diff --git a/modoboa/core/app_settings.py b/modoboa/core/app_settings.py
index f361d4a7d..9acfafae5 100644
--- a/modoboa/core/app_settings.py
+++ b/modoboa/core/app_settings.py
@@ -3,7 +3,6 @@ from django import forms
 from django.conf import settings
 from django.utils.translation import ugettext as _, ugettext_lazy
 from modoboa.lib.formutils import YesNoField, SeparatorField, InlineRadioSelect
-from modoboa.lib.sysutils import exec_cmd
 from modoboa.lib.cryptutils import random_key
 from modoboa.lib import parameters
 
@@ -202,7 +201,7 @@ class GeneralParametersForm(parameters.AdminParametersForm):
             required_fields = ["ldap_search_base", "ldap_search_filter"]
         else:
             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")])
@@ -214,7 +213,6 @@ class GeneralParametersForm(parameters.AdminParametersForm):
 
         Doing so, we can use the django_auth_ldap module.
         """
-        from django.conf import settings
         try:
             import ldap
             from django_auth_ldap.config import LDAPSearch
@@ -268,9 +266,9 @@ class UserSettings(parameters.UserParametersForm):
     lang = forms.ChoiceField(
         initial=translate_language_code(settings.LANGUAGE_CODE),
         label=ugettext_lazy("Prefered language"),
-        choices=[("cs", "čeština"), ("de", "deutsch"), 
+        choices=[("cs", "čeština"), ("de", "deutsch"),
                  ("en", "english"), ("es", "español"),
                  ("fr", "français"), ("it", "italiano"),
-                 ("pt", "português"), ("sv", "svenska"),],
+                 ("pt", "português"), ("sv", "svenska")],
         help_text=ugettext_lazy("Prefered language to display pages")
     )
diff --git a/modoboa/core/extensions.py b/modoboa/core/extensions.py
index 2b7f91772..4b399bd24 100644
--- a/modoboa/core/extensions.py
+++ b/modoboa/core/extensions.py
@@ -1,6 +1,3 @@
-import os
-import sys
-import re
 from django.conf import settings
 from django.conf.urls import include
 
diff --git a/modoboa/core/models.py b/modoboa/core/models.py
index 6d51a3aac..987b706b7 100644
--- a/modoboa/core/models.py
+++ b/modoboa/core/models.py
@@ -6,7 +6,6 @@ import base64
 from random import Random
 import reversion
 from django.db import models
-from django.db.models import Q
 from django.dispatch import receiver
 from django.utils import timezone
 from django.utils.translation import ugettext as _, ugettext_lazy
@@ -16,7 +15,6 @@ from django.contrib.contenttypes import generic
 from django.contrib.auth.models import (
     UserManager, Group, AbstractBaseUser, PermissionsMixin
 )
-from django.contrib.contenttypes.models import ContentType
 from modoboa.lib import events, md5crypt, parameters
 from modoboa.lib.exceptions import PermDeniedException
 from modoboa.lib.sysutils import exec_cmd
@@ -172,7 +170,8 @@ class User(AbstractBaseUser, PermissionsMixin):
     @property
     def tags(self):
         return [{"name": "account", "label": _("account"), "type": "idt"},
-                {"name": self.group, "label": self.group, "type": "grp", "color": "info"}]
+                {"name": self.group, "label": self.group,
+                 "type": "grp", "color": "info"}]
 
     @property
     def fullname(self):
@@ -313,7 +312,7 @@ class User(AbstractBaseUser, PermissionsMixin):
 
         "account", loginname, password, first name, last name, enabled, group, address[, domain, ...]
 
-        :param user: 
+        :param user: a ``core.User`` instance
         :param row: a list containing the expected information
         :param crypt_password:
         """
diff --git a/modoboa/core/tables.py b/modoboa/core/tables.py
index 9e1d79a53..e35868cab 100644
--- a/modoboa/core/tables.py
+++ b/modoboa/core/tables.py
@@ -1,4 +1,4 @@
-from django.utils.translation import ugettext as _, ugettext_lazy
+from django.utils.translation import ugettext_lazy
 from modoboa.lib import tables
 
 
@@ -6,7 +6,9 @@ class ExtensionsTable(tables.Table):
     idkey = "id"
     selection = tables.SelectionColumn("selection", width="4%", header=False)
     label = tables.Column("label", label=ugettext_lazy("Name"), width="15%")
-    version = tables.Column("version", label=ugettext_lazy("Version"), width="6%")
+    version = tables.Column(
+        "version", label=ugettext_lazy("Version"), width="6%"
+    )
     descr = tables.Column("description", label=ugettext_lazy("Description"))
-    
+
     cols_order = ["selection", "label", "version", "descr"]
diff --git a/modoboa/core/urls.py b/modoboa/core/urls.py
index 152d56229..c677f73c4 100644
--- a/modoboa/core/urls.py
+++ b/modoboa/core/urls.py
@@ -1,4 +1,4 @@
-from django.conf.urls import patterns, url
+from django.conf.urls import patterns
 
