diff --git a/src/backend/core/api/viewsets.py b/src/backend/core/api/viewsets.py
index 137da43..5fbd4ce 100644
--- a/src/backend/core/api/viewsets.py
+++ b/src/backend/core/api/viewsets.py
@@ -85,16 +85,23 @@ class SerializerPerActionMixin:
 
     This mixin is useful to avoid to define a serializer class for each action in the
     `get_serializer_class` method.
-    """
 
-    serializer_classes: dict[str, type] = {}
-    default_serializer_class: type = None
+    Example:
+    ```
+    class MyViewSet(SerializerPerActionMixin, viewsets.GenericViewSet):
+        serializer_class = MySerializer
+        list_serializer_class = MyListSerializer
+        retrieve_serializer_class = MyRetrieveSerializer
+    ```
+    """
 
     def get_serializer_class(self):
         """
         Return the serializer class to use depending on the action.
         """
-        return self.serializer_classes.get(self.action, self.default_serializer_class)
+        if serializer_class := getattr(self, f"{self.action}_serializer_class", None):
+            return serializer_class
+        return super().get_serializer_class()
 
 
 class Pagination(pagination.PageNumberPagination):
@@ -176,7 +183,10 @@ class ContactViewSet(
 
 
 class UserViewSet(
-    mixins.UpdateModelMixin, viewsets.GenericViewSet, mixins.ListModelMixin
+    SerializerPerActionMixin,
+    mixins.UpdateModelMixin,
+    viewsets.GenericViewSet,
+    mixins.ListModelMixin,
 ):
     """
     User viewset for all interactions with user infos and teams.
diff --git a/src/backend/core/tests/test_api_config.py b/src/backend/core/tests/test_api_config.py
index 7e101cd..ea3a65d 100644
--- a/src/backend/core/tests/test_api_config.py
+++ b/src/backend/core/tests/test_api_config.py
@@ -20,7 +20,13 @@ def test_api_config_anonymous():
     assert response.status_code == HTTP_200_OK
     assert response.json() == {
         "LANGUAGES": [["en-us", "English"], ["fr-fr", "French"]],
-        "FEATURES": {"TEAMS": True},
+        "FEATURES": {
+            "CONTACTS_DISPLAY": True,
+            "CONTACTS_CREATE": True,
+            "MAILBOXES_CREATE": True,
+            "TEAMS": True,
+            "TEAMS_CREATE": True,
+        },
         "RELEASE": "NA",
     }
 
@@ -36,6 +42,12 @@ def test_api_config_authenticated():
     assert response.status_code == HTTP_200_OK
     assert response.json() == {
         "LANGUAGES": [["en-us", "English"], ["fr-fr", "French"]],
-        "FEATURES": {"TEAMS": True},
+        "FEATURES": {
+            "CONTACTS_DISPLAY": True,
+            "CONTACTS_CREATE": True,
+            "MAILBOXES_CREATE": True,
+            "TEAMS": True,
+            "TEAMS_CREATE": True,
+        },
         "RELEASE": "NA",
     }
diff --git a/src/helm/env.d/preprod/values.desk.yaml.gotmpl b/src/helm/env.d/preprod/values.desk.yaml.gotmpl
index 0e7f617..6149473 100644
--- a/src/helm/env.d/preprod/values.desk.yaml.gotmpl
+++ b/src/helm/env.d/preprod/values.desk.yaml.gotmpl
@@ -101,6 +101,10 @@ backend:
         name: backend
         key: MAIL_PROVISIONING_API_CREDENTIALS
     FEATURE_TEAMS: False
+    FEATURE_CONTACTS_DISPLAY: False
+    FEATURE_CONTACTS_CREATE: False
+    FEATURE_TEAMS_CREATE: False
+    FEATURE_MAILBOXES_CREATE: False
     SENTRY_DSN: "https://b72746c73d669421e7a8ccd3fab0fad2@sentry.incubateur.net/171"
 
   createsuperuser:
diff --git a/src/helm/env.d/production/values.desk.yaml.gotmpl b/src/helm/env.d/production/values.desk.yaml.gotmpl
index 1d265b1..f7298da 100644
--- a/src/helm/env.d/production/values.desk.yaml.gotmpl
+++ b/src/helm/env.d/production/values.desk.yaml.gotmpl
@@ -101,6 +101,10 @@ backend:
         name: backend
         key: MAIL_PROVISIONING_API_CREDENTIALS
     FEATURE_TEAMS: False
+    FEATURE_CONTACTS_DISPLAY: False
+    FEATURE_CONTACTS_CREATE: False
+    FEATURE_TEAMS_CREATE: False
+    FEATURE_MAILBOXES_CREATE: False
     SENTRY_DSN: "https://b72746c73d669421e7a8ccd3fab0fad2@sentry.incubateur.net/171"
 
   createsuperuser: