
                 _("You can't import an account with a role greater than yours")
             )
@@ -345,13 +354,15 @@ class User(PermissionsMixin):
         else:
             raise Conflict
         if role == "SimpleUsers":
-            if (len(row) < 8 or not row[7].strip()):
+            if len(row) < 8 or not row[7].strip():
                 raise BadRequest(
-                    _("The simple user '%s' must have a valid email address" % self.username)
+                    _("The simple user '%s' must have a valid email address"
+                      % self.username)
                 )
             if self.username != row[7].strip():
                 raise BadRequest(
-                    _("username and email fields must not differ for '%s'" % self.username)
+                    _("username and email fields must not differ for '%s'"
+                      % self.username)
                 )
 
         if crypt_password:
@@ -374,9 +385,16 @@ class User(PermissionsMixin):
 
         :param csvwriter: csv object
         """
-        row = ["account", self.username.encode("utf-8"), self.password.encode("utf-8"),
-               self.first_name.encode("utf-8"), self.last_name.encode("utf-8"),
-               self.is_active, self.group, self.email.encode("utf-8")]
+        row = [
+            "account",
+            self.username.encode("utf-8"),
+            self.password.encode("utf-8"),
+            self.first_name.encode("utf-8"),
+            self.last_name.encode("utf-8"),
+            self.is_active,
+            self.group,
+            self.email.encode("utf-8")
+        ]
         row += events.raiseQueryEvent("AccountExported", self)
         csvwriter.writerow(row)
 
@@ -414,7 +432,9 @@ class ObjectAccess(models.Model):
         unique_together = (("user", "content_type", "object_id"),)
 
     def __unicode__(self):
-        return "%s => %s (%s)" % (self.user, self.content_object, self.content_type)
+        return "%s => %s (%s)" % (
+            self.user, self.content_object, self.content_type
+        )
 
 
 class Extension(models.Model):
@@ -501,7 +521,7 @@ def post_revision_commit(sender, **kwargs):
     """
     from modoboa.lib.signals import get_request
 
-    current_user = get_request().user.username 
+    current_user = get_request().user.username
     logger = logging.getLogger("modoboa.admin")
     for version in kwargs["versions"]:
         if version.object is None:
diff --git a/modoboa/core/templatetags/core_tags.py b/modoboa/core/templatetags/core_tags.py
index 9cbed9c08..9c9830c33 100644
--- a/modoboa/core/templatetags/core_tags.py
+++ b/modoboa/core/templatetags/core_tags.py
@@ -1,10 +1,14 @@
+"""Custom tags for Core application."""
+
 import re
+
 from django import template
+from django.contrib.sessions.models import Session
+from django.core.urlresolvers import reverse
 from django.template.loader import render_to_string
 from django.utils import timezone
 from django.utils.translation import ugettext as _
-from django.core.urlresolvers import reverse
-from django.contrib.sessions.models import Session
+
 from modoboa.lib import events
 
 
@@ -125,7 +129,7 @@ def colorize_level(level):
         "WARNING": "text-warning",
         "CRITICAL": "text-danger"
     }
-    if not level in classes:
+    if level not in classes:
         return level
     return "<p class='%s'>%s</p>" % (classes[level], level)
 
@@ -140,7 +144,7 @@ def tohtml(message):
 def visirule(field):
     if not hasattr(field, 'form') or \
             not hasattr(field.form, "visirules") or \
-            not field.html_name in field.form.visirules:
+            field.html_name not in field.form.visirules:
         return ""
     rule = field.form.visirules[field.html_name]
     return " data-visibility-field='%s' data-visibility-value='%s' " \
diff --git a/modoboa/core/tests.py b/modoboa/core/tests.py
index 56ed41f2e..8c3608dae 100644
--- a/modoboa/core/tests.py
+++ b/modoboa/core/tests.py
@@ -74,7 +74,8 @@ class ModoboaAdminCommandTestCase(TestCase):
             categories = ["std", "autoreply", "relaydomains"]
         dburl = "{0}://user:password@localhost/testdb".format(engine)
         code, output = exec_cmd(
-            "modoboa-admin.py postfix_maps --categories {0} --dburl {1} {2}".format(
+            "modoboa-admin.py postfix_maps --categories {0}"
+            " --dburl {1} {2}".format(
                 " ".join(categories), dburl, self.workdir
             )
         )
diff --git a/modoboa/core/views/admin.py b/modoboa/core/views/admin.py
index a81af1880..b4b36e056 100644
--- a/modoboa/core/views/admin.py
+++ b/modoboa/core/views/admin.py
@@ -1,15 +1,12 @@
 """
 Views available to super administrators only.
 """
-
-from django.shortcuts import render
-from django.template.loader import render_to_string
-from django.utils.translation import ugettext as _
-
 from django.contrib.auth.decorators import (
     login_required, user_passes_test
 )
-
+from django.shortcuts import render
+from django.template.loader import render_to_string
+from django.utils.translation import ugettext as _
 