 
 urlpatterns = patterns(
diff --git a/modoboa/core/views/user.py b/modoboa/core/views/user.py
index 3a9b077d0..c42054526 100644
--- a/modoboa/core/views/user.py
+++ b/modoboa/core/views/user.py
@@ -1,6 +1,6 @@
 from django.shortcuts import render
 from django.utils.translation import ugettext as _
-from django.contrib.auth.decorators import login_required, user_passes_test
+from django.contrib.auth.decorators import login_required
 from modoboa.lib import events, parameters
 from modoboa.lib.webutils import (
     ajax_simple_response, _render_to_string
diff --git a/modoboa/demo/__init__.py b/modoboa/demo/__init__.py
index 69ccfecc5..76f5c05b4 100755
--- a/modoboa/demo/__init__.py
+++ b/modoboa/demo/__init__.py
@@ -1,5 +1,4 @@
 # coding: utf-8
-from django.conf import settings
 from django.core.urlresolvers import reverse
 from django.utils.translation import ugettext_lazy as _
 from django.template.loader import render_to_string
diff --git a/modoboa/extensions/admin/app_settings.py b/modoboa/extensions/admin/app_settings.py
index c5fed0767..0ab9f3106 100644
--- a/modoboa/extensions/admin/app_settings.py
+++ b/modoboa/extensions/admin/app_settings.py
@@ -1,6 +1,6 @@
 from django import forms
 from django.utils.translation import ugettext_lazy
-from modoboa.lib.formutils import YesNoField, SeparatorField, InlineRadioSelect
+from modoboa.lib.formutils import YesNoField, SeparatorField
 from modoboa.lib.sysutils import exec_cmd
 from modoboa.lib import parameters
 
diff --git a/modoboa/extensions/admin/factories.py b/modoboa/extensions/admin/factories.py
index fb41dd231..b050ff23d 100644
--- a/modoboa/extensions/admin/factories.py
+++ b/modoboa/extensions/admin/factories.py
@@ -1,5 +1,4 @@
 import factory
-from django.contrib.auth.models import Group
 from . import models
 
 
diff --git a/modoboa/extensions/admin/forms.py b/modoboa/extensions/admin/forms.py
index 7a12ffe98..74fea705c 100644
--- a/modoboa/extensions/admin/forms.py
+++ b/modoboa/extensions/admin/forms.py
@@ -1,6 +1,5 @@
 # coding: utf-8
 from django import forms
-from django.contrib.auth.models import Group
 from django.utils.translation import ugettext as _, ugettext_lazy
 from django.http import QueryDict
 from modoboa.lib import events, parameters
@@ -10,9 +9,7 @@ from modoboa.lib.permissions import get_account_roles
 from modoboa.lib.formutils import (
     DomainNameField, YesNoField, DynamicForm, TabForms
 )
-from modoboa.lib.exceptions import PermDeniedException
 from modoboa.core.models import User
-from modoboa.extensions.admin.templatetags.admin_tags import gender
 from modoboa.extensions.admin.exceptions import AdminError, BadDestination
 from modoboa.extensions.admin.models import (
     Domain, DomainAlias, Mailbox, Alias, Quota
@@ -547,7 +544,7 @@ class AccountFormMail(forms.Form, DynamicForm):
             if not user.can_access(domain):
                 raise PermDeniedException
             try:
-                mb = Mailbox.objects.get(address=locpart, domain=domain)
+                Mailbox.objects.get(address=locpart, domain=domain)
             except Mailbox.DoesNotExist:
                 pass
             else:
@@ -725,7 +722,7 @@ class ForwardForm(forms.Form):
             if not local_part or not domname or not len(domname):
                 raise BadDestination("Invalid mailbox syntax for %s" % d)
             try:
-                mb = Domain.objects.get(name=domname)
+                Domain.objects.get(name=domname)
             except Domain.DoesNotExist:
                 self.dests += [d]
             else:
diff --git a/modoboa/extensions/admin/models/domain.py b/modoboa/extensions/admin/models/domain.py
index 2c5fe1ff2..c4d7d5a36 100644
--- a/modoboa/extensions/admin/models/domain.py
+++ b/modoboa/extensions/admin/models/domain.py
@@ -4,7 +4,7 @@ from django.db.models.manager import Manager
 from django.utils.translation import ugettext as _, ugettext_lazy
 from django.contrib.contenttypes import generic
 from modoboa.lib import events, parameters
-from modoboa.core.models import ObjectAccess
+from modoboa.core.models import User, ObjectAccess
 from modoboa.extensions.admin.exceptions import AdminError
 from .base import DatesAware
 
diff --git a/modoboa/extensions/admin/templatetags/admin_tags.py b/modoboa/extensions/admin/templatetags/admin_tags.py
index 16010ef81..9d23eee01 100644
--- a/modoboa/extensions/admin/templatetags/admin_tags.py
+++ b/modoboa/extensions/admin/templatetags/admin_tags.py
@@ -1,10 +1,9 @@
-import re
 from django import template
 from django.template.loader import render_to_string
 from django.utils.translation import ugettext as _, ugettext_lazy
 from django.core.urlresolvers import reverse
 from modoboa.lib import events
-from modoboa.lib.webutils import static_url, render_actions
+from modoboa.lib.webutils import render_actions
 from modoboa.lib.templatetags.lib_tags import render_link
 
 register = template.Library()
diff --git a/modoboa/extensions/admin/tests.py b/modoboa/extensions/admin/tests.py
index d32ad74f1..9d2192189 100644
--- a/modoboa/extensions/admin/tests.py
+++ b/modoboa/extensions/admin/tests.py
@@ -12,10 +12,11 @@ TODO:
 from django.core.urlresolvers import reverse
 from django.core.files.base import ContentFile
 from modoboa.core.models import User
-from modoboa.core.factories import UserFactory, GroupFactory
+from modoboa.core.factories import UserFactory
 from modoboa.lib.tests import ModoTestCase
-from modoboa.extensions.admin.lib import *
-from modoboa.extensions.admin.models import *
+from modoboa.extensions.admin.models import (
+    Domain, Mailbox, Alias, DomainAlias
+)
 from . import factories
 
