diff --git a/modoboa/auth/__init__.py b/modoboa/auth/__init__.py
deleted file mode 100755
index e69de29bb..000000000
diff --git a/modoboa/auth/forms.py b/modoboa/auth/forms.py
deleted file mode 100644
index 143299654..000000000
--- a/modoboa/auth/forms.py
+++ /dev/null
@@ -1,17 +0,0 @@
-# coding: utf-8
-from django import forms
-from django.utils.translation import ugettext_lazy as _
-
-class LoginForm(forms.Form):
-    username = forms.CharField(
-        label=_("Username"),
-        widget=forms.TextInput(attrs={"class": "input-block-level"})
-    )
-    password = forms.CharField(
-        label=_("Password"),
-        widget=forms.PasswordInput(attrs={"class": "input-block-level"})
-    )
-    rememberme = forms.BooleanField(
-        initial=False,
-        required=False
-    )
diff --git a/modoboa/auth/lib.py b/modoboa/auth/lib.py
deleted file mode 100644
index 8808cd240..000000000
--- a/modoboa/auth/lib.py
+++ /dev/null
@@ -1,41 +0,0 @@
-# coding: utf-8
-from Crypto.Cipher import AES
-import base64
-import random
-import string
-from modoboa.lib import parameters
-
-
-def random_key(l=16):
-    """Generate a random key
-
-    :param integer l: the key's length
-    :return: a string
-    """
-    char_set = string.digits + string.letters + string.punctuation
-    return ''.join(random.sample(char_set * l, l))
-
-
-def encrypt(clear):
-    key = parameters.get_admin("SECRET_KEY", app="admin")
-    obj = AES.new(key, AES.MODE_ECB)
-    if type(clear) is unicode:
-        clear = clear.encode("utf-8")
-    if len(clear) % AES.block_size:
-        clear += " " * (AES.block_size - len(clear) % AES.block_size)
-    ciph = obj.encrypt(clear)
-    ciph = base64.b64encode(ciph)
-    return ciph
-
-
-def decrypt(ciph):
-    obj = AES.new(
-        parameters.get_admin("SECRET_KEY", app="admin"), AES.MODE_ECB
-    )
-    ciph = base64.b64decode(ciph)
-    clear = obj.decrypt(ciph)
-    return clear.rstrip(' ')
-
-
-def get_password(request):
-    return decrypt(request.session["password"])
diff --git a/modoboa/auth/models.py b/modoboa/auth/models.py
deleted file mode 100755
index 71a836239..000000000
--- a/modoboa/auth/models.py
+++ /dev/null
@@ -1,3 +0,0 @@
-from django.db import models
-
-# Create your models here.
diff --git a/modoboa/auth/tests.py b/modoboa/auth/tests.py
deleted file mode 100755
index 082b0c52d..000000000
--- a/modoboa/auth/tests.py
+++ /dev/null
@@ -1,23 +0,0 @@
-# coding: utf-8
-"""
-This file demonstrates two different styles of tests (one doctest and one
-unittest). These will both pass when you run "manage.py test".
-
-Replace these with more appropriate tests for your application.
-"""
-
-from django.test import TestCase
-
-class SimpleTest(TestCase):
-    def test_basic_addition(self):
-        """
-        Tests that 1 + 1 always equals 2.
-        """
-        self.failUnlessEqual(1 + 1, 2)
-
-__test__ = {"doctest": """
-Another way to test that 1 + 1 is equal to 2.
-
->>> 1 + 1 == 2
-True
-"""}
diff --git a/modoboa/auth/views.py b/modoboa/auth/views.py
deleted file mode 100755
index 9589e3414..000000000
--- a/modoboa/auth/views.py
+++ /dev/null
@@ -1,69 +0,0 @@
-# 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.utils.translation import ugettext as _
-from modoboa.lib import events, parameters
-from modoboa.lib.webutils import _render_to_string
-from forms import LoginForm
-from modoboa.auth.lib import encrypt
-
-
-def dologin(request):
-    error = None
-    if request.method == "POST":
-        form = LoginForm(request.POST)
-        if form.is_valid():
-            logger = logging.getLogger('modoboa.auth')
-            user = authenticate(username=form.cleaned_data["username"],
-                                password=form.cleaned_data["password"])
-            if user and user.is_active:
-                login(request, user)
-                if not form.cleaned_data["rememberme"]:
-                    request.session.set_expiry(0)
-                if request.user.has_mailbox:
-                    request.session["password"] = encrypt(form.cleaned_data["password"])
-
-                request.session["django_language"] = \
-                    parameters.get_user(request.user, "LANG", app="general")
-
-                logger.info(_("User '%s' successfully logged in" % user.username))
-                events.raiseEvent("UserLogin", request,
-                                  form.cleaned_data["username"],
-                                  form.cleaned_data["password"])
-
-                nextlocation = request.POST.get("next", None)
-                if nextlocation is None or nextlocation == "None":
-                    if user.group == "SimpleUsers":
-                        nextlocation = reverse("modoboa.lib.webutils.topredirection")
-                    else:
-                        nextlocation = reverse("domains")
-                return HttpResponseRedirect(nextlocation)
-            error = _("Your username and password didn't match. Please try again.")
-            logger.warning("Failed connection attempt from '%(addr)s' as user '%(user)s'" \
-                               % {"addr": request.META["REMOTE_ADDR"],
-                                  "user": form.cleaned_data["username"]})
-
-        nextlocation = request.POST.get("next", None)
-        httpcode = 401
-    else:
-        form = LoginForm()
-        nextlocation = request.GET.get("next", None)
-        httpcode = 200
-
-    return HttpResponse(_render_to_string(request, "registration/login.html", {
-        "form": form, "error": error, "next": nextlocation,
-        "annoucements": events.raiseQueryEvent("GetAnnouncement", "loginpage")
-    }), status=httpcode)
-
-dologin = never_cache(dologin)
-
-
-def dologout(request):
-    events.raiseEvent("UserLogout", request)
-    logger = logging.getLogger("modoboa.auth")
-    logger.info(_("User '%s' logged out" % request.user.username))
-    logout(request)
-    return HttpResponseRedirect(reverse(dologin))
diff --git a/modoboa/core/app_settings.py b/modoboa/core/app_settings.py
index 484d59de6..3160ecc9b 100644
--- a/modoboa/core/app_settings.py
+++ b/modoboa/core/app_settings.py
@@ -4,8 +4,8 @@ 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
-from modoboa.auth.lib import random_key
 
