diff --git a/src/postorius/auth/decorators.py b/src/postorius/auth/decorators.py
index 80f39dc..1b4ea88 100644
--- a/src/postorius/auth/decorators.py
+++ b/src/postorius/auth/decorators.py
@@ -29,7 +29,7 @@
     def wrapper(*args, **kwargs):
         request = args[0]
         if request.user.is_authenticated():
-            print 'already logged in'
+            print('already logged in')
         if not request.user.is_authenticated():
             if request.META.has_key('HTTP_AUTHORIZATION'):
                 authmeth, auth = request.META['HTTP_AUTHORIZATION'].split(' ',
diff --git a/src/postorius/forms.py b/src/postorius/forms.py
index d24651c..a13d814 100644
--- a/src/postorius/forms.py
+++ b/src/postorius/forms.py
@@ -19,7 +19,7 @@
 from django import forms
 from django.core.validators import validate_email, URLValidator
 from django.utils.translation import ugettext_lazy as _
-from fieldset_forms import FieldsetForm
+from postorius.fieldset_forms import FieldsetForm
 
 
 class DomainNew(FieldsetForm):
@@ -560,7 +560,7 @@
 class ListSubscriptionPolicyForm(forms.Form):
     """
     List subscription policy settings.
-    """    
+    """
     subscription_policy = forms.ChoiceField(
         label=_('Subscription Policy'),
         choices=SUBSCRIPTION_POLICY_CHOICES,
diff --git a/src/postorius/models.py b/src/postorius/models.py
index a11584b..bdc7ee8 100644
--- a/src/postorius/models.py
+++ b/src/postorius/models.py
@@ -37,8 +37,10 @@
 from django.template.loader import get_template
 from mailmanclient import MailmanConnectionError
 from postorius.utils import get_client
-from urllib2 import HTTPError
-
+try:
+    from urllib2 import HTTPError
+except ImportError:
+    from urllib.error import HTTPError
 
 logger = logging.getLogger(__name__)
 
diff --git a/src/postorius/tests/mailman_api_tests/test_archival_options.py b/src/postorius/tests/mailman_api_tests/test_archival_options.py
index 5974087..199b93a 100644
--- a/src/postorius/tests/mailman_api_tests/test_archival_options.py
+++ b/src/postorius/tests/mailman_api_tests/test_archival_options.py
@@ -30,7 +30,10 @@
 from django.core.urlresolvers import reverse
 from django.test import Client, RequestFactory, TestCase
 from django.test.utils import override_settings
-from urllib2 import HTTPError
+try:
+    from urllib2 import HTTPError
+except ImportError:
+    from urllib.error import HTTPError
 
 from postorius.forms import ListArchiverForm
 from postorius.tests import MM_VCR
@@ -122,7 +125,7 @@
             archivers = self.m_list.archivers
             # Archiver is enabled by default.
             self.assertTrue(archivers['mail-archive'])
-        
+
         with MM_VCR.use_cassette('test_list_archival_options_disable_archiver.yaml'):
             # Archiver is disabled after it's deactivated in the form.
             response = self.client.post(
@@ -156,7 +159,7 @@
         self.assertTrue('foo-archiver' in mock_warning.call_args[0][1])
         # messages.success should not have been called.
         self.assertEqual(mock_success.call_count, 0)
-        
+
     @mock.patch('django.contrib.messages.success')
     @mock.patch('django.contrib.messages.warning')
     def test_success_messages(self, mock_warning, mock_success):
diff --git a/src/postorius/tests/mailman_api_tests/test_list_index.py b/src/postorius/tests/mailman_api_tests/test_list_index.py
index ce86115..d7d71ac 100644
--- a/src/postorius/tests/mailman_api_tests/test_list_index.py
+++ b/src/postorius/tests/mailman_api_tests/test_list_index.py
@@ -20,7 +20,10 @@
 from django.core.urlresolvers import reverse
 from django.test import Client, SimpleTestCase
 from django.test.utils import override_settings
-from urllib2 import HTTPError
+try:
+    from urllib2 import HTTPError
+except ImportError:
+    from urllib.error import HTTPError
 
 from postorius.utils import get_client
 from postorius.tests import MM_VCR
diff --git a/src/postorius/tests/mailman_api_tests/test_list_members.py b/src/postorius/tests/mailman_api_tests/test_list_members.py
index 21884d5..cd90f8d 100644
--- a/src/postorius/tests/mailman_api_tests/test_list_members.py
+++ b/src/postorius/tests/mailman_api_tests/test_list_members.py
@@ -20,7 +20,10 @@
 from django.core.urlresolvers import reverse
 from django.test import Client, TestCase
 from django.test.utils import override_settings
-from urllib2 import HTTPError
+try:
+    from urllib2 import HTTPError
+except ImportError:
+    from urllib.error import HTTPError
 
 from postorius.tests import MM_VCR
 from postorius.utils import get_client
diff --git a/src/postorius/tests/mailman_api_tests/test_list_new.py b/src/postorius/tests/mailman_api_tests/test_list_new.py
index 49e6224..2824b78 100644
--- a/src/postorius/tests/mailman_api_tests/test_list_new.py
+++ b/src/postorius/tests/mailman_api_tests/test_list_new.py
@@ -21,7 +21,10 @@
 from django.core.urlresolvers import reverse
 from django.test import Client, SimpleTestCase
 from django.test.utils import override_settings
-from urllib2 import HTTPError
+try:
+    from urllib2 import HTTPError
+except ImportError:
+    from urllib.error import HTTPError
 