 
diff --git a/modoboa/extensions/admin/views/alias.py b/modoboa/extensions/admin/views/alias.py
index 7ffb9c991..b03c32fd3 100644
--- a/modoboa/extensions/admin/views/alias.py
+++ b/modoboa/extensions/admin/views/alias.py
@@ -3,7 +3,7 @@ from django.utils.translation import ugettext as _, ungettext
 from django.shortcuts import render
 from django.core.urlresolvers import reverse
 from django.contrib.auth.decorators import (
-    login_required, permission_required, user_passes_test
+    login_required, permission_required
 )
 from modoboa.lib import events
 from modoboa.lib.webutils import ajax_response, ajax_simple_response
diff --git a/modoboa/extensions/admin/views/domain.py b/modoboa/extensions/admin/views/domain.py
index bedeb89fb..91f2c1669 100644
--- a/modoboa/extensions/admin/views/domain.py
+++ b/modoboa/extensions/admin/views/domain.py
@@ -1,4 +1,4 @@
-from django.http import HttpResponse, HttpResponseRedirect
+from django.http import HttpResponseRedirect
 from django.utils.translation import ugettext as _, ungettext
 from django.core.urlresolvers import reverse
 from django.db import transaction
@@ -10,7 +10,7 @@ from django.contrib.auth.decorators import (
 )
 from modoboa.lib import parameters, events
 from modoboa.lib.webutils import (
-    ajax_simple_response, ajax_response, _render_to_string
+    ajax_simple_response, _render_to_string
 )
 from modoboa.lib.formutils import CreationWizard
 from modoboa.lib.exceptions import PermDeniedException
@@ -59,7 +59,9 @@ def _domains(request):
 def domains(request, tplname="admin/domains.html"):
     if not request.user.has_perm("admin.view_domains"):
         if request.user.has_perm("admin.view_mailboxes"):
-            return HttpResponseRedirect(reverse(identities))
+            return HttpResponseRedirect(
+                reverse('modoboa.extensions.admin.views.identity.identities')
+            )
         return HttpResponseRedirect(reverse("modoboa.core.views.user.index"))
     return render(request, tplname, {"selection": "domains"})
 
diff --git a/modoboa/extensions/admin/views/export.py b/modoboa/extensions/admin/views/export.py
index 58c2928f3..c6e9dade2 100644
--- a/modoboa/extensions/admin/views/export.py
+++ b/modoboa/extensions/admin/views/export.py
@@ -4,8 +4,7 @@ from rfc6266 import build_header
 from django.http import HttpResponse
 from django.shortcuts import render
 from django.core.urlresolvers import reverse
-from django.db import transaction
-from django.utils.translation import ugettext as _, ungettext
+from django.utils.translation import ugettext as _
 from django.contrib.auth.decorators import (
     login_required, permission_required, user_passes_test
 )
diff --git a/modoboa/extensions/admin/views/identity.py b/modoboa/extensions/admin/views/identity.py
index 4f67990be..8ba173707 100644
--- a/modoboa/extensions/admin/views/identity.py
+++ b/modoboa/extensions/admin/views/identity.py
@@ -8,11 +8,13 @@ from django.contrib.auth.decorators import (
 from django.views.decorators.csrf import ensure_csrf_cookie
 from modoboa.lib import parameters, events
 from modoboa.lib.exceptions import PermDeniedException
-from modoboa.lib.webutils import ajax_simple_response, _render_to_string
+from modoboa.lib.webutils import (
+    ajax_simple_response, _render_to_string, ajax_response
+)
 from modoboa.lib.formutils import CreationWizard
 from modoboa.lib.templatetags.lib_tags import pagination_bar
 from modoboa.core.models import User
-from modoboa.extensions.admin.models import Mailbox
+from modoboa.extensions.admin.models import Mailbox, Domain
 from modoboa.extensions.admin.lib import (
     get_sort_order, get_listing_page, get_identities
 )
diff --git a/modoboa/extensions/admin/views/import.py b/modoboa/extensions/admin/views/import.py
index c1c732aa7..5384d682a 100644
--- a/modoboa/extensions/admin/views/import.py
+++ b/modoboa/extensions/admin/views/import.py
@@ -1,5 +1,5 @@
 import csv
-from django.utils.translation import ugettext as _, ungettext
+from django.utils.translation import ugettext as _
 from django.shortcuts import render
 from django.core.urlresolvers import reverse
 from django.db import transaction, IntegrityError
diff --git a/modoboa/extensions/admin/views/user.py b/modoboa/extensions/admin/views/user.py
index ad799dc17..2c4ef4b6a 100644
--- a/modoboa/extensions/admin/views/user.py
+++ b/modoboa/extensions/admin/views/user.py
@@ -55,7 +55,7 @@ def forward(request, tplname='admin/forward.html'):
     if al is not None:
         form.fields["dest"].initial = al.extmboxes
         try:
-            selfmb = al.mboxes.get(pk=mb.id)
+            al.mboxes.get(pk=mb.id)
         except Mailbox.DoesNotExist:
             pass
         else:
diff --git a/modoboa/extensions/amavis/__init__.py b/modoboa/extensions/amavis/__init__.py
index 9a8bc1b15..9abc912ed 100644
--- a/modoboa/extensions/amavis/__init__.py
+++ b/modoboa/extensions/amavis/__init__.py
@@ -33,7 +33,7 @@ class Amavis(ModoExtension):
 