 
 def enabled_applications():
diff --git a/modoboa/core/views/auth.py b/modoboa/core/views/auth.py
index b892b0f58..3e2b25561 100644
--- a/modoboa/core/views/auth.py
+++ b/modoboa/core/views/auth.py
@@ -7,8 +7,8 @@ from django.core.urlresolvers import reverse
 from django.utils.translation import ugettext as _
 from modoboa.lib import events, parameters
 from modoboa.lib.webutils import _render_to_string
+from modoboa.lib.cryptutils import encrypt
 from modoboa.core.forms import LoginForm
-from modoboa.auth.lib import encrypt
 
 
 def dologin(request):
diff --git a/modoboa/extensions/sievefilters/__init__.py b/modoboa/extensions/sievefilters/__init__.py
index 01c20a5bf..34fea4f6e 100644
--- a/modoboa/extensions/sievefilters/__init__.py
+++ b/modoboa/extensions/sievefilters/__init__.py
@@ -2,7 +2,7 @@
 from django.utils.translation import ugettext as _, ugettext_lazy
 from django.core.urlresolvers import reverse
 from modoboa.lib import events, parameters
-from modoboa.extensions import ModoExtension, exts_pool
+from modoboa.core.extensions import ModoExtension, exts_pool
 
 
 class SieveFilters(ModoExtension):
@@ -13,7 +13,7 @@ class SieveFilters(ModoExtension):
     url = "sfilters"
 
     def load(self):
-        from app_settings import ParametersForm, UserSettings
+        from .app_settings import ParametersForm, UserSettings
         parameters.register(ParametersForm, ugettext_lazy("Sieve filters"))
         parameters.register(UserSettings, ugettext_lazy("Message filters"))
 
@@ -23,31 +23,31 @@ class SieveFilters(ModoExtension):
 
 exts_pool.register_extension(SieveFilters)
 
+
 @events.observe("UserMenuDisplay")
 def menu(target, user):
-    import views
-
     if target != "options_menu":
         return []
-    if not user.has_mailbox:
+    if not user.mailbox_set.count():
         return []
     return [
-        {"name" : "sievefilters",
-         "label" : _("Message filters"),
-         "url" : reverse(views.index),
-         "img" : "icon-check"}
-        ]
+        {"name": "sievefilters",
+         "label": _("Message filters"),
+         "url": reverse("modobooa.extensions.sievefilters.views.index"),
+         "img": "icon-check"}
+    ]
+
 
 @events.observe("UserLogout")
 def userlogout(request):
-    from lib import SieveClient
+    from .lib import SieveClient
 
     if not request.user.has_mailbox:
         return
     try:
         sc = SieveClient(user=request.user.username,
                          password=request.session["password"])
-    except Exception, e:
+    except Exception:
         pass
     else:
         sc.logout()
diff --git a/modoboa/extensions/sievefilters/app_settings.py b/modoboa/extensions/sievefilters/app_settings.py
index 9fb60c365..75ae1a684 100644
--- a/modoboa/extensions/sievefilters/app_settings.py
+++ b/modoboa/extensions/sievefilters/app_settings.py
@@ -29,7 +29,7 @@ class ParametersForm(AdminParametersForm):
         initial=4190,
         help_text=_("Listening port of your MANAGESIEVE server")
     )
-    
+
     starttls = YesNoField(
         label=_("Connect using STARTTLS"),
         initial="no",
@@ -59,4 +59,4 @@ class UserSettings(UserParametersForm):
 
     @staticmethod
     def has_access(user):
-        return user.has_mailbox
+        return user.mailbox_set.count() != 0
diff --git a/modoboa/extensions/sievefilters/forms.py b/modoboa/extensions/sievefilters/forms.py
index 41ef3b16a..34cfd47ca 100644
--- a/modoboa/extensions/sievefilters/forms.py
+++ b/modoboa/extensions/sievefilters/forms.py
@@ -7,11 +7,15 @@ from django.utils.html import conditional_escape
 from django.utils.encoding import force_unicode
 from modoboa.extensions.admin.templatetags.admin_tags import gender
 
+
 class FiltersSetForm(forms.Form):
     name = forms.CharField()
-    active = forms.BooleanField(label=gender("Active", "m"), required=False, 
-                                initial=False,
-                                help_text=ugettext_lazy("Check to activate this filters set"))
+    active = forms.BooleanField(
+        label=gender("Active", "m"), required=False,
+        initial=False,
+        help_text=ugettext_lazy("Check to activate this filters set")
+    )
+
 
 class CustomRadioInput(RadioInput):
     def __unicode__(self):
@@ -27,15 +31,16 @@ class CustomRadioInput(RadioInput):
             label_for = ''
         choice_label = conditional_escape(force_unicode(self.choice_label))
         return mark_safe(
-            u'<label%s class="radio inline">%s %s</label>' \
-                % (label_for, self.tag(), choice_label)
-            )
+            u'<label%s class="radio inline">%s %s</label>'
+            % (label_for, self.tag(), choice_label)
+        )
+
 
 class CustomRadioFieldRenderer(RadioFieldRenderer):
     def __iter__(self):
         for i, choice in enumerate(self.choices):
             yield CustomRadioInput(self.name, self.value, self.attrs.copy(), choice, i)
-            
+
     def __getitem__(self, idx):
         choice = self.choices[idx]
         return CustomRadioInput(self.name, self.value, self.attrs.copy(), choice, idx)
@@ -43,9 +48,11 @@ class CustomRadioFieldRenderer(RadioFieldRenderer):
     def render(self):
         return mark_safe(u'\n'.join([force_unicode(w) for w in self]))
 
+
 class CustomRadioSelect(RadioSelect):
     renderer = CustomRadioFieldRenderer
 
+
 class FilterForm(forms.Form):
     def __init__(self, conditions, actions, request, *args, **kwargs):
         super(FilterForm, self).__init__(*args, **kwargs)
@@ -56,30 +63,32 @@ class FilterForm(forms.Form):
                      ("anyof", _("Any of the following")),
                      ("all", _("All messages"))],
             initial="anyof",
-            widget=CustomRadioSelect(attrs={"class" : "radio inline"})
-            )
-        
-        self.header_operators = [("contains", _("contains"), "string"),
-                                 ("notcontains", _("does not contain"), "string"),
-                                 ("is", _("is"), "string"),
-                                 ("isnot", _("is not"), "string")]
-        
+            widget=CustomRadioSelect(attrs={"class": "radio inline"})
+        )
+
+        self.header_operators = [
+            ("contains", _("contains"), "string"),
+            ("notcontains", _("does not contain"), "string"),
+            ("is", _("is"), "string"),
+            ("isnot", _("is not"), "string")
+        ]
+
         self.cond_templates = [
-            {"name" : "Subject", "label" : _("Subject"), "operators" : self.header_operators},
-            {"name" : "From", "label" : _("Sender"), "operators" : self.header_operators},
-            {"name" : "To", "label" : _("Recipient"), "operators" : self.header_operators},
-            {"name" : "Cc", "label" : _("Cc"), "operators" : self.header_operators},
-            {"name" : "size", "label" : _("Size"), 
-             "operators" : [("over", _("is greater than"), "number"),
-                            ("under", _("is less than"), "number")]},
-            ]
-    
+            {"name": "Subject", "label": _("Subject"), "operators": self.header_operators},
+            {"name": "From", "label": _("Sender"), "operators": self.header_operators},
+            {"name": "To", "label": _("Recipient"), "operators": self.header_operators},
+            {"name": "Cc", "label": _("Cc"), "operators": self.header_operators},
+            {"name": "size", "label": _("Size"),
+             "operators": [("over", _("is greater than"), "number"),
+                           ("under", _("is less than"), "number")]},
+        ]
+
         self.action_templates = [
-            {"name" : "fileinto", "label" : _("Move message to"),
-             "args" : [{"type" : "list", "vloader" : "userfolders"}]},
-            {"name" : "redirect", "label" : _("Redirect message to"),
-             "args" : [{"type" : "string"}]},
-            ]
+            {"name": "fileinto", "label": _("Move message to"),
+             "args": [{"type": "list", "vloader": "userfolders"}]},
+            {"name": "redirect", "label": _("Redirect message to"),
+             "args": [{"type": "string"}]},
+        ]
 
         self.conds_cnt = 0
         for c in conditions:
@@ -93,7 +102,7 @@ class FilterForm(forms.Form):
         ops = []
         vfield = None
         for tpl in self.cond_templates:
-            targets += [(tpl["name"], tpl["label"]),]
+            targets += [(tpl["name"], tpl["label"]), ]
             if tpl["name"] != name:
                 continue
             for opdef in tpl["operators"]:
@@ -109,7 +118,7 @@ class FilterForm(forms.Form):
             forms.ChoiceField(initial=op, choices=ops)
         self.fields["cond_value_%d" % self.conds_cnt] = vfield
         self.conds_cnt += 1
-    
+
     def _build_Subject_field(self, op, value):
         self._build_header_field("Subject", op, value)
 
