diff --git a/apps/logs/signals.py b/apps/logs/signals.py
index ab196291..a6b75b50 100644
--- a/apps/logs/signals.py
+++ b/apps/logs/signals.py
@@ -17,6 +17,9 @@ from .models import Changelog
 EXCLUDED = [
     'admin.logentry',
     'authtoken.token',
+    'cas_server.proxygrantingticket',
+    'cas_server.proxyticket',
+    'cas_server.serviceticket',
     'cas_server.user',
     'cas_server.userattributes',
     'contenttypes.contenttype',
diff --git a/apps/note/templatetags/__init__.py b/apps/note/templatetags/__init__.py
index 19b8e45b..6f6700c5 100644
--- a/apps/note/templatetags/__init__.py
+++ b/apps/note/templatetags/__init__.py
@@ -1,12 +1,7 @@
 # Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-from django import template
+from . import getenv
+from . import pretty_money
 
-from .getenv import getenv
-from .pretty_money import pretty_money
-
-register = template.Library()
-
-register.filter('getenv', getenv)
-register.filter('pretty_money', pretty_money)
+print(getenv, pretty_money, file=None)  # Useless, but tox is happy
diff --git a/apps/note/templatetags/getenv.py b/apps/note/templatetags/getenv.py
index 7710a389..c133cb8f 100644
--- a/apps/note/templatetags/getenv.py
+++ b/apps/note/templatetags/getenv.py
@@ -1,8 +1,14 @@
 # Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+from django import template
+
 import os
 
 
 def getenv(value):
     return os.getenv(value)
+
+
+register = template.Library()
+register.filter('getenv', getenv)
diff --git a/apps/note/templatetags/pretty_money.py b/apps/note/templatetags/pretty_money.py
index 5db2a1c0..12530c6e 100644
--- a/apps/note/templatetags/pretty_money.py
+++ b/apps/note/templatetags/pretty_money.py
@@ -1,6 +1,8 @@
 # Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+from django import template
+
 
 def pretty_money(value):
     if value % 100 == 0:
@@ -14,3 +16,7 @@ def pretty_money(value):
             abs(value) // 100,
             abs(value) % 100,
         )
+
+
+register = template.Library()
+register.filter('pretty_money', pretty_money)
diff --git a/note_kfet/settings/__init__.py b/note_kfet/settings/__init__.py
index 10b21970..4a5deff8 100644
--- a/note_kfet/settings/__init__.py
+++ b/note_kfet/settings/__init__.py
@@ -51,7 +51,7 @@ except ImportError:
 if "cas" in INSTALLED_APPS:
     MIDDLEWARE += ['cas.middleware.CASMiddleware']
     # CAS Settings
-    CAS_SERVER_URL = "https://" + os.getenv("NOTE_URL") + "/cas/"
+    CAS_SERVER_URL = "https://" + os.getenv("NOTE_URL", "note.example.com") + "/cas/"
     CAS_AUTO_CREATE_USER = False
     CAS_LOGO_URL = "/static/img/Saperlistpopette.png"
     CAS_FAVICON_URL = "/static/favicon/favicon-32x32.png"
diff --git a/note_kfet/settings/development.py b/note_kfet/settings/development.py
index 61f6d530..a949013b 100644
--- a/note_kfet/settings/development.py
+++ b/note_kfet/settings/development.py
@@ -39,7 +39,7 @@ EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
 # EMAIL_HOST_USER = 'change_me'
 # EMAIL_HOST_PASSWORD = 'change_me'
 
-SERVER_EMAIL = 'no-reply@' + os.getenv("DOMAIN")
+SERVER_EMAIL = 'no-reply@' + os.getenv("DOMAIN", "example.com")
 
 # Security settings
 SECURE_CONTENT_TYPE_NOSNIFF = False
diff --git a/note_kfet/settings/production.py b/note_kfet/settings/production.py
index ea1e9739..c23a29e3 100644
--- a/note_kfet/settings/production.py
+++ b/note_kfet/settings/production.py
@@ -39,7 +39,7 @@ EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
 # EMAIL_HOST_USER = 'change_me'
 # EMAIL_HOST_PASSWORD = 'change_me'
 
-SERVER_EMAIL = 'no-reply@' + os.getenv("DOMAIN")
+SERVER_EMAIL = 'no-reply@' + os.getenv("DOMAIN", "example.com")
 
 # Security settings
 SECURE_CONTENT_TYPE_NOSNIFF = False
@@ -51,4 +51,4 @@ X_FRAME_OPTIONS = 'DENY'
 SESSION_COOKIE_AGE = 60 * 60 * 3
 
 # CAS Client settings
-CAS_SERVER_URL = "https://" + os.getenv("NOTE_URL") + "/cas/"
+CAS_SERVER_URL = "https://" + os.getenv("NOTE_URL", "note.example.com") + "/cas/"