         for dom in Domain.objects.all():
             try:
-                u = Users.objects.get(email="@%s" % dom.name)
+                Users.objects.get(email="@%s" % dom.name)
             except Users.DoesNotExist:
                 p = Policy.objects.create(policy_name=dom.name)
                 Users.objects.create(email="@%s" % dom.name, fullname=dom.name,
diff --git a/modoboa/extensions/amavis/forms.py b/modoboa/extensions/amavis/forms.py
index f655418e3..721b3c5a1 100644
--- a/modoboa/extensions/amavis/forms.py
+++ b/modoboa/extensions/amavis/forms.py
@@ -1,5 +1,4 @@
 # coding: utf-8
-from django.utils.translation import ugettext_lazy as _
 from django import forms
 from models import Policy, Users
 from modoboa.lib.formutils import InlineRadioSelect
@@ -20,7 +19,7 @@ class DomainPolicyForm(forms.ModelForm):
             'spam_kill_level': forms.TextInput(attrs={'class': 'span1'}),
             'spam_subject_tag2': forms.TextInput(attrs={'class': 'span2'}),
             'bypass_banned_checks': InlineRadioSelect(),
-            }
+        }
 
     def __init__(self, *args, **kwargs):
         if "instance" in kwargs:
@@ -28,7 +27,7 @@ class DomainPolicyForm(forms.ModelForm):
             try:
                 policy = Users.objects.get(email="@%s" % self.domain.name).policy
                 kwargs["instance"] = policy
-            except (Users.DoesNotExist, Policy.DoesNotExist), e:
+            except (Users.DoesNotExist, Policy.DoesNotExist):
                 del kwargs["instance"]
         super(DomainPolicyForm, self).__init__(*args, **kwargs)
         for f in self.fields.keys():
diff --git a/modoboa/extensions/amavis/lib.py b/modoboa/extensions/amavis/lib.py
index 607e93514..2a98f4ccf 100644
--- a/modoboa/extensions/amavis/lib.py
+++ b/modoboa/extensions/amavis/lib.py
@@ -6,10 +6,8 @@ import string
 from functools import wraps
 from django.core.urlresolvers import reverse
 from django.utils.translation import ugettext as _
-from django.db.models import Q
 from modoboa.lib import parameters
 from modoboa.lib.exceptions import ModoboaException
-from .models import Msgrcpt
 
 
 def selfservice(ssfunc=None):
@@ -30,7 +28,9 @@ def selfservice(ssfunc=None):
                 return f(request, *args, **kwargs)
             if parameters.get_admin("SELF_SERVICE") == "no":
                 from django.contrib.auth.views import redirect_to_login
-                return redirect_to_login(reverse("modoboa.extensions.amavis.views.index"))
+                return redirect_to_login(
+                    reverse("modoboa.extensions.amavis.views.index")
+                )
             return ssfunc(request, *args, **kwargs)
         return wrapped_f
     return decorator
@@ -50,7 +50,9 @@ class AMrelease(object):
                 self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
                 self.sock.connect(path)
         except socket.error, err:
-            raise ModoboaException(_("Connection to amavis failed: %s" % str(err)))
+            raise ModoboaException(
+                _("Connection to amavis failed: %s" % str(err))
+            )
 
     def decode(self, answer):
         def repl(match):
diff --git a/modoboa/extensions/amavis/management/commands/amnotify.py b/modoboa/extensions/amavis/management/commands/amnotify.py
index b90046869..1ede77c6e 100644
--- a/modoboa/extensions/amavis/management/commands/amnotify.py
+++ b/modoboa/extensions/amavis/management/commands/amnotify.py
@@ -1,8 +1,5 @@
 #!/usr/bin/env python
 # coding: utf-8
-
-import sys
-import os
 from optparse import make_option
 from django.core.management.base import BaseCommand, CommandError
 from django.template.loader import render_to_string
diff --git a/modoboa/extensions/amavis/models.py b/modoboa/extensions/amavis/models.py
index bda2a14ef..b15a63c93 100644
--- a/modoboa/extensions/amavis/models.py
+++ b/modoboa/extensions/amavis/models.py
@@ -10,7 +10,7 @@
 # Original Amavis version : 2.6.2
 
 from django.db import models
-from django.utils.translation import ugettext as _, ugettext_lazy
+from django.utils.translation import ugettext_lazy
 
 
 class Maddr(models.Model):
diff --git a/modoboa/extensions/amavis/sql_listing.py b/modoboa/extensions/amavis/sql_listing.py
index fb357d9be..4a40ad332 100644
--- a/modoboa/extensions/amavis/sql_listing.py
+++ b/modoboa/extensions/amavis/sql_listing.py
@@ -1,15 +1,16 @@
 # coding: utf-8
-
+import re
 from datetime import datetime
-from django.utils.translation import ugettext as _, ugettext_lazy
+from django.template.loader import render_to_string
+from django.utils.translation import ugettext_lazy
 from django.db.models import Q
 from modoboa.lib import tables
 from modoboa.lib.webutils import static_url
 from modoboa.lib.email_listing import MBconnector, EmailListing
-from modoboa.lib.emailutils import *
+from modoboa.lib.emailutils import Email
 from modoboa.lib.dbutils import db_type
 from modoboa.extensions.admin.models import Domain
-from models import *
+from .models import Quarantine, Msgrcpt
 
 
 class Qtable(tables.Table):
diff --git a/modoboa/extensions/amavis/templatetags/amavis_tags.py b/modoboa/extensions/amavis/templatetags/amavis_tags.py
index f4989034f..ab75ef7f1 100644
--- a/modoboa/extensions/amavis/templatetags/amavis_tags.py
+++ b/modoboa/extensions/amavis/templatetags/amavis_tags.py
@@ -1,112 +1,113 @@
 from django import template
 from django.template.loader import render_to_string
-from django.template import Template, Context
 from django.utils.translation import ugettext as _
 from django.core.urlresolvers import reverse
 from django.conf import settings
-from modoboa.lib.webutils import static_url
-from modoboa.extensions import amavis
 
 register = template.Library()
 
