diff --git a/admin/lib.py b/admin/lib.py
index 40b896dd2..d85a4f9cd 100644
--- a/admin/lib.py
+++ b/admin/lib.py
@@ -1,7 +1,26 @@
 # coding: utf-8
 from django.http import HttpResponse, HttpResponseRedirect
 from django.contrib.auth.models import User, Group
+from django.utils.translation import ugettext as _
 from models import *
+from modoboa.lib.webutils import _render_error
+
+def is_not_localadmin(errortpl="error"):
+    def dec(f):
+        def wrapped_f(request, *args, **kwargs):
+            if request.user.id == 1:
+                return _render_error(request, errortpl, {
+                        "error" : _("Invalid action, %(user)s is a local user" \
+                                        % {"user" : request.user.username})
+                        })
+            return f(request, *args, **kwargs)
+
+        wrapped_f.__name__ = f.__name__
+        wrapped_f.__dict__ = f.__dict__
+        wrapped_f.__doc__ = f.__doc__
+        wrapped_f.__module__ = f.__module__
+        return wrapped_f
+    return dec
 
 def is_domain_admin(user):
     """Tell if a user is administrator for a domain of not
diff --git a/admin/models.py b/admin/models.py
index 36a8bf331..aed4cd235 100644
--- a/admin/models.py
+++ b/admin/models.py
@@ -5,8 +5,9 @@ from django.utils.translation import ugettext as _
 from django.dispatch import receiver
 from django.conf import settings
 from modoboa.lib import parameters
-from modoboa.lib import exec_cmd, exec_as_vuser, crypt_password
+from modoboa.lib.sysutils import exec_cmd, exec_as_vuser
 from modoboa.lib.emailutils import split_mailbox
+from modoboa.auth.lib import crypt_password
 import os
 import pwd
 
diff --git a/admin/permissions.py b/admin/permissions.py
index 60c38d821..01c4e2902 100644
--- a/admin/permissions.py
+++ b/admin/permissions.py
@@ -3,7 +3,7 @@
 import datetime
 from django.utils.translation import ugettext as _
 from django.contrib.auth.models import User, Group
-from modoboa.lib import _render, getctx, _render_to_string
+from modoboa.lib.webutils import _render, getctx, _render_to_string
 from forms import *
 
 class Permissions(object):
diff --git a/admin/templatetags/admin_extras.py b/admin/templatetags/admin_extras.py
index 3670d87ae..c2a39923a 100644
--- a/admin/templatetags/admin_extras.py
+++ b/admin/templatetags/admin_extras.py
@@ -3,7 +3,8 @@ from django.template.loader import render_to_string
 from django.utils.translation import ugettext as _
 from django.core.urlresolvers import reverse
 from modoboa import admin
-from modoboa.lib import events, static_url, render_actions
+from modoboa.lib import events
+from modoboa.lib.webutils import static_url, render_actions
 
 register = template.Library()
 
diff --git a/admin/views.py b/admin/views.py
index 206429dd8..b3647dfc1 100644
--- a/admin/views.py
+++ b/admin/views.py
@@ -17,9 +17,10 @@ from modoboa import admin, userprefs
 from models import *
 from admin.permissions import *
 from admin.tables import *
-from modoboa.lib import crypt_password
-from modoboa.lib import _render, ajax_response, ajax_simple_response, \
-    getctx, events, parameters
+from modoboa.lib import events, parameters
+from modoboa.auth.lib import crypt_password
+from modoboa.lib.webutils \
+    import _render, ajax_response, ajax_simple_response, getctx
 from modoboa.lib.emailutils import split_mailbox
 from modoboa.lib.models import Parameter
 import copy
diff --git a/auth/lib.py b/auth/lib.py
index 97c340792..6a6d921ea 100644
--- a/auth/lib.py
+++ b/auth/lib.py
@@ -1,5 +1,7 @@
 # coding: utf-8
 
+import crypt, hashlib
+from random import Random
 from Crypto.Cipher import AES
 import base64
 from modoboa.lib import parameters
@@ -22,3 +24,19 @@ def decrypt(ciph):
 def get_password(request):
     return decrypt(request.session["password"])
 