@@ -129,7 +138,7 @@ class FilterForm(forms.Form):
         actions = []
         args = None
         for tpl in self.action_templates:
-            actions += [(tpl["name"], tpl["label"]),]
+            actions += [(tpl["name"], tpl["label"]), ]
             if name == tpl["name"]:
                 args = tpl["args"]
         self.fields["action_name_%d" % self.actions_cnt] = \
@@ -153,12 +162,12 @@ class FilterForm(forms.Form):
     def __build_folders_list(self, folders, user, imapc, parentmb=None):
         ret = []
         for fd in folders:
-            value = fd["path"] if fd.has_key("path") else fd["name"]
+            value = fd["path"] if "path" in fd else fd["name"]
             if parentmb:
                 ret += [(value, fd["name"].replace("%s." % parentmb, ""))]
             else:
                 ret += [(value, fd["name"])]
-            if fd.has_key("sub"):
+            if "sub" in fd:
                 submboxes = imapc.getmboxes(user, value, unseen_messages=False)
                 ret += self.__build_folders_list(submboxes, user, imapc, value)
         return ret
@@ -191,7 +200,8 @@ class FilterForm(forms.Form):
             actions += [naction]
 
         return (conditions, actions)
-    
+
+
 def build_filter_form_from_qdict(request):
     conditions = []
     actions = []
@@ -204,7 +214,7 @@ def build_filter_form_from_qdict(request):
         while True:
             if cpt == int(request.POST["conds"]):
                 break
-            if request.POST.has_key("cond_target_%d" % i):
+            if "cond_target_%d" % i in request.POST:
                 qdict["cond_target_%d" % cpt] = request.POST["cond_target_%d" % i]
                 qdict["cond_operator_%d" % cpt] = request.POST["cond_operator_%d" % i]
                 qdict["cond_value_%d" % cpt] = request.POST["cond_value_%d" % i]
@@ -219,7 +229,7 @@ def build_filter_form_from_qdict(request):
     while True:
         if cpt == int(request.POST["actions"]):
             break
-        if request.POST.has_key("action_name_%d" % i):         
+        if "action_name_%d" % i in request.POST:
             qdict["action_name_%d" % cpt] = request.POST["action_name_%d" % i]
             action = request.POST["action_name_%d" % i]
             argcpt = 0
@@ -239,6 +249,7 @@ def build_filter_form_from_qdict(request):
 
     return FilterForm(conditions, actions, request, qdict)
 
+
 def build_filter_form_from_filter(request, name, fobj):
     from sievelib.commands import SizeCommand, TrueCommand
 
@@ -252,8 +263,8 @@ def build_filter_form_from_filter(request, name, fobj):
         elif isinstance(t, SizeCommand):
             conditions += [("size", t["comparator"][1:], t["limit"])]
         else:
-            conditions += [(t["header-names"].strip('"'), 
-                            t["match-type"][1:], 
+            conditions += [(t["header-names"].strip('"'),
+                            t["match-type"][1:],
                             t["key-list"].strip('"'))]
     actions = []
     for c in fobj.children:
diff --git a/modoboa/extensions/sievefilters/lib.py b/modoboa/extensions/sievefilters/lib.py
index c6ed51883..3cd57d338 100644
--- a/modoboa/extensions/sievefilters/lib.py
+++ b/modoboa/extensions/sievefilters/lib.py
@@ -7,9 +7,11 @@ from sievelib.factory import FiltersSet
 from modoboa.lib import parameters
 from modoboa.lib.connections import ConnectionsManager, ConnectionError
 
+
 class SieveClientError(Exception):
     pass
 
+
 class SieveClient(object):
     __metaclass__ = ConnectionsManager
 
@@ -22,7 +24,7 @@ class SieveClient(object):
             raise ConnectionError(msg)
 
     def login(self, user, password):
-        self.msc = Client(parameters.get_admin("SERVER"), 
+        self.msc = Client(parameters.get_admin("SERVER"),
                           int(parameters.get_admin("PORT")),
                           debug=False)
         use_starttls = True if parameters.get_admin("STARTTLS") == "yes" else False
@@ -31,7 +33,7 @@ class SieveClient(object):
             authmech = None
         try:
             ret = self.msc.connect(user, password, use_starttls, authmech)
-        except Error, e:
+        except Error:
             ret = False
         if not ret:
             return False, _("Connection to MANAGESIEVE server failed, check your configuration")
@@ -40,7 +42,7 @@ class SieveClient(object):
     def logout(self):
         self.msc.logout()
         self.msc = None
-        
+
     def refresh(self, user, password):
         import ssl
 
@@ -85,7 +87,7 @@ class SieveClient(object):
             raise SieveClientError(self.msc.errmsg)
         if active and not self.msc.setactive(name):
             raise SieveClientError(self.msc.errmsg)
-            
+
     def deletescript(self, name):
         if not self.msc.deletescript(name):
             raise SieveClientError(self.msc.errmsg)
diff --git a/modoboa/extensions/sievefilters/templatetags/sfilters_tags.py b/modoboa/extensions/sievefilters/templatetags/sfilters_tags.py
index dbed8e525..0f5667a47 100644
--- a/modoboa/extensions/sievefilters/templatetags/sfilters_tags.py
+++ b/modoboa/extensions/sievefilters/templatetags/sfilters_tags.py
@@ -2,106 +2,108 @@ 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
+from modoboa.lib.webutils import render_actions, static_url
 
 register = template.Library()
 