+
 @register.simple_tag
 def viewm_menu(user, mail_id, rcpt):
     entries = [
-        {"name" : "release",
-         "img" : "icon-white icon-ok",
-         "class" : "btn-success",
-         "url" : reverse(amavis.views.release, args=[mail_id])
-             + ("?rcpt=%s" % rcpt if rcpt else ""),
-         "label" : _("Release")},
-        {"name" : "delete",
-         "class" : "btn-danger",
-         "img" : "icon-white icon-trash",
-         "url" : reverse(amavis.views.delete, args=[mail_id]) \
-             + ("?rcpt=%s" % rcpt if rcpt else ""),
-         "label" : _("Delete")},
-        {"name" : "headers",
-         "url" : reverse(amavis.views.viewheaders, args=[mail_id]),
-         "label" : _("View full headers")},
-        ]
+        {"name": "release",
+         "img": "icon-white icon-ok",
+         "class": "btn-success",
+         "url": reverse('modoboa.extensions.amavis.views.release', args=[mail_id])
+         + ("?rcpt=%s" % rcpt if rcpt else ""),
+         "label": _("Release")},
+        {"name": "delete",
+         "class": "btn-danger",
+         "img": "icon-white icon-trash",
+         "url": reverse('modoboa.extensions.amavis.views.delete', args=[mail_id])
+         + ("?rcpt=%s" % rcpt if rcpt else ""),
+         "label": _("Delete")},
+        {"name": "headers",
+         "url": reverse('modoboa.extensions.amavis.views.viewheaders', args=[mail_id]),
+         "label": _("View full headers")},
+    ]
 
-    menu = render_to_string('common/buttons_list.html', 
-                            {"entries" : entries, "extraclasses" : "pull-left"})
-    
-    entries = [{"name" : "close",
-                "url" : "javascript:history.go(-1);",
-                "img" : "icon-remove"}]
-    menu += render_to_string('common/buttons_list.html', 
-                             {"entries" : entries, "extraclasses" : "pull-right"})
+    menu = render_to_string('common/buttons_list.html',
+                            {"entries": entries, "extraclasses": "pull-left"})
+
+    entries = [{"name": "close",
+                "url": "javascript:history.go(-1);",
+                "img": "icon-remove"}]
+    menu += render_to_string(
+        'common/buttons_list.html',
+        {"entries": entries, "extraclasses": "pull-right"}
+    )
 
     return menu
 
+
 @register.simple_tag
 def viewm_menu_simple(user, mail_id, rcpt, secret_id=""):
     entries = [
-        {"name" : "release",
-         "img" : "icon-white icon-ok",
-         "class" : "btn-success",
-         "url" : reverse(amavis.views.release, args=[mail_id]) \
+        {"name": "release",
+         "img": "icon-white icon-ok",
+         "class": "btn-success",
+         "url": reverse('modoboa.extensions.amavis.views.release', args=[mail_id]) \
              + ("?rcpt=%s" % rcpt \
                     + (("&secret_id=%s" % secret_id) if secret_id != "" else "")),
-         "label" : _("Release")},
-        {"name" : "delete",
-         "img" : "icon-white icon-trash",
-         "class" : "btn-danger",
-         "url" : reverse(amavis.views.delete, args=[mail_id]) \
+         "label": _("Release")},
+        {"name": "delete",
+         "img": "icon-white icon-trash",
+         "class": "btn-danger",
+         "url": reverse('modoboa.extensions.amavis.views.delete', args=[mail_id]) \
              + "?rcpt=%s" % rcpt \
              + ("&secret_id=%s" % secret_id if secret_id != "" else ""),
-         "label" : _("Delete")},
-        ]
+         "label": _("Delete")},
+    ]
+
+    return render_to_string('common/buttons_list.html',
+                            {"entries": entries})
 
-    return render_to_string('common/buttons_list.html', 
-                            {"entries" : entries})
 
 @register.simple_tag
 def quar_menu(user):
     entries = [
-        {"name" : "release-multi",
-         "url" : reverse(amavis.views.process),
-         "img" : "icon-white icon-ok",
-         "class" : "btn-success",
-         "label" : _("Release")},
-        {"name" : "delete-multi",
-         "img" : "icon-white icon-trash",
-         "class" : "btn-danger",
-         "url" : reverse(amavis.views.process),
-         "label" : _("Delete")},
-        {"name" : "select",
-         "url" : "",
-         "label" : _("Content Class"),
-         "menu" : [
-                {"name" : "selectmsgs",
-                 "url"  : "",
-                 "label" : _("Nothing")},
-                {"name" : "selectmsgs",
-                 "url" : "S",
-                 "label" : _("Spam")},
-                {"name" : "selectmsgs",
-                 "url" : "V",
-                 "label" : _("Virus")},
-                {"name" : "selectmsgs",
-                 "url" : "H",
-                 "label" : _("Bad header")},
-                {"name" : "selectmsgs",
-                 "url" : "M",
-                 "label" : _("Bad MIME")}
-                ]
-         }
-        ]
+        {"name": "release-multi",
+         "url": reverse('modoboa.extensions.amavis.views.process'),
+         "img": "icon-white icon-ok",
+         "class": "btn-success",
+         "label": _("Release")},
+        {"name": "delete-multi",
+         "img": "icon-white icon-trash",
+         "class": "btn-danger",
+         "url": reverse('modoboa.extensions.amavis.views.process'),
+         "label": _("Delete")},
+        {"name": "select",
+         "url": "",
+         "label": _("Content Class"),
+         "menu": [
+             {"name": "selectmsgs",
+              "url": "",
+              "label": _("Nothing")},
+             {"name": "selectmsgs",
+              "url": "S",
+              "label": _("Spam")},
+             {"name": "selectmsgs",
+              "url": "V",
+              "label": _("Virus")},
+             {"name": "selectmsgs",
+              "url": "H",
+              "label": _("Bad header")},
+             {"name": "selectmsgs",
+              "url": "M",
+              "label": _("Bad MIME")}
+         ]}
+    ]
 