+def _check_password(password, crypted):
+    scheme = parameters.get_admin("PASSWORD_SCHEME", app="admin")
+    if scheme == "crypt":
+        return crypt.crypt(password, crypted) == crypted
+    if scheme == "md5":
+        return hashlib.md5(password).hexdigest() == crypted
+    return password
+
+def crypt_password(password):
+    scheme = parameters.get_admin("PASSWORD_SCHEME", app="admin")
+    if scheme == "crypt":
+        salt = ''.join(Random().sample(string.letters + string.digits, 2))
+        return crypt.crypt(password, salt)
+    if scheme == "md5":
+        return hashlib.md5(password).hexdigest()
+    return password
diff --git a/extensions/amavis_quarantine/main.py b/extensions/amavis_quarantine/main.py
index cf330f2a8..bfbc0d53a 100644
--- a/extensions/amavis_quarantine/main.py
+++ b/extensions/amavis_quarantine/main.py
@@ -5,7 +5,8 @@
 from django.conf.urls.defaults import *
 from django.utils.translation import ugettext as _, ungettext
 from django.core.urlresolvers import reverse
-from modoboa.lib import events, parameters, static_url
+from modoboa.lib import events, parameters
+from modoboa.lib.webutils import static_url
 
 def infos():
     return {
diff --git a/extensions/amavis_quarantine/sql_listing.py b/extensions/amavis_quarantine/sql_listing.py
index 0f5572f1e..3a9cf9295 100644
--- a/extensions/amavis_quarantine/sql_listing.py
+++ b/extensions/amavis_quarantine/sql_listing.py
@@ -3,7 +3,8 @@
 from datetime import datetime
 from django.utils.translation import ugettext as _
 from django.db.models import Q
-from modoboa.lib import tables, static_url
+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.admin.lib import is_domain_admin
diff --git a/extensions/amavis_quarantine/templatetags/amextras.py b/extensions/amavis_quarantine/templatetags/amextras.py
index 56996dd76..6618d139e 100644
--- a/extensions/amavis_quarantine/templatetags/amextras.py
+++ b/extensions/amavis_quarantine/templatetags/amextras.py
@@ -3,7 +3,7 @@ from django.template.loader import render_to_string
 from django.utils.translation import ugettext as _
 from django.core.urlresolvers import reverse
 from django.conf import settings
-from modoboa.lib import static_url
+from modoboa.lib.webutils import static_url
 from modoboa.extensions import amavis_quarantine
 from modoboa.admin.lib import is_domain_admin
 
diff --git a/extensions/amavis_quarantine/views.py b/extensions/amavis_quarantine/views.py
index b9630077b..2b3a73210 100644
--- a/extensions/amavis_quarantine/views.py
+++ b/extensions/amavis_quarantine/views.py
@@ -9,13 +9,14 @@ from django.core.urlresolvers import reverse
 from django.contrib.auth.decorators \
     import login_required
 from django.db.models import Q
-from modoboa.lib import parameters, _render, getctx, ajax_response
+from modoboa.lib import parameters
+from modoboa.lib.webutils import _render, getctx, ajax_response
 from modoboa.admin.models import Mailbox
 from lib import AMrelease
 from templatetags.amextras import *
 from modoboa.lib.email_listing import parse_search_parameters
 from sql_listing import *
-from admin.lib import is_domain_admin
+from modoboa.admin.lib import is_domain_admin
 
 def __get_current_url(request):
     if request.session.has_key("page"):
diff --git a/extensions/postfix_autoreply/main.py b/extensions/postfix_autoreply/main.py
index f4bd8ff89..ca4ba700d 100644
--- a/extensions/postfix_autoreply/main.py
+++ b/extensions/postfix_autoreply/main.py
@@ -10,7 +10,8 @@ functionality into Postfix.
 from django.conf.urls.defaults import include
 from django.core.urlresolvers import reverse
 from django.utils.translation import ugettext as _
-from modoboa.lib import events, parameters, static_url
+from modoboa.lib import events, parameters
+from modoboa.lib.webutils import static_url
 from models import *
 
 def infos():
diff --git a/extensions/postfix_autoreply/migrations/0002_auto__add_armessage__add_arhistoric.py b/extensions/postfix_autoreply/migrations/0002_auto__add_armessage__add_arhistoric.py
index 5a7fe478f..0f816e834 100644
--- a/extensions/postfix_autoreply/migrations/0002_auto__add_armessage__add_arhistoric.py
+++ b/extensions/postfix_autoreply/migrations/0002_auto__add_armessage__add_arhistoric.py
@@ -3,7 +3,7 @@ import datetime
 from south.db import db
 from south.v2 import SchemaMigration
 from django.db import models
-from modoboa.lib import db_table_exists
+from modoboa.lib.dbutils import db_table_exists
 
 class Migration(SchemaMigration):
     