 from modoboa.core.models import Extension, Log
 from modoboa.core.utils import new_version_available
@@ -88,12 +85,12 @@ def saveextensions(request):
         if k.startswith("select_"):
             parts = k.split("_", 1)
             dbext = Extension.objects.get(name=parts[1])
-            if not dbext in actived_exts:
+            if dbext not in actived_exts:
                 dbext.on()
             else:
                 found += [dbext]
     for ext in actived_exts:
-        if not ext in found:
+        if ext not in found:
             ext.off()
 
     return render_to_json_response(_("Modifications applied."))
diff --git a/modoboa/core/views/auth.py b/modoboa/core/views/auth.py
index d46ef3ea2..44325a366 100644
--- a/modoboa/core/views/auth.py
+++ b/modoboa/core/views/auth.py
@@ -1,16 +1,19 @@
 # coding: utf-8
 import logging
-from django.views.decorators.cache import never_cache
+
 from django.contrib.auth import authenticate, login, logout
-from django.http import HttpResponse, HttpResponseRedirect
 from django.core.urlresolvers import reverse
+from django.http import HttpResponse, HttpResponseRedirect
 from django.utils.translation import ugettext as _
+from django.views.decorators.cache import never_cache
+
+from modoboa.core.forms import LoginForm
 from modoboa.lib import events, parameters
 from modoboa.lib.web_utils import _render_to_string
-from modoboa.core.forms import LoginForm
 
 
 def dologin(request):
+    """Try to authenticate."""
     error = None
     if request.method == "POST":
         form = LoginForm(request.POST)
@@ -43,7 +46,7 @@ def dologin(request):
             error = _(
                 "Your username and password didn't match. Please try again.")
             logger.warning(
-                "Failed connection attempt from '%(addr)s' as user '%(user)s'" \
+                "Failed connection attempt from '%(addr)s' as user '%(user)s'"
                 % {"addr": request.META["REMOTE_ADDR"],
                    "user": form.cleaned_data["username"]}
             )
diff --git a/modoboa/core/views/user.py b/modoboa/core/views/user.py
index 3cc2ec53d..7c444bbd6 100644
--- a/modoboa/core/views/user.py
+++ b/modoboa/core/views/user.py
@@ -1,12 +1,15 @@
+"""Simple user views."""
+
+from django.contrib.auth.decorators import login_required
 from django.shortcuts import render
 from django.utils.translation import ugettext as _
-from django.contrib.auth.decorators import login_required
+
+from modoboa.core.forms import ProfileForm
 from modoboa.lib import events, parameters
+from modoboa.lib.cryptutils import encrypt
 from modoboa.lib.web_utils import (
     _render_to_string, render_to_json_response
 )
-from modoboa.lib.cryptutils import encrypt
-from modoboa.core.forms import ProfileForm
 
 
 @login_required
@@ -31,7 +34,8 @@ def profile(request, tplname='core/user_profile.html'):
         if form.is_valid():
             form.save()
             if update_password and form.cleaned_data["confirmation"] != "":
-                request.session["password"] = encrypt(form.cleaned_data["confirmation"])
+                request.session["password"] = encrypt(
+                    form.cleaned_data["confirmation"])
             return render_to_json_response(_("Profile updated"))
         return render_to_json_response({'form_errors': form.errors}, status=400)
 
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 000000000..a7854adaf
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,3 @@
+[pep8]
+max-line-length = 80
+exclude = migrations