     if user.group != 'SimpleUsers':
-        extraopts = [{"name" : "to", "label" : _("To")}]
+        extraopts = [{"name": "to", "label": _("To")}]
     else:
         extraopts = []
     extracontent = render_to_string('common/email_searchbar.html', {
-            "STATIC_URL" : settings.STATIC_URL,
-            "extraopts" : extraopts
-            })
+        "STATIC_URL": settings.STATIC_URL,
+        "extraopts": extraopts
+    })
 
     return render_to_string('common/buttons_list.html', dict(
-            entries=entries, extracontent=extracontent
-            ))
+        entries=entries, extracontent=extracontent
+    ))
diff --git a/modoboa/extensions/amavis/views.py b/modoboa/extensions/amavis/views.py
index b0e2ecf01..261110f2c 100644
--- a/modoboa/extensions/amavis/views.py
+++ b/modoboa/extensions/amavis/views.py
@@ -19,6 +19,7 @@ from modoboa.extensions.admin.models import Mailbox, Domain
 from templatetags.amavis_tags import quar_menu, viewm_menu
 from .lib import selfservice, AMrelease
 from .sql_listing import SQLlisting, SQLemail, get_wrapper
+from .models import Msgrcpt
 
 
 def __back_to_listing(request):
diff --git a/modoboa/extensions/limits/__init__.py b/modoboa/extensions/limits/__init__.py
index 0bbf995fb..2a22f37e8 100644
--- a/modoboa/extensions/limits/__init__.py
+++ b/modoboa/extensions/limits/__init__.py
@@ -8,12 +8,10 @@ from django.contrib.auth.models import Permission, Group
 from django.db import IntegrityError
 from django.contrib.contenttypes.models import ContentType
 from django.utils.translation import ugettext as _, ugettext_lazy
-from django.core.urlresolvers import reverse
 from modoboa.lib import events, parameters
 from modoboa.core.extensions import ModoExtension, exts_pool
 from .forms import ResourcePoolForm
 import controls
-import views
 
 
 class Limits(ModoExtension):
diff --git a/modoboa/extensions/limits/lib.py b/modoboa/extensions/limits/lib.py
index 4fd916cf8..5a395b86c 100644
--- a/modoboa/extensions/limits/lib.py
+++ b/modoboa/extensions/limits/lib.py
@@ -4,7 +4,6 @@
 -------------------------------
 
 """
-from django.contrib.auth.models import Group
 from django.utils.translation import ugettext as _
 from modoboa.lib.exceptions import ModoboaException
 
diff --git a/modoboa/extensions/limits/models.py b/modoboa/extensions/limits/models.py
index 14b27ef74..80f521289 100644
--- a/modoboa/extensions/limits/models.py
+++ b/modoboa/extensions/limits/models.py
@@ -1,10 +1,7 @@
 # coding: utf-8
-
 from django.db import models
-from django.contrib.contenttypes import generic
 from django.utils.translation import ugettext as _, ugettext_lazy
 from modoboa.lib import parameters
-from modoboa.core.models import User
 from django.conf import settings
 
 limits_tpl = [
diff --git a/modoboa/extensions/postfix_autoreply/__init__.py b/modoboa/extensions/postfix_autoreply/__init__.py
index 61608c4fc..7f09472f6 100644
--- a/modoboa/extensions/postfix_autoreply/__init__.py
+++ b/modoboa/extensions/postfix_autoreply/__init__.py
@@ -6,8 +6,7 @@ This module provides a way to integrate Modoboa auto-reply
 functionality into Postfix.
 
 """
-from django.core.urlresolvers import reverse
-from django.utils.translation import ugettext as _, ugettext_lazy
+from django.utils.translation import ugettext_lazy
 from modoboa.lib import events, parameters
 from modoboa.core.extensions import ModoExtension, exts_pool
 from .models import Transport, Alias
@@ -24,7 +23,7 @@ class PostfixAutoreply(ModoExtension):
 
         for dom in Domain.objects.all():
             try:
-                trans = Transport.objects.get(domain="autoreply.%s" % dom.name)
+                Transport.objects.get(domain="autoreply.%s" % dom.name)
             except Transport.DoesNotExist:
                 onCreateDomain(None, dom)
             else:
@@ -32,7 +31,7 @@ class PostfixAutoreply(ModoExtension):
 
             for mb in dom.mailbox_set.all():
                 try:
-                    alias = Alias.objects.get(full_address=mb.full_address)
+                    Alias.objects.get(full_address=mb.full_address)
                 except Alias.DoesNotExist:
                     onCreateMailbox(None, mb)
 
diff --git a/modoboa/extensions/postfix_autoreply/models.py b/modoboa/extensions/postfix_autoreply/models.py
index db41740e5..194411c76 100644
--- a/modoboa/extensions/postfix_autoreply/models.py
+++ b/modoboa/extensions/postfix_autoreply/models.py
@@ -1,7 +1,6 @@
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
-from modoboa.extensions.admin.models import Domain, Mailbox
-
+from modoboa.extensions.admin.models import Mailbox
 
 
 class Transport(models.Model):
diff --git a/modoboa/extensions/sievefilters/templatetags/sfilters_tags.py b/modoboa/extensions/sievefilters/templatetags/sfilters_tags.py
index 0f5667a47..fe996658c 100644
--- a/modoboa/extensions/sievefilters/templatetags/sfilters_tags.py
+++ b/modoboa/extensions/sievefilters/templatetags/sfilters_tags.py
@@ -2,7 +2,7 @@ from django import template
 from django.template.loader import render_to_string
 from django.utils.translation import ugettext as _
 from django.core.urlresolvers import reverse
-from modoboa.lib.webutils import render_actions, static_url
+from modoboa.lib.webutils import render_actions
 