diff --git a/extensions/postfix_autoreply/views.py b/extensions/postfix_autoreply/views.py
index 580076fc0..abd67f25f 100644
--- a/extensions/postfix_autoreply/views.py
+++ b/extensions/postfix_autoreply/views.py
@@ -7,7 +7,8 @@ from django.contrib.auth.decorators \
 from django.contrib import messages
 from django.core.urlresolvers import reverse
 from django.utils.translation import ugettext as _
-from modoboa.lib import _render, ajax_response, is_not_localadmin
+from modoboa.lib.webutils import _render, ajax_response
+from modoboa.admin.lib import is_not_localadmin
 from forms import *
 from models import *
 
diff --git a/extensions/sievefilters/main.py b/extensions/sievefilters/main.py
index d43c0e1a1..a753bcddf 100644
--- a/extensions/sievefilters/main.py
+++ b/extensions/sievefilters/main.py
@@ -2,7 +2,8 @@
 from django.utils.translation import ugettext as _
 from django.core.urlresolvers import reverse
 from django.conf.urls.defaults import include
-from modoboa.lib import events, parameters, static_url
+from modoboa.lib import events, parameters
+from modoboa.lib.webutils import static_url
 from sievelib.managesieve import SUPPORTED_AUTH_MECHS
 
 def init():
diff --git a/extensions/sievefilters/templatetags/sfilters_tags.py b/extensions/sievefilters/templatetags/sfilters_tags.py
index c924b346f..10e5ac0a9 100644
--- a/extensions/sievefilters/templatetags/sfilters_tags.py
+++ b/extensions/sievefilters/templatetags/sfilters_tags.py
@@ -3,7 +3,7 @@ from django.template.loader import render_to_string
 from django.utils.translation import ugettext as _
 from django.core.urlresolvers import reverse
 from modoboa.extensions.sievefilters import views
-from modoboa.lib import render_actions
+from modoboa.lib.webutils import render_actions
 
 register = template.Library()
 
diff --git a/extensions/sievefilters/views.py b/extensions/sievefilters/views.py
index 51adf8b01..f39fd0f83 100644
--- a/extensions/sievefilters/views.py
+++ b/extensions/sievefilters/views.py
@@ -4,8 +4,10 @@ from django.http import HttpResponse
 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 _render, _render_to_string, _render_error, \
-    ajax_response, ajax_simple_response, is_not_localadmin, parameters
+from modoboa.lib import parameters
+from modoboa.lib.webutils import _render, _render_to_string, _render_error, \
+    ajax_response, ajax_simple_response
+from modoboa.admin.lib import is_not_localadmin
 from modoboa.lib.connections import ConnectionError
 from modoboa.auth.lib import get_password
 from lib import *
diff --git a/extensions/stats/main.py b/extensions/stats/main.py
index 3372e4e42..1a11ffa3a 100644
--- a/extensions/stats/main.py
+++ b/extensions/stats/main.py
@@ -10,7 +10,8 @@ sent, received, bounced, rejected
 from django.core.urlresolvers import reverse
 from django.utils.translation import ugettext as _
 from django.conf.urls.defaults import *
-from modoboa.lib import events, parameters, static_url
+from modoboa.lib import events, parameters
+from modoboa.lib.webutils import static_url
 
 def infos():
     return {
diff --git a/extensions/stats/views.py b/extensions/stats/views.py
index ecb933ae5..0abe10575 100644
--- a/extensions/stats/views.py
+++ b/extensions/stats/views.py
@@ -4,7 +4,7 @@ from django.http import HttpResponse
 from django.core.urlresolvers import reverse
 from django.utils.translation import ugettext as _
 from django.utils import simplejson
-from modoboa.lib import _render, _render_to_string, getctx
+from modoboa.lib.webutils import _render, _render_to_string, getctx
 from modoboa.admin.views import good_domain
 from modoboa.admin.models import Domain, Mailbox
 from django.contrib.auth.decorators \
diff --git a/extensions/webmail/lib.py b/extensions/webmail/lib.py
index 1e05fa761..f1c5c50b5 100644
--- a/extensions/webmail/lib.py
+++ b/extensions/webmail/lib.py
@@ -14,8 +14,8 @@ import email
 import lxml
 from django.utils.translation import ugettext as _
 from django.conf import settings
-from modoboa.lib import decode, u2u_decode, tables, \
-    imap_utf7, static_url, parameters
+from modoboa.lib import u2u_decode, tables, imap_utf7, parameters
+from modoboa.lib.webutils import static_url
 from modoboa.lib.connections import ConnectionsManager
 from modoboa.lib.email_listing import MBconnector, EmailListing
 from modoboa.lib.emailutils import *
diff --git a/extensions/webmail/main.py b/extensions/webmail/main.py
index 88d6adf1c..77a86ec60 100644
--- a/extensions/webmail/main.py
+++ b/extensions/webmail/main.py
@@ -2,7 +2,8 @@
 from django.utils.translation import ugettext as _
 from django.core.urlresolvers import reverse
 from django.conf.urls.defaults import include
-from modoboa.lib import events, parameters, static_url
+from modoboa.lib import events, parameters
+from modoboa.lib.webutils import static_url
 
 def init():
     events.register("UserMenuDisplay", menu)
diff --git a/extensions/webmail/middleware.py b/extensions/webmail/middleware.py
index 2b3bd5089..528f65a99 100644
--- a/extensions/webmail/middleware.py
+++ b/extensions/webmail/middleware.py
@@ -1,6 +1,6 @@
 # coding: utf-8
 
-from modoboa.lib import ajax_response
+from modoboa.lib.webutils import ajax_response
 from modoboa.extensions.webmail.lib import WebmailError
 
 class WebmailErrorMiddleware(object):
diff --git a/extensions/webmail/templatetags/webextras.py b/extensions/webmail/templatetags/webextras.py
index 92feb0a69..7c8dd1fd4 100644
--- a/extensions/webmail/templatetags/webextras.py
+++ b/extensions/webmail/templatetags/webextras.py
@@ -5,7 +5,8 @@ from django.core.urlresolvers import reverse
 from django.conf import settings
 from modoboa.extensions import webmail
 from modoboa.extensions.webmail.lib import IMAPheader
-from modoboa.lib import parameters, static_url
+from modoboa.lib import parameters
+from modoboa.lib.webutils import static_url
 
 register = template.Library()
 
diff --git a/extensions/webmail/views.py b/extensions/webmail/views.py
index edf8acb92..e916375a3 100644
--- a/extensions/webmail/views.py
+++ b/extensions/webmail/views.py
@@ -10,11 +10,12 @@ from django.core.urlresolvers import reverse
 from django.contrib.auth.decorators import login_required
 from django.contrib import messages
 from modoboa.admin.models import Mailbox
-from modoboa.lib import parameters, _render, _render_error, \
-    getctx, is_not_localadmin, _render_to_string, \
-    ajax_response
+from modoboa.lib import parameters
+from modoboa.lib.webutils import _render, _render_error, \
+    getctx, _render_to_string, ajax_response
 from modoboa.lib.emailutils import split_mailbox
 from modoboa.lib.email_listing import parse_search_parameters, Paginator
+from modoboa.admin.lib import is_not_localadmin
 from modoboa.auth.lib import *
 from lib import *
 from forms import *
diff --git a/lib/__init__.py b/lib/__init__.py
index 27999c802..e69de29bb 100644
--- a/lib/__init__.py
+++ b/lib/__init__.py
@@ -1,199 +0,0 @@
-# -*- coding: utf-8 -*-
-import os
-import sys
-import time
-import hashlib, crypt, string
-from random import Random
-from django.http import HttpResponse
-from django.conf import settings
-from django import template
-from django.shortcuts import render_to_response
-from django.template.loader import render_to_string
-from django.utils.translation import ugettext as _
-from django.utils import simplejson
-from modoboa.lib import parameters
-
-def exec_cmd(cmd, **kwargs):
-    import subprocess
-
-    p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, **kwargs)
-    output = p.communicate()[0]
-    return p.returncode, output
-
-def _render(request, tpl, user_context):
-    """Custom rendering function
-
-    Just a wrapper which automatically adds a RequestContext instance
-    (useful to use settings variables like MEDIA_URL inside templates)
-    """
-    return render_to_response(tpl, user_context, 
-                              context_instance=template.RequestContext(request))
-
-def _render_to_string(request, tpl, user_context):
-    """Custom rendering function
-
-    Same as _render.
-    """
-    return render_to_string(tpl, user_context,
-                            context_instance=template.RequestContext(request))
-
-def _render_error(request, errortpl="error", user_context={}):
-    return render_to_response("common/%s.html" % errortpl, user_context,
-                              context_instance=template.RequestContext(request))
-
-def render_actions(actions):
-    t = template.Template("""
-{% for a in actions %}
-<a href="{{ a.url }}" name="{{ a.name }}" class="{{ a.class }}" rel="{{ a.rel }}"
-   {% if a.confirm %}onclick="return confirm('{{ a.confirm }}')"{% endif %}>
-  <img src="{{ a.img }}" border="0" title="{{ a.title }}" />
-</a>
-{% endfor %}
-""")
-    return t.render(template.Context({
-                "actions" : actions
-                }))
-
-def exec_as_vuser(cmd):
-    code, output = exec_cmd("sudo -u %s %s" \
-                                % (parameters.get_admin("VIRTUAL_UID", app="admin"), cmd))
-    if code:
-        exec_cmd("echo '%s' >> /tmp/vmail.log" % output)
-        return False
-    return True
-
-def _ctx_ok(url):
-    return {"status" : "ok", "url" : url}
-
-def _ctx_ko(tpl, ctx):
-    return {"status" : "ko", "content" : render_to_string(tpl, ctx)}
-
-def static_url(path):
-    """Returns the correct static url for a given file
-
-    :param path: the targeted static media
-    """
-    if path.startswith("/"):
-        path = path[1:]
-    return "%s%s" % (settings.MEDIA_URL, path)
-
-def getctx(status, level=1, callback=None, **kwargs):
-    if not callback:
-        callername = sys._getframe(level).f_code.co_name
-    else:
-        callername = callback
-    ctx = {"status" : status, "callback" : callername}
-    for kw, v in kwargs.iteritems():
-        ctx[kw] = v
-    return ctx
-
-def ajax_response(request, status="ok", respmsg=None,
-                  url="", ajaxnav=False, norefresh=False, 
-                  template=None, **kwargs):
-    """Ajax response shortcut
-
-    Simple shortcut that sends an JSON response. If a template is
-    provided, a 'content' field will be added to the response,
-    containing the result of this template rendering.
-
-    :param request: a request object
-    :param status: the response status ('ok' or 'ko)
-    :param nexturl: url to display after receiving this response
-    :param template: eventual template's path
-    :param kwargs: dict used for template rendering
-    """
-    ctx = {}
-    for k, v in kwargs.iteritems():
-        ctx[k] = v
-    if template is not None:
-        content = _render_to_string(request, template, ctx)
-    elif kwargs.has_key("content"):
-        content = kwargs["content"]
-    else:
-        content = ""
-    jsonctx = {"status" : status, "content" : content}
-    if respmsg is not None:
-        jsonctx["respmsg"] = respmsg
-    if ajaxnav:
-        jsonctx["ajaxnav"] = True
-    if url != "":
-        jsonctx["url"] = url
-    jsonctx["norefresh"] = norefresh
-    return HttpResponse(simplejson.dumps(jsonctx), mimetype="application/json")
-
-def ajax_simple_response(content):
-    """Simple AJAX response
-
-    No extra formatting is done. The content is passed directly to simplejon.
-
-    :param content: the response's content (list, dict, string)
-    """
-    return HttpResponse(simplejson.dumps(content), mimetype="application/json")
-
-def decode(s, encodings=('utf8', 'latin1', 'windows-1252', 'ascii'), charset=None):
-    if charset is not None:
-        try:
-            return s.decode(charset, 'ignore')
-        except LookupError:
-            pass
-
-    for encoding in encodings:
-        try:
-            return s.decode(encoding)
-        except UnicodeDecodeError:
-            pass
-    return s.decode('ascii', 'ignore')
-
-def is_not_localadmin(errortpl="error"):
-    def dec(f):
-        def wrapped_f(request, *args, **kwargs):
-            if request.user.id == 1:
-                return _render_error(request, errortpl, {
-                        "error" : _("Invalid action, %(user)s is a local user" \
-                                        % {"user" : request.user.username})
-                        })
-            return f(request, *args, **kwargs)
-
-        wrapped_f.__name__ = f.__name__
-        wrapped_f.__dict__ = f.__dict__
-        wrapped_f.__doc__ = f.__doc__
-        wrapped_f.__module__ = f.__module__
-        return wrapped_f
-    return dec
-
-def db_table_exists(table, cursor=None):
-    """Check if table exists
-
-    Taken from here:
-    https://gist.github.com/527113/307c2dec09ceeb647b8fa1d6d49591f3352cb034
-
-    """
-    try:
-        if not cursor:
-            from django.db import connection
-            cursor = connection.cursor()
-        if not cursor:
-            raise Exception
-        table_names = connection.introspection.get_table_list(cursor)
-    except:
-        raise Exception("unable to determine if the table '%s' exists" % table)
-    else:
-        return table in table_names
-
-def _check_password(password, crypted):
-    scheme = parameters.get_admin("PASSWORD_SCHEME", app="admin")
-    if scheme == "crypt":
-        return crypt.crypt(password, crypted) == crypted
-    if scheme == "md5":
-        return hashlib.md5(password).hexdigest() == crypted
-    return password
-
-def crypt_password(password):
-    scheme = parameters.get_admin("PASSWORD_SCHEME", app="admin")
-    if scheme == "crypt":
-        salt = ''.join(Random().sample(string.letters + string.digits, 2))
-        return crypt.crypt(password, salt)
-    if scheme == "md5":
-        return hashlib.md5(password).hexdigest()
-    return password
-
diff --git a/lib/authbackends.py b/lib/authbackends.py
index c2fafa886..d49235ccd 100644
--- a/lib/authbackends.py
+++ b/lib/authbackends.py
@@ -1,6 +1,6 @@
 from django.contrib.auth.models import User
 from modoboa.admin.models import Mailbox
-from modoboa.lib import _check_password
+from modoboa.auth.lib import _check_password
 