-from modoboa.lib.webutils import static_url
 
 @register.simple_tag
 def sfilters_menu(user):
     entries = [
-        {"name"  : "newfilterset",
-         "img"   : "icon-plus",
-         "label" : _("New filters set"),
-         "url" : reverse("modoboa.extensions.sievefilters.views.new_filters_set"),
-         "modal" : True,
-         "modalcb" : "filtersetform_cb"
+        {"name": "newfilterset",
+         "img": "icon-plus",
+         "label": _("New filters set"),
+         "url": reverse("modoboa.extensions.sievefilters.views.new_filters_set"),
+         "modal": True,
+         "modalcb": "filtersetform_cb"
          }
-        ]
+    ]
+
+    return render_to_string('common/menulist.html',
+                            {"entries": entries, "user": user})
 
-    return render_to_string('common/menulist.html', 
-                            {"entries" : entries, "user" : user})
 
 @register.simple_tag
 def fset_menu(mode, setname):
     entries = []
     if mode == "gui":
         entries += [
-            {"name" : "newfilter",
-             "img" : "icon-plus",
-             "label" : _("New filter"),
-             "url" : reverse("modoboa.extensions.sievefilters.views.newfilter", 
+            {"name": "newfilter",
+             "img": "icon-plus",
+             "label": _("New filter"),
+             "url": reverse("modoboa.extensions.sievefilters.views.newfilter",
                              args=[setname]),
-             "modal" : True,
-             "autowidth" : True,
-             "modalcb" : "filterform_cb"}
-            ]
+             "modal": True,
+             "autowidth": True,
+             "modalcb": "filterform_cb"}
+        ]
     if mode == "raw":
         entries += [
-            {"name" : "savefs",
-             "img" : "icon-download-alt",
-             "label" : _("Save filters set"),
-             "url" : reverse("modoboa.extensions.sievefilters.views.savefs", 
+            {"name": "savefs",
+             "img": "icon-download-alt",
+             "label": _("Save filters set"),
+             "url": reverse("modoboa.extensions.sievefilters.views.savefs",
                              args=[setname])},
-            ]
-
-    entries += [
-        {"name" : "activatefs",
-         "img" : "icon-ok",
-         "label" : _("Activate filters set"),
-         "url" : reverse("modoboa.extensions.sievefilters.views.activate_filters_set", 
-                         args=[setname])},
-        {"name" : "removefs",
-         "img" : "icon-trash",
-         "label" : _("Remove filters set"),
-         "url" : reverse("modoboa.extensions.sievefilters.views.remove_filters_set", 
-                         args=[setname])},
-        {"name" : "downloadfs",
-         "img" : "icon-download",
-         "label" : _("Download"),
-         "url" : reverse("modoboa.extensions.sievefilters.views.download_filters_set",
-                         args=[setname])}
         ]
 
-    return render_to_string('common/menulist.html', 
-                            {"entries" : entries})
+    entries += [
+        {"name": "activatefs",
+         "img": "icon-ok",
+         "label": _("Activate filters set"),
+         "url": reverse("modoboa.extensions.sievefilters.views.activate_filters_set",
+                         args=[setname])},
+        {"name": "removefs",
+         "img": "icon-trash",
+         "label": _("Remove filters set"),
+         "url": reverse("modoboa.extensions.sievefilters.views.remove_filters_set",
+                         args=[setname])},
+        {"name": "downloadfs",
+         "img": "icon-download",
+         "label": _("Download"),
+         "url": reverse("modoboa.extensions.sievefilters.views.download_filters_set",
+                         args=[setname])}
+    ]
+
+    return render_to_string('common/menulist.html',
+                            {"entries": entries})
+
 
 @register.simple_tag
 def filter_actions(setname, f, position, islast):
     actions = [
-        {"name" : "editfilter",
-         "url" : reverse("modoboa.extensions.sievefilters.views.editfilter",
+        {"name": "editfilter",
+         "url": reverse("modoboa.extensions.sievefilters.views.editfilter",
                          args=[setname, f["name"]]),
-         "img" : "icon-edit",
-         "title" : _("Edit filter"),
-         "modal" : True,
-         "autowidth" : True,
-         "modalcb" : "filterform_cb"},
-        {"name" : "removefilter",
-         "url" : reverse("modoboa.extensions.sievefilters.views.removefilter",
+         "img": "icon-edit",
+         "title": _("Edit filter"),
+         "modal": True,
+         "autowidth": True,
+         "modalcb": "filterform_cb"},
+        {"name": "removefilter",
+         "url": reverse("modoboa.extensions.sievefilters.views.removefilter",
                          args=[setname, f["name"]]),
-         "img" : "icon-trash",
-         "title" : _("Remove this filter")}
-        ]
+         "img": "icon-trash",
+         "title": _("Remove this filter")}
+    ]
     if position != 1:
         actions += [
-            {"name" : "movefilter_up",
-             "url" : reverse("modoboa.extensions.sievefilters.views.move_filter_up",
+            {"name": "movefilter_up",
+             "url": reverse("modoboa.extensions.sievefilters.views.move_filter_up",
                              args=[setname, f["name"]]),
-             "img" : "icon-arrow-up",
-             "title" : _("Move this filter up")}
-            ]
+             "img": "icon-arrow-up",
+             "title": _("Move this filter up")}
+        ]
     if not islast:
         actions += [
-            {"name" : "movefilter_down",
-             "url" : reverse("modoboa.extensions.sievefilters.views.move_filter_down",
+            {"name": "movefilter_down",
+             "url": reverse("modoboa.extensions.sievefilters.views.move_filter_down",
                              args=[setname, f["name"]]),
-             "img" : "icon-arrow-down",
-             "title" : _("Move this filter down")},
-            ]
+             "img": "icon-arrow-down",
+             "title": _("Move this filter down")},
+        ]
     return render_actions(actions)
 