 register = template.Library()
 
diff --git a/modoboa/extensions/sievefilters/views.py b/modoboa/extensions/sievefilters/views.py
index 291f1c0d6..31fce1b29 100644
--- a/modoboa/extensions/sievefilters/views.py
+++ b/modoboa/extensions/sievefilters/views.py
@@ -8,10 +8,9 @@ from django.contrib.auth.decorators import login_required
 from django.utils.translation import ugettext as _
 from django.core.urlresolvers import reverse
 from modoboa.lib import parameters
-from modoboa.lib.webutils import _render_to_string, _render_error, \
+from modoboa.lib.webutils import _render_error, \
     ajax_response, ajax_simple_response
 from modoboa.lib.connections import ConnectionError
-from modoboa.lib.cryptutils import get_password
 from modoboa.extensions.admin.lib import needs_mailbox
 from .lib import SieveClient, SieveClientError
 from .forms import (
diff --git a/modoboa/extensions/stats/grapher.py b/modoboa/extensions/stats/grapher.py
index e19f42bf6..289ae93d2 100644
--- a/modoboa/extensions/stats/grapher.py
+++ b/modoboa/extensions/stats/grapher.py
@@ -1,9 +1,7 @@
 # coding: utf-8
-
 import sys
 import os
 import time
-import datetime
 from django.utils.translation import ugettext as _, ugettext_lazy
 from modoboa.lib import parameters
 
diff --git a/modoboa/extensions/stats/management/commands/logparser.py b/modoboa/extensions/stats/management/commands/logparser.py
index b6df503c3..0f75eb3f8 100644
--- a/modoboa/extensions/stats/management/commands/logparser.py
+++ b/modoboa/extensions/stats/management/commands/logparser.py
@@ -23,7 +23,7 @@ import os
 import re
 import rrdtool
 import string
-from django.core.management.base import BaseCommand, CommandError
+from django.core.management.base import BaseCommand
 from optparse import make_option
 from modoboa.lib import parameters
 from modoboa.extensions.admin.models import Domain
diff --git a/modoboa/extensions/stats/urls.py b/modoboa/extensions/stats/urls.py
index a85687dea..971df5904 100644
--- a/modoboa/extensions/stats/urls.py
+++ b/modoboa/extensions/stats/urls.py
@@ -1,8 +1,8 @@
-from django.conf.urls import patterns, include, url
-
-urlpatterns = patterns('modoboa.extensions.stats.views',
-                       url(r'^$', 'index', name='fullindex'),
-                       url(r'^graphs/$', "graphs"),
-                       )
+from django.conf.urls import patterns, url
 
 
+urlpatterns = patterns(
+    'modoboa.extensions.stats.views',
+    url(r'^$', 'index', name='fullindex'),
+    url(r'^graphs/$', "graphs"),
+)
diff --git a/modoboa/extensions/stats/views.py b/modoboa/extensions/stats/views.py
index a6b95c8e7..b9fee9083 100644
--- a/modoboa/extensions/stats/views.py
+++ b/modoboa/extensions/stats/views.py
@@ -1,6 +1,6 @@
 # coding: utf-8
 from django.shortcuts import render
-from django.utils.translation import ugettext as _, ugettext_lazy
+from django.utils.translation import ugettext as _
 from django.contrib.auth.decorators import (
     login_required, user_passes_test, permission_required
 )
@@ -10,7 +10,7 @@ from modoboa.lib.webutils import (
     _render_to_string, ajax_simple_response
 )
 from modoboa.extensions.admin.models import (
-    Domain, Mailbox
+    Domain
 )
 from modoboa.extensions.stats.grapher import periods, str2Time, Grapher
 
diff --git a/modoboa/extensions/webmail/imaputils.py b/modoboa/extensions/webmail/imaputils.py
index a5db75fab..80d2a324e 100644
--- a/modoboa/extensions/webmail/imaputils.py
+++ b/modoboa/extensions/webmail/imaputils.py
@@ -11,7 +11,6 @@ import time
 from functools import wraps
 from django.utils.translation import ugettext as _
 from modoboa.lib import parameters
-from modoboa.lib import imap_utf7
 from modoboa.lib.connections import ConnectionsManager
 from modoboa.lib.webutils import static_url
 from exceptions import ImapError, WebmailError
diff --git a/modoboa/extensions/webmail/lib.py b/modoboa/extensions/webmail/lib.py
index bd59b19dd..427a917d1 100644
--- a/modoboa/extensions/webmail/lib.py
+++ b/modoboa/extensions/webmail/lib.py
@@ -1,7 +1,6 @@
 # coding: utf-8
 import os
 import re
-import time
 from datetime import datetime, timedelta
 import email
 import lxml
diff --git a/modoboa/extensions/webmail/views.py b/modoboa/extensions/webmail/views.py
index 488135646..4c7c29257 100644
--- a/modoboa/extensions/webmail/views.py
+++ b/modoboa/extensions/webmail/views.py
@@ -22,7 +22,7 @@ from .lib import (
     decode_payload, AttachmentUploadHandler,
     save_attachment, ImapListing, EmailSignature,
     clean_attachments, set_compose_session, send_mail,
-    ImapEmail, ReplyModifier, ForwardModifier
+    ImapEmail
 )
 from templatetags import webmail_tags
 