 class SimpleBackend:
 
diff --git a/lib/dbutils.py b/lib/dbutils.py
new file mode 100644
index 000000000..738b9f6a6
--- /dev/null
+++ b/lib/dbutils.py
@@ -0,0 +1,20 @@
+# coding: utf-8
+from django.db import connection
+            
+def db_table_exists(table, cursor=None):
+    """Check if table exists
+
+    Taken from here:
+    https://gist.github.com/527113/307c2dec09ceeb647b8fa1d6d49591f3352cb034
+
+    """
+    try:
+        if not cursor:
+            cursor = connection.cursor()
+        if not cursor:
+            raise Exception
+        table_names = connection.introspection.get_table_list(cursor)
+    except:
+        raise Exception("unable to determine if the table '%s' exists" % table)
+    else:
+        return table in table_names
diff --git a/lib/email_listing.py b/lib/email_listing.py
index 0bfbdab89..f85201f11 100644
--- a/lib/email_listing.py
+++ b/lib/email_listing.py
@@ -9,7 +9,8 @@ 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 import _render, decode
+from modoboa.lib.webutils import _render
+from modoboa.lib.emailutils import decode
 
 attached_map = {}
 
diff --git a/lib/emailutils.py b/lib/emailutils.py
index ed7bfbfa0..2a6f0102d 100644
--- a/lib/emailutils.py
+++ b/lib/emailutils.py
@@ -7,7 +7,6 @@ import lxml
 from django.template import Template, Context
 from django.template.loader import render_to_string
 import u2u_decode
-from modoboa.lib import decode
 
 class EmailAddress(object):
     def __init__(self, address):
@@ -196,3 +195,17 @@ def split_mailbox(mailbox):
         domain = parts[-1]
         address = "@".join(parts[:-1])
     return (address, domain)
+
+def decode(s, encodings=('utf8', 'latin1', 'windows-1252', 'ascii'), charset=None):
+    if charset is not None:
+        try:
+            return s.decode(charset, 'ignore')
+        except LookupError:
+            pass
+
+    for encoding in encodings:
+        try:
+            return s.decode(encoding)
+        except UnicodeDecodeError:
+            pass
+    return s.decode('ascii', 'ignore')
diff --git a/lib/models.py b/lib/models.py
index 03098b980..9e58b5ace 100644
--- a/lib/models.py
+++ b/lib/models.py
@@ -6,6 +6,6 @@ class Parameter(models.Model):
     value = models.CharField(max_length=255)
 
 class UserParameter(models.Model):
-    user = models.ForeignKey(User)
+    user = models.ForeignKey("auth.User")
     name = models.CharField(max_length=255)
     value = models.CharField(max_length=255)
diff --git a/lib/parameters.py b/lib/parameters.py
index f6ba8c127..8134f6e85 100644
--- a/lib/parameters.py
+++ b/lib/parameters.py
@@ -3,7 +3,6 @@
 import string
 import inspect
 import re
-from modoboa.lib.models import *
 
 """
 This interface provides a simple way to declare and store parameters
@@ -76,6 +75,8 @@ def unregister_app(app):
     return True
 
 def save_admin(name, value, app=None):
+    from models import Parameter
+
     if app is None:
         app = __guess_extension()
     __is_defined(app, 'A', name)
@@ -91,6 +92,8 @@ def save_admin(name, value, app=None):
     return True
 
 def save_user(user, name, value, app=None):
+    from models import UserParameter
+
     if app is None:
         app = __guess_extension()
     __is_defined(app, 'U', name)
@@ -107,6 +110,8 @@ def save_user(user, name, value, app=None):
     return True
 
 def get_admin(name, app=None):
+    from models import Parameter
+
     if app is None:
         app = __guess_extension()
     __is_defined(app, "A", name)
@@ -117,6 +122,8 @@ def get_admin(name, app=None):
     return p.value.decode("string_escape")
 