 from postorius.utils import get_client
 from postorius.tests import MM_VCR
diff --git a/src/postorius/tests/mailman_api_tests/test_list_summary.py b/src/postorius/tests/mailman_api_tests/test_list_summary.py
index dbe927d..acb50d7 100644
--- a/src/postorius/tests/mailman_api_tests/test_list_summary.py
+++ b/src/postorius/tests/mailman_api_tests/test_list_summary.py
@@ -21,7 +21,10 @@
 from django.db import IntegrityError
 from django.test import Client, SimpleTestCase
 from django.test.utils import override_settings
-from urllib2 import HTTPError
+try:
+    from urllib2 import HTTPError
+except ImportError:
+    from urllib.error import HTTPError
 
 from postorius.utils import get_client
 from postorius.tests import MM_VCR
diff --git a/src/postorius/tests/mailman_api_tests/test_models.py b/src/postorius/tests/mailman_api_tests/test_models.py
index e3278c6..655ea42 100644
--- a/src/postorius/tests/mailman_api_tests/test_models.py
+++ b/src/postorius/tests/mailman_api_tests/test_models.py
@@ -21,7 +21,10 @@
 from django.db import IntegrityError
 from django.test import Client, SimpleTestCase
 from django.test.utils import override_settings
-from urllib2 import HTTPError
+try:
+    from urllib2 import HTTPError
+except ImportError:
+    from urllib.error import HTTPError
 
 from postorius.utils import get_client
 from postorius.tests import MM_VCR
diff --git a/src/postorius/tests/mailman_api_tests/test_subscriptions.py b/src/postorius/tests/mailman_api_tests/test_subscriptions.py
index 5216408..6bdd987 100644
--- a/src/postorius/tests/mailman_api_tests/test_subscriptions.py
+++ b/src/postorius/tests/mailman_api_tests/test_subscriptions.py
@@ -20,7 +20,10 @@
 from django.core.urlresolvers import reverse
 from django.test import Client, TestCase
 from django.test.utils import override_settings
-from urllib2 import HTTPError
+try:
+    from urllib2 import HTTPError
+except ImportError:
+    from urllib.error import HTTPError
 
 from postorius.tests import MM_VCR
 from postorius.utils import get_client
diff --git a/src/postorius/views/list.py b/src/postorius/views/list.py
index 890e6cc..304d7cc 100644
--- a/src/postorius/views/list.py
+++ b/src/postorius/views/list.py
@@ -30,8 +30,10 @@
 from django.core.exceptions import ValidationError
 from django.utils.decorators import method_decorator
 from django.utils.translation import gettext as _
-from urllib2 import HTTPError
-
+try:
+    from urllib2 import HTTPError
+except ImportError:
+    from urllib.error import HTTPError
 from postorius import utils
 from postorius.models import (Domain, List, MailmanApiError)
 from postorius.forms import *
@@ -255,7 +257,7 @@
     @method_decorator(login_required)
     def post(self, request, list_id):
         """
-        Subscribes an email address to a mailing list via POST and 
+        Subscribes an email address to a mailing list via POST and
         redirects to the `list_summary` view.
         """
         try:
diff --git a/src/postorius/views/settings.py b/src/postorius/views/settings.py
index a73167a..68bdf07 100644
--- a/src/postorius/views/settings.py
+++ b/src/postorius/views/settings.py
@@ -35,8 +35,10 @@
 from django.template import Context, loader, RequestContext
 from django.utils.decorators import method_decorator
 from django.utils.translation import gettext as _
-from urllib2 import HTTPError
-
+try:
+    from urllib2 import HTTPError
+except ImportError:
+    from urllib.error import HTTPError
 from postorius import utils
 from postorius.models import (Domain, List, Member, MailmanUser,
                               MailmanApiError, Mailman404Error)
diff --git a/src/postorius/views/user.py b/src/postorius/views/user.py
index 950b6c4..4c9d826 100644
--- a/src/postorius/views/user.py
+++ b/src/postorius/views/user.py
@@ -31,7 +31,10 @@
 from django.utils.decorators import method_decorator
 from django.utils.translation import gettext as _
 from django.views.generic import TemplateView
-from urllib2 import HTTPError
+try:
+    from urllib2 import HTTPError
+except ImportError:
+    from urllib.error import HTTPError
 
 from postorius import utils
 from postorius.models import (
@@ -227,7 +230,7 @@
 
 class AddressActivationView(TemplateView):
     """
-    Starts the process of adding additional email addresses to a mailman user 
+    Starts the process of adding additional email addresses to a mailman user
     record. Forms are processes and email notifications are sent accordingly.
     """
 
@@ -367,8 +370,8 @@
 def address_activation_link(request, activation_key):
     """
     Checks the given activation_key. If it is valid, the saved address will be
-    added to mailman. Also, the corresponding profile record will be removed. 
-    If the key is not valid, it will be ignored. 
+    added to mailman. Also, the corresponding profile record will be removed.
+    If the key is not valid, it will be ignored.
     """
     try:
         profile = AddressConfirmationProfile.objects.get(