diff --git a/modoboa/lib/email_listing.py b/modoboa/lib/email_listing.py
index 8cd0115b4..de2a73da7 100644
--- a/modoboa/lib/email_listing.py
+++ b/modoboa/lib/email_listing.py
@@ -1,17 +1,9 @@
 # -*- coding: utf-8 -*-
-import time
 import re
-import os
-import time
-import random
-import hashlib
-import lxml.html
-from lxml import etree
 from django.conf import settings
 from django.template.loader import render_to_string
 from django.template import Template, Context
 from django.utils.translation import ugettext as _
-from modoboa.lib.emailutils import decode
 
 attached_map = {}
 
diff --git a/modoboa/lib/emailutils.py b/modoboa/lib/emailutils.py
index 7a6795d8b..dd8da9f35 100644
--- a/modoboa/lib/emailutils.py
+++ b/modoboa/lib/emailutils.py
@@ -6,7 +6,6 @@ import smtplib
 from email.header import Header, decode_header
 from email.mime.text import MIMEText
 from email.utils import make_msgid, formatdate, parseaddr
-from django.template import Template, Context
 from django.template.loader import render_to_string
 from django.conf import settings
 import u2u_decode
diff --git a/modoboa/lib/ldaputils.py b/modoboa/lib/ldaputils.py
index 6bb909527..28e5e178a 100644
--- a/modoboa/lib/ldaputils.py
+++ b/modoboa/lib/ldaputils.py
@@ -33,9 +33,7 @@ Extracted from `this blog
   one instance to another.
 
 """
-import sys
 import ldap
-import re
 import base64
 import hashlib
 import string
diff --git a/modoboa/lib/parameters.py b/modoboa/lib/parameters.py
index c6989f513..97a3ab270 100644
--- a/modoboa/lib/parameters.py
+++ b/modoboa/lib/parameters.py
@@ -8,10 +8,8 @@ will be available and modifiable directly from the web interface.
 
 Only super users will be able to access this part of the web interface.
 """
-
 import inspect
 import re
-import copy
 from django import forms
 from exceptions import ModoboaException
 
diff --git a/modoboa/lib/permissions.py b/modoboa/lib/permissions.py
index 90c0eea9a..ce5dcb9d7 100644
--- a/modoboa/lib/permissions.py
+++ b/modoboa/lib/permissions.py
@@ -1,5 +1,4 @@
 # coding: utf-8
-from functools import wraps
 from django.contrib.contenttypes.models import ContentType
 from django.utils.translation import ugettext as _
 from django.db import IntegrityError
diff --git a/modoboa/lib/sysutils.py b/modoboa/lib/sysutils.py
index 8ce692064..237f9ea64 100644
--- a/modoboa/lib/sysutils.py
+++ b/modoboa/lib/sysutils.py
@@ -5,7 +5,6 @@ This module extra functions/shortcuts to communicate with the system
 (executing commands, etc.)
 """
 import subprocess
-from modoboa.lib import parameters
 
 
 def exec_cmd(cmd, sudo_user=None, **kwargs):
diff --git a/modoboa/lib/tables.py b/modoboa/lib/tables.py
index ada681a11..4851caeca 100644
--- a/modoboa/lib/tables.py
+++ b/modoboa/lib/tables.py
@@ -9,11 +9,9 @@ output (using standard tags like <table> and co.).
 
 """
 import inspect
-import lxml
 from django.core.urlresolvers import reverse
 from django.utils.translation import ugettext as _
 from django.template import Template, RequestContext, Context
-from django.template.loader import render_to_string
 from templatetags.lib_tags import render_link
 
 
diff --git a/modoboa/lib/templatetags/lib_tags.py b/modoboa/lib/templatetags/lib_tags.py
index 904f9d4a2..4dbbde54f 100644
--- a/modoboa/lib/templatetags/lib_tags.py
+++ b/modoboa/lib/templatetags/lib_tags.py
@@ -1,14 +1,9 @@
 # coding: utf-8
 from datetime import datetime
 from django import template
-from django.contrib import messages
 from django.template import Template, Context
 from django.template.loader import render_to_string
-from django.core.urlresolvers import reverse
-from django.utils.translation import ugettext as _, ugettext_lazy
-from modoboa.lib import events
-from modoboa.lib.sysutils import exec_cmd
-from modoboa.lib.webutils import static_url
+from django.utils.translation import ugettext_lazy
 from modoboa.lib.formutils import SeparatorField
 
 register = template.Library()
diff --git a/modoboa/lib/tests.py b/modoboa/lib/tests.py
index 986d7d7b2..0a0330294 100644
--- a/modoboa/lib/tests.py
+++ b/modoboa/lib/tests.py
@@ -1,5 +1,4 @@
 # coding: utf-8
-import unittest
 from django.test import TestCase
 from django.test.client import Client
 from django.utils import simplejson
@@ -9,7 +8,7 @@ from modoboa.lib import parameters
 
 
 class ModoTestCase(TestCase):
-    
+
     def setUp(self, username="admin", password="password"):
         self.clt = Client()
         self.assertEqual(self.clt.login(username=username, password=password), True)
diff --git a/modoboa/lib/webutils.py b/modoboa/lib/webutils.py
index 0179e0cfc..aa47ea23e 100644
--- a/modoboa/lib/webutils.py
+++ b/modoboa/lib/webutils.py
@@ -3,7 +3,6 @@
 """
 This module contains extra functions/shortcuts used to render HTML.
 """
-import os
 import sys
 import re
 from django.http import HttpResponse, HttpResponseRedirect
diff --git a/modoboa/urls.py b/modoboa/urls.py
index 25d9a2ee9..f100d17e1 100644
--- a/modoboa/urls.py
+++ b/modoboa/urls.py
@@ -1,4 +1,4 @@
-from django.conf.urls import patterns, include, url
+from django.conf.urls import patterns, include
 from django.conf import settings
 from modoboa.core.extensions import exts_pool
 from modoboa.lib import parameters, events