diff --git a/django_etebase/app_settings.py b/django_etebase/app_settings.py
index b608717..3c659c8 100644
--- a/django_etebase/app_settings.py
+++ b/django_etebase/app_settings.py
@@ -54,6 +54,13 @@ class AppSettings:
             return self.import_from_str(get_user_queryset)
         return None
 
+    @cached_property
+    def CREATE_USER_FUNC(self):  # pylint: disable=invalid-name
+        func = self._setting("CREATE_USER_FUNC", None)
+        if func is not None:
+            return self.import_from_str(func)
+        return None
+
     @cached_property
     def CHALLENGE_VALID_SECONDS(self):  # pylint: disable=invalid-name
         return self._setting("CHALLENGE_VALID_SECONDS", 60)
diff --git a/django_etebase/serializers.py b/django_etebase/serializers.py
index 29e1d4f..b3f99e0 100644
--- a/django_etebase/serializers.py
+++ b/django_etebase/serializers.py
@@ -20,7 +20,7 @@ from django.contrib.auth import get_user_model
 from django.db import transaction
 from rest_framework import serializers
 from . import models
-from .utils import get_user_queryset
+from .utils import get_user_queryset, create_user
 
 User = get_user_model()
 
@@ -399,7 +399,10 @@ class AuthenticationSignupSerializer(serializers.Serializer):
                 instance = user_queryset.get(**{User.USERNAME_FIELD: user_data['username'].lower()})
             except User.DoesNotExist:
                 # Create the user and save the casing the user chose as the first name
-                instance = User.objects.create_user(**user_data, password=None, first_name=user_data['username'])
+                try:
+                    instance = create_user(**user_data, password=None, first_name=user_data['username'], view=view)
+                except Exception as e:
+                    raise serializers.ValidationError(e)
 
             if hasattr(instance, 'userinfo'):
                 raise serializers.ValidationError('User already exists')
diff --git a/django_etebase/utils.py b/django_etebase/utils.py
index bce2877..08f81ae 100644
--- a/django_etebase/utils.py
+++ b/django_etebase/utils.py
@@ -10,3 +10,11 @@ def get_user_queryset(queryset, view):
     if custom_func is not None:
         return custom_func(queryset, view)
     return queryset
+
+
+def create_user(*args, **kwargs):
+    custom_func = app_settings.CREATE_USER_FUNC
+    if custom_func is not None:
+        return custom_func(*args, **kwargs)
+    _ = kwargs.pop('view')
+    return User.objects.create_user(*args, **kwargs)