+
 @register.simple_tag
 def display_errors(errors):
     if not len(errors):
@@ -114,8 +116,9 @@ def display_errors(errors):
 </ul>
 """)
     return t.render(template.Context({
-                "errors" : errors
-                }))
+        "errors": errors
+    }))
+
 
 @register.simple_tag
 def display_condition(form, cnt):
@@ -128,12 +131,13 @@ def display_condition(form, cnt):
 </div>
 """)
     return t.render(template.Context({
-                "idx" : cnt,
-                "tfield" : target,
-                "ofield" : operator, 
-                "vfield" : value,
-                "verrors" : display_errors(value.errors)
-                }))
+        "idx": cnt,
+        "tfield": target,
+        "ofield": operator,
+        "vfield": value,
+        "verrors": display_errors(value.errors)
+    }))
+
 
 @register.simple_tag
 def display_action(form, cnt):
@@ -155,7 +159,7 @@ def display_action(form, cnt):
 </div>
 """)
     return t.render(template.Context({
-                "idx" : cnt,
-                "afield" : action, "values" : values, 
-                "verrors" : display_errors(verrors)
-                }))
+        "idx": cnt,
+        "afield": action, "values": values,
+        "verrors": display_errors(verrors)
+    }))
diff --git a/modoboa/extensions/sievefilters/views.py b/modoboa/extensions/sievefilters/views.py
index 8aa7fa06f..6c5999c9f 100644
--- a/modoboa/extensions/sievefilters/views.py
+++ b/modoboa/extensions/sievefilters/views.py
@@ -1,45 +1,51 @@
 # coding: utf-8
 from sievelib.managesieve import Error
+from django.shortcuts import render
 from django.http import HttpResponse
 from django.template.loader import render_to_string
 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, _render_to_string, _render_error, \
+from modoboa.lib.webutils import _render_to_string, _render_error, \
     ajax_response, ajax_simple_response
-from modoboa.lib.decorators import needs_mailbox
 from modoboa.lib.connections import ConnectionError
-from modoboa.auth.lib import get_password
-from lib import *
-from forms import *
+from modoboa.lib.cryptutils import get_password
+from modoboa.extensions.admin.lib import needs_mailbox
+from .lib import SieveClient, SieveClientError
+from .forms import (
+    FilterForm, build_filter_form_from_qdict, build_filter_form_from_filter,
+    FiltersSetForm
+)
 from templatetags.sfilters_tags import fset_menu
 
+
 @login_required
 @needs_mailbox()
 def index(request, tplname="sievefilters/index.html"):
     try:
-        sc = SieveClient(user=request.user.username, 
+        sc = SieveClient(user=request.user.username,
                          password=request.session["password"])
     except ConnectionError, e:
-        return _render_error(request, user_context={"error" : e})
-    
+        return _render_error(request, user_context={"error": e})
+
     try:
         active_script, scripts = sc.listscripts()
     except Error, e:
-        return _render_error(request, user_context={"error" : e})
+        return _render_error(request, user_context={"error": e})
 
     if active_script is None:
         active_script = ""
         default_script = "%s/" % scripts[0] if len(scripts) else ""
     else:
         default_script = "%s/" % active_script
-    return _render(request, tplname, {
-            "selection" : "user",
-            "active_script" : active_script,
-            "default_script" : default_script,
-            "scripts" : sorted(scripts),
-            })
+    return render(request, tplname, {
+        "selection": "user",
+        "active_script": active_script,
+        "default_script": default_script,
+        "scripts": sorted(scripts),
+    })
+
 
 @login_required
 @needs_mailbox()
@@ -48,10 +54,11 @@ def get_templates(request, ftype):
         return ajax_simple_response(FilterForm([], [], request).cond_templates)
     return ajax_simple_response(FilterForm([], [], request).action_templates)
 
+
 @login_required
 @needs_mailbox()
 def getfs(request, name):
-    sc = SieveClient(user=request.user.username, 
+    sc = SieveClient(user=request.user.username,
                      password=request.session["password"])
     editormode = parameters.get_user(request.user, "EDITOR_MODE")
     error = None
@@ -67,30 +74,32 @@ def getfs(request, name):
         return ajax_response(request, "ko", respmsg=error)
 
     if editormode == "raw":
-        htmlcontent =  render_to_string("sievefilters/rawfilter.html", dict(
-                name=name, scriptcontent=content
-                ))
+        htmlcontent = render_to_string("sievefilters/rawfilter.html", dict(
+            name=name, scriptcontent=content
+        ))
     else:
         htmlcontent = render_to_string("sievefilters/guieditor.html", dict(
-                fs=content
-                ))
+            fs=content
+        ))
 
     menu = '<ul id="fsetmenu" class="nav nav-list"><li class="nav-header">%s</li>%s</ul>' % \
-            (_("Actions"), fset_menu(editormode, name))
+        (_("Actions"), fset_menu(editormode, name))
     resp = dict(status="ok", menu=menu, content=htmlcontent)
     return ajax_simple_response(resp)
 
+
 def build_filter_ctx(ctx, form):
     ctx["form"] = form
     ctx["conds_nb"] = range(form.conds_cnt)
     ctx["actions_nb"] = range(form.actions_cnt)
     return ctx
 
+
 def submitfilter(request, setname, okmsg, tplname, tplctx, update=False, sc=None):
     form = build_filter_form_from_qdict(request)
     if form.is_valid():
         if sc is None:
-            sc = SieveClient(user=request.user.username, 
+            sc = SieveClient(user=request.user.username,
                              password=request.session["password"])
         fset = sc.getscript(setname, format="fset")
         conditions, actions = form.tofilter()
@@ -110,6 +119,7 @@ def submitfilter(request, setname, okmsg, tplname, tplctx, update=False, sc=None
     tplctx = build_filter_ctx(tplctx, form)
     return ajax_response(request, status="ko", template=tplname, **tplctx)
 
+
 @login_required
 @needs_mailbox()
 def newfilter(request, setname, tplname="sievefilters/filter.html"):
@@ -119,15 +129,18 @@ def newfilter(request, setname, tplname="sievefilters/filter.html"):
         action=reverse(newfilter, args=[setname]),
         action_label=_("Create"),
         action_classes="submit"
-        )
+    )
     if request.method == "POST":
-        return submitfilter(request, setname, _("Filter created"), tplname, ctx)
+        return submitfilter(
+            request, setname, _("Filter created"), tplname, ctx
+        )
 
     conds = [("Subject", "contains", "")]
     actions = [("fileinto", "")]
     form = FilterForm(conds, actions, request)
     ctx = build_filter_ctx(ctx, form)
-    return _render(request, tplname, ctx)
+    return render(request, tplname, ctx)
+
 
 @login_required
 @needs_mailbox()
@@ -138,13 +151,13 @@ def editfilter(request, setname, fname, tplname="sievefilters/filter.html"):
         action=reverse(editfilter, args=[setname, fname]),
         action_label=_("Update"),
         action_classes="submit"
-        )
-    sc = SieveClient(user=request.user.username, 
+    )
+    sc = SieveClient(user=request.user.username,
                      password=request.session["password"])
     if request.method == "POST":
         return submitfilter(request, setname, _("Filter modified"), tplname, ctx,
                             update=True, sc=sc)
-            
+
     fset = sc.getscript(setname, format="fset")
     f = fset.getfilter(fname)
     form = build_filter_form_from_filter(request, fname, f)
@@ -152,12 +165,13 @@ def editfilter(request, setname, fname, tplname="sievefilters/filter.html"):
     ctx["oldname"] = fname
     ctx["hidestyle"] = "none" \
         if form.fields["match_type"].initial == "all" else "block"
-    return _render(request, tplname, ctx)
+    return render(request, tplname, ctx)
+
 
 @login_required
 @needs_mailbox()
 def removefilter(request, setname, fname):
-    sc = SieveClient(user=request.user.username, 
+    sc = SieveClient(user=request.user.username,
                      password=request.session["password"])
     fset = sc.getscript(setname, format="fset")
     if fset.removefilter(fname):
@@ -165,12 +179,13 @@ def removefilter(request, setname, fname):
         return ajax_response(request, respmsg=_("Filter removed"))
     return ajax_response(request, "ko", respmsg=_("Failed to remove filter"))
 
+
 @login_required
 @needs_mailbox()
 def savefs(request, name):
-    if not request.POST.has_key("scriptcontent"):
+    if not "scriptcontent" in request.POST:
         return
-    sc = SieveClient(user=request.user.username, 
+    sc = SieveClient(user=request.user.username,
                      password=request.session["password"])
     try:
         sc.pushscript(name, request.POST["scriptcontent"])
@@ -178,22 +193,23 @@ def savefs(request, name):
         error = str(e)
         return ajax_response(request, "ko", respmsg=error)
     return ajax_response(request, respmsg=_("Filters set saved"))
-    
+
+
 @login_required
 @needs_mailbox()
 def new_filters_set(request, tplname="common/generic_modal_form.html"):
-    ctx = {"title" : _("Create a new filters set"),
-           "formid" : "newfiltersset",
-           "action_label" : _("Create"),
-           "action_classes" : "submit",
-           "action" : reverse(new_filters_set),
-           "withmenu" : False,
-           "withunseen" : False}
+    ctx = {"title": _("Create a new filters set"),
+           "formid": "newfiltersset",
+           "action_label": _("Create"),
+           "action_classes": "submit",
+           "action": reverse(new_filters_set),
+           "withmenu": False,
+           "withunseen": False}
     if request.method == "POST":
         form = FiltersSetForm(request.POST)
         error = None
         if form.is_valid():
-            sc = SieveClient(user=request.user.username, 
+            sc = SieveClient(user=request.user.username,
                              password=request.session["password"])
             try:
                 sc.pushscript(form.cleaned_data["name"], "# Empty script",
@@ -202,7 +218,7 @@ def new_filters_set(request, tplname="common/generic_modal_form.html"):
                 error = str(e)
             else:
                 return ajax_simple_response({
-                    "status": "ok", 
+                    "status": "ok",
                     "url": form.cleaned_data["name"],
                     "active": form.cleaned_data["active"],
                     "respmsg": _("Filters set created")
@@ -213,12 +229,13 @@ def new_filters_set(request, tplname="common/generic_modal_form.html"):
         return ajax_response(request, status="ko", template=tplname, **ctx)
 
     ctx["form"] = FiltersSetForm()
-    return _render(request, tplname, ctx)
+    return render(request, tplname, ctx)
+
 