 def get_user(user, name, app=None):
+    from models import UserParameter
+
     if app is None:
         app = __guess_extension()
     __is_defined(app, "U", name)
diff --git a/lib/sysutils.py b/lib/sysutils.py
new file mode 100644
index 000000000..efa73c957
--- /dev/null
+++ b/lib/sysutils.py
@@ -0,0 +1,23 @@
+# coding: utf-8
+
+"""
+This module extra functions/shortcuts to communicate with the system
+(executing commands, etc.)
+"""
+
+from modoboa.lib import parameters
+
+def exec_cmd(cmd, **kwargs):
+    import subprocess
+
+    p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, **kwargs)
+    output = p.communicate()[0]
+    return p.returncode, output
+
+def exec_as_vuser(cmd):
+    code, output = exec_cmd("sudo -u %s %s" \
+                                % (parameters.get_admin("VIRTUAL_UID", app="admin"), cmd))
+    if code:
+        exec_cmd("echo '%s' >> /tmp/vmail.log" % output)
+        return False
+    return True
diff --git a/lib/templatetags/libextras.py b/lib/templatetags/libextras.py
index 1fa90af2c..ed04ba605 100644
--- a/lib/templatetags/libextras.py
+++ b/lib/templatetags/libextras.py
@@ -3,7 +3,7 @@ import os
 from django.conf import settings
 from django import template
 from django.contrib import messages
-from modoboa.lib import exec_cmd
+from modoboa.lib.sysutils import exec_cmd
 
 register = template.Library()
 
diff --git a/lib/webutils.py b/lib/webutils.py
new file mode 100644
index 000000000..a05380bc1
--- /dev/null
+++ b/lib/webutils.py
@@ -0,0 +1,114 @@
+# coding: utf-8
+
+"""
+This module contains extra functions/shortcuts used to render HTML.
+"""
+import sys
+from django.http import HttpResponse
+from django.shortcuts import render_to_response
+from django.template.loader import render_to_string
+from django import template
+from django.utils import simplejson
+from django.conf import settings
+
+def _render(request, tpl, user_context):
+    """Custom rendering function
+
+    Just a wrapper which automatically adds a RequestContext instance
+    (useful to use settings variables like MEDIA_URL inside templates)
+    """
+    return render_to_response(tpl, user_context, 
+                              context_instance=template.RequestContext(request))
+
+def _render_to_string(request, tpl, user_context):
+    """Custom rendering function
+
+    Same as _render.
+    """
+    return render_to_string(tpl, user_context,
+                            context_instance=template.RequestContext(request))
+
+def _render_error(request, errortpl="error", user_context={}):
+    return render_to_response("common/%s.html" % errortpl, user_context,
+                              context_instance=template.RequestContext(request))
+
+def render_actions(actions):
+    t = template.Template("""
+{% for a in actions %}
+<a href="{{ a.url }}" name="{{ a.name }}" class="{{ a.class }}" rel="{{ a.rel }}"
+   {% if a.confirm %}onclick="return confirm('{{ a.confirm }}')"{% endif %}>
+  <img src="{{ a.img }}" border="0" title="{{ a.title }}" />
+</a>
+{% endfor %}
+""")
+    return t.render(template.Context({
+                "actions" : actions
+                }))
+
+def _ctx_ok(url):
+    return {"status" : "ok", "url" : url}
+
+def _ctx_ko(tpl, ctx):
+    return {"status" : "ko", "content" : render_to_string(tpl, ctx)}
+
+def getctx(status, level=1, callback=None, **kwargs):
+    if not callback:
+        callername = sys._getframe(level).f_code.co_name
+    else:
+        callername = callback
+    ctx = {"status" : status, "callback" : callername}
+    for kw, v in kwargs.iteritems():
+        ctx[kw] = v
+    return ctx
+
+def ajax_response(request, status="ok", respmsg=None,
+                  url="", ajaxnav=False, norefresh=False, 
+                  template=None, **kwargs):
+    """Ajax response shortcut
+
+    Simple shortcut that sends an JSON response. If a template is
+    provided, a 'content' field will be added to the response,
+    containing the result of this template rendering.
+
+    :param request: a request object
+    :param status: the response status ('ok' or 'ko)
+    :param nexturl: url to display after receiving this response
+    :param template: eventual template's path
+    :param kwargs: dict used for template rendering
+    """
+    ctx = {}
+    for k, v in kwargs.iteritems():
+        ctx[k] = v
+    if template is not None:
+        content = _render_to_string(request, template, ctx)
+    elif kwargs.has_key("content"):
+        content = kwargs["content"]
+    else:
+        content = ""
+    jsonctx = {"status" : status, "content" : content}
+    if respmsg is not None:
+        jsonctx["respmsg"] = respmsg
+    if ajaxnav:
+        jsonctx["ajaxnav"] = True
+    if url != "":
+        jsonctx["url"] = url
+    jsonctx["norefresh"] = norefresh
+    return HttpResponse(simplejson.dumps(jsonctx), mimetype="application/json")
+
+def ajax_simple_response(content):
+    """Simple AJAX response
+
+    No extra formatting is done. The content is passed directly to simplejon.
+
+    :param content: the response's content (list, dict, string)
+    """
+    return HttpResponse(simplejson.dumps(content), mimetype="application/json")
+
+def static_url(path):
+    """Returns the correct static url for a given file
+
+    :param path: the targeted static media
+    """
+    if path.startswith("/"):
+        path = path[1:]
+    return "%s%s" % (settings.MEDIA_URL, path)
diff --git a/locale/de/LC_MESSAGES/django.po b/locale/de/LC_MESSAGES/django.po
index a42f01d4a..613995c20 100644
--- a/locale/de/LC_MESSAGES/django.po
+++ b/locale/de/LC_MESSAGES/django.po
@@ -5,7 +5,7 @@
 # Patrick Ben Koetter <p@state-of-mind.de>, 2010-2011.
 msgid ""
 msgstr ""
-"Project-Id-Version: Modoboa-0.8.5\n"
+"Project-Id-Version: Modoboa-0.8.6\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2011-08-25 09:53+0200\n"
 "PO-Revision-Date: 2011-08-25 13:03+0100\n"
diff --git a/locale/de/LC_MESSAGES/djangojs.po b/locale/de/LC_MESSAGES/djangojs.po
index 3e2db2121..31201d7fb 100644
--- a/locale/de/LC_MESSAGES/djangojs.po
+++ b/locale/de/LC_MESSAGES/djangojs.po
@@ -5,7 +5,7 @@
 # Patrick Ben Koetter <p@state-of-mind.de>, 2010-2011.
 msgid ""
 msgstr ""
-"Project-Id-Version: Modoboa-0.8.5\n"
+"Project-Id-Version: Modoboa-0.8.6\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2011-08-25 09:58+0200\n"
 "PO-Revision-Date: 2011-07-10 07:30+0000\n"
diff --git a/tools/pfxadmin_migrate/migrate.py b/tools/pfxadmin_migrate/migrate.py
index a5a1140ba..0bce33811 100755
--- a/tools/pfxadmin_migrate/migrate.py
+++ b/tools/pfxadmin_migrate/migrate.py
@@ -48,7 +48,7 @@ from django.db.models import Q
 from django.contrib.auth.models import Group
 import modoboa.admin.models as md_models
 import models as pf_models
-from modoboa.lib import exec_cmd
+from modoboa.lib.sysutils import exec_cmd
 from modoboa.lib.emailutils import split_mailbox
 