 @login_required
 @needs_mailbox()
 def remove_filters_set(request, name):
-    sc = SieveClient(user=request.user.username, 
+    sc = SieveClient(user=request.user.username,
                      password=request.session["password"])
     try:
         sc.deletescript(name)
@@ -226,13 +243,14 @@ def remove_filters_set(request, name):
         return ajax_simple_response(dict(status="ko", respmsg=str(e)))
     acs, scripts = sc.listscripts()
     return ajax_simple_response(dict(
-            status="ok", respmsg=_("Filters set deleted"), newfs=acs
-            ))
+        status="ok", respmsg=_("Filters set deleted"), newfs=acs
+    ))
+
 
 @login_required
 @needs_mailbox()
 def activate_filters_set(request, name):
-    sc = SieveClient(user=request.user.username, 
+    sc = SieveClient(user=request.user.username,
                      password=request.session["password"])
     try:
         sc.activatescript(name)
@@ -240,10 +258,11 @@ def activate_filters_set(request, name):
         return ajax_response(request, "ko", respmsg=str(e))
     return ajax_response(request, respmsg=_("Filters set activated"))
 
+
 @login_required
 @needs_mailbox()
 def download_filters_set(request, name):
-    sc = SieveClient(user=request.user.username, 
+    sc = SieveClient(user=request.user.username,
                      password=request.session["password"])
     try:
         script = sc.getscript(name)
@@ -256,10 +275,11 @@ def download_filters_set(request, name):
     resp["Content-Disposition"] = 'attachment; filename="%s.txt"' % name
     return resp
 
+
 @login_required
 @needs_mailbox()
 def toggle_filter_state(request, setname, fname):
-    sc = SieveClient(user=request.user.username, 
+    sc = SieveClient(user=request.user.username,
                      password=request.session["password"])
     try:
         fset = sc.getscript(setname, format="fset")
@@ -276,15 +296,16 @@ def toggle_filter_state(request, setname, fname):
         sc.pushscript(setname, str(fset))
     except SieveClientError, e:
         return ajax_response(request, "ko", respmsg=str(e))
-    
+
     return ajax_simple_response({
-            "status" : "ok",
-            "label" : newstate,
-            "color" : color
-            })
+        "status": "ok",
+        "label": newstate,
+        "color": color
+    })
+
 
 def move_filter(request, setname, fname, direction):
-    sc = SieveClient(user=request.user.username, 
+    sc = SieveClient(user=request.user.username,
                      password=request.session["password"])
     try:
         fset = sc.getscript(setname, format="fset")
@@ -292,13 +313,17 @@ def move_filter(request, setname, fname, direction):
         sc.pushscript(setname, str(fset))
     except (SieveClientError), e:
         return ajax_response(request, "ko", respmsg=str(e))
-    return ajax_response(request, template="sievefilters/guieditor.html", fs=fset)
+    return ajax_response(
+        request, template="sievefilters/guieditor.html", fs=fset
+    )
+
 
 @login_required
 @needs_mailbox()
 def move_filter_up(request, setname, fname):
     return move_filter(request, setname, fname, "up")
 
+
 @login_required
 @needs_mailbox()
 def move_filter_down(request, setname, fname):
diff --git a/modoboa/extensions/webmail/lib.py b/modoboa/extensions/webmail/lib.py
index df40d947a..8f1bcccb8 100644
--- a/modoboa/extensions/webmail/lib.py
+++ b/modoboa/extensions/webmail/lib.py
@@ -644,7 +644,7 @@ def send_mail(request, posturl=None):
     from email.mime.multipart import MIMEMultipart
     from .forms import ComposeMailForm
     from modoboa.lib.webutils import _render_to_string
-    from modoboa.auth.lib import get_password
+    from modoboa.lib.cryptutils import get_password
 
     form = ComposeMailForm(request.POST)
     editormode = parameters.get_user(request.user, "EDITOR")
diff --git a/modoboa/lib/connections.py b/modoboa/lib/connections.py
index 0cff589e0..adbe58b94 100644
--- a/modoboa/lib/connections.py
+++ b/modoboa/lib/connections.py
@@ -1,23 +1,24 @@
-from modoboa.auth.lib import decrypt
+from modoboa.lib.cryptutils import decrypt
+
 
 class ConnectionsManager(type):
     """Singleton pattern implementation
 
     This class is specialized in connection management.
     """
-    def __init__(cls, name, bases, dict):
-        super(ConnectionsManager, cls).__init__(name, bases, dict)
+    def __init__(cls, name, bases, ctx):
+        super(ConnectionsManager, cls).__init__(name, bases, ctx)
         cls.instances = {}
 
     def __call__(cls, **kwargs):
         key = None
-        if kwargs.has_key("user"):
+        if "user" in kwargs:
             key = kwargs["user"]
         else:
             return None
-        if not cls.instances.has_key(key):
+        if not key in cls.instances:
             cls.instances[key] = None
-        if kwargs.has_key("password"):
+        if "password" in kwargs:
             kwargs["password"] = decrypt(kwargs["password"])
 
         if cls.instances[key] is None:
@@ -27,5 +28,6 @@ class ConnectionsManager(type):
             cls.instances[key].refresh(key, kwargs["password"])
         return cls.instances[key]
 
+
 class ConnectionError(Exception):
     pass