 def migrate_dates(oldobj):
diff --git a/userprefs/forms.py b/userprefs/forms.py
index 72c987f2d..ec6196d15 100644
--- a/userprefs/forms.py
+++ b/userprefs/forms.py
@@ -1,6 +1,6 @@
 from django import forms
 from modoboa.admin.models import Domain, Mailbox
-from modoboa.lib import _check_password
+from modoboa.auth.lib import _check_password
 from django.contrib.auth.models import check_password
 from django.utils.translation import ugettext as _
 from modoboa.lib.emailutils import split_mailbox
diff --git a/userprefs/templatetags/uprefs_extras.py b/userprefs/templatetags/uprefs_extras.py
index 9a844f754..3c34858a3 100644
--- a/userprefs/templatetags/uprefs_extras.py
+++ b/userprefs/templatetags/uprefs_extras.py
@@ -3,7 +3,8 @@ from django.template.loader import render_to_string
 from django.utils.translation import ugettext as _
 from django.core.urlresolvers import reverse
 from modoboa import userprefs
-from modoboa.lib import events, static_url
+from modoboa.lib import events
+from modoboa.lib.webutils import static_url
 from modoboa.admin.lib import is_domain_admin
 
 register = template.Library()
diff --git a/userprefs/views.py b/userprefs/views.py
index 26bb61c7b..cab96d0c5 100644
--- a/userprefs/views.py
+++ b/userprefs/views.py
@@ -4,12 +4,12 @@ from django.http import HttpResponseRedirect
 from django.contrib.auth.decorators \
     import login_required, user_passes_test
 from django.utils.translation import ugettext as _
-from modoboa.lib import _render, ajax_response, parameters
-from modoboa.lib import crypt_password
+from modoboa.lib import parameters
+from modoboa.lib.webutils import _render, ajax_response
 from forms import *
 from modoboa.admin.models import Mailbox, Alias
 from modoboa.admin.lib import is_domain_admin
-from modoboa.auth.lib import encrypt
+from modoboa.auth.lib import encrypt, crypt_password
 
 @login_required
 def index(request):