diff --git a/config/settings/base.py b/config/settings/base.py
index bd566f808..8ee1fbdc0 100644
--- a/config/settings/base.py
+++ b/config/settings/base.py
@@ -3,6 +3,8 @@
 from dotenv import load_dotenv
 from machina import MACHINA_MAIN_STATIC_DIR, MACHINA_MAIN_TEMPLATE_DIR
 
+from lacommunaute.utils.enums import Environment
+
 
 load_dotenv()
 
@@ -17,6 +19,8 @@
 SECRET_KEY = os.getenv("DJANGO_SECRET_KEY")
 
 DEBUG = os.getenv("DJANGO_DEBUG", "False") == "True"
+ENVIRONMENT = Environment.PROD
+
 PARKING_PAGE = os.getenv("PARKING_PAGE", "False") == "True"
 
 ALLOWED_HOSTS = os.getenv("ALLOWED_HOSTS", "communaute.inclusion.beta.gouv.fr,").split(",")
diff --git a/config/settings/dev.py b/config/settings/dev.py
index 1583fb20f..94f751e31 100644
--- a/config/settings/dev.py
+++ b/config/settings/dev.py
@@ -1,6 +1,8 @@
 # Enable django-debug-toolbar with Docker.
 import socket
 
+from lacommunaute.utils.enums import Environment
+
 from .base import *  # pylint: disable=wildcard-import,unused-wildcard-import # noqa: F403 F401
 
 
@@ -10,6 +12,7 @@
 
 
 DEBUG = True
+ENVIRONMENT = Environment.DEV
 
 ALLOWED_HOSTS = ["localhost", "0.0.0.0", "127.0.0.1", "192.168.0.1"]
 
diff --git a/config/urls.py b/config/urls.py
index ecc1afb97..a2dfc6e38 100644
--- a/config/urls.py
+++ b/config/urls.py
@@ -49,9 +49,6 @@
     path("tracking/", include(tracking_urlpatterns_factory.urlpatterns)),
 ]
 
-if settings.DEBUG is True:
-    urlpatterns += [path("", include("django.contrib.auth.urls"))]
-
 urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
 
 urlpatterns += [
diff --git a/lacommunaute/templates/layouts/base.html b/lacommunaute/templates/layouts/base.html
index 716e115ff..7503c77d5 100644
--- a/lacommunaute/templates/layouts/base.html
+++ b/lacommunaute/templates/layouts/base.html
@@ -69,6 +69,7 @@
             {% include "partials/header.html" %}
         {% endblock %}
         {% block sub_header %}{% endblock %}
+        {% if ENVIRONMENT != "PROD" %}<div id="debug-mode-banner" class="bg-danger text-white mt-3">DEV MODE</div>{% endif %}
         <main id="main" role="main" class="s-main">
             {% block messages %}
                 {% if messages %}
diff --git a/lacommunaute/users/tests/__snapshots__/tests_views.ambr b/lacommunaute/users/tests/__snapshots__/tests_views.ambr
index 385e7a69d..23905b0dc 100644
--- a/lacommunaute/users/tests/__snapshots__/tests_views.ambr
+++ b/lacommunaute/users/tests/__snapshots__/tests_views.ambr
@@ -527,6 +527,9 @@
           </main>
   '''
 # ---
-# name: TestSendMagicLink.test_send_magic_link[send_magic_link_payload]
-  '{"sender": {"name": "La Communaut\\u00e9", "email": "noreply@inclusion.beta.gouv.fr"}, "to": [{"email": "edith@martin.co"}], "params": {"display_name": "Edith M.", "login_link": "LOGIN_LINK"}, "templateId": 31}'
+# name: TestSendMagicLink.test_send_magic_link[DEV-1][send_magic_link_payload]
+  '{"sender": {"name": "La Communaut\\u00e9", "email": "noreply@inclusion.beta.gouv.fr"}, "to": [{"email": "samuel@jackson.com"}], "params": {"display_name": "Samuel J.", "login_link": "LOGIN_LINK"}, "templateId": 31}'
+# ---
+# name: TestSendMagicLink.test_send_magic_link[PROD-0][send_magic_link_payload]
+  '{"sender": {"name": "La Communaut\\u00e9", "email": "noreply@inclusion.beta.gouv.fr"}, "to": [{"email": "samuel@jackson.com"}], "params": {"display_name": "Samuel J.", "login_link": "LOGIN_LINK"}, "templateId": 31}'
 # ---
diff --git a/lacommunaute/users/tests/tests_views.py b/lacommunaute/users/tests/tests_views.py
index da118e772..eadf32948 100644
--- a/lacommunaute/users/tests/tests_views.py
+++ b/lacommunaute/users/tests/tests_views.py
@@ -7,6 +7,10 @@
 import respx
 from django.conf import settings
 from django.contrib.auth.tokens import default_token_generator
+from django.contrib.messages.api import get_messages
+from django.contrib.messages.middleware import MessageMiddleware
+from django.contrib.sessions.middleware import SessionMiddleware
+from django.test import RequestFactory, override_settings
 from django.urls import reverse
 from django.utils.encoding import force_bytes
 from django.utils.http import urlsafe_base64_encode
@@ -17,6 +21,7 @@
 from lacommunaute.users.factories import UserFactory
 from lacommunaute.users.models import User
 from lacommunaute.users.views import send_magic_link
+from lacommunaute.utils.enums import Environment
 from lacommunaute.utils.testing import parse_response_to_soup
 from lacommunaute.utils.urls import clean_next_url
 
@@ -79,21 +84,31 @@ def validate_magiclink_payload(payload_as_str, uidb64, token, expected):
 
 
 class TestSendMagicLink:
-    def test_send_magic_link(self, db, snapshot, mock_respx_post_to_sib_smtp_url):
-        user = UserFactory(first_name="Edith", last_name="Martin", email="edith@martin.co")
-        next_url = "/topics/"
-        send_magic_link(user, next_url)
-
-        token = default_token_generator.make_token(user)
-        uidb64 = urlsafe_base64_encode(force_bytes(user.pk))
-        url = reverse("users:login_with_link", kwargs={"uidb64": uidb64, "token": token})
-        query_params = urlencode({"next": clean_next_url(next_url)})
-        login_link = f"{settings.COMMU_PROTOCOL}://{settings.COMMU_FQDN}{url}?{query_params}"
-
-        payload_as_str = respx.calls[0].request.content.decode()
-        payload = json.loads(payload_as_str)
-        assert payload["params"]["login_link"] == login_link
-        assert payload_as_str.replace(login_link, "LOGIN_LINK") == snapshot(name="send_magic_link_payload")
+    @pytest.mark.parametrize("env,count_msg", [(Environment.PROD, 0), (Environment.DEV, 1)])
+    def test_send_magic_link(self, db, user, snapshot, mock_respx_post_to_sib_smtp_url, env, count_msg):
+        with override_settings(ENVIRONMENT=env):
+            next_url = "/topics/"
+            request = RequestFactory().get("/")
+            SessionMiddleware(lambda request: None).process_request(request)
+            MessageMiddleware(lambda request: None).process_request(request)
+            send_magic_link(request, user, next_url)
+
+            token = default_token_generator.make_token(user)
+            uidb64 = urlsafe_base64_encode(force_bytes(user.pk))
+            url = reverse("users:login_with_link", kwargs={"uidb64": uidb64, "token": token})
+            query_params = urlencode({"next": clean_next_url(next_url)})
+            login_link = f"{settings.COMMU_PROTOCOL}://{settings.COMMU_FQDN}{url}?{query_params}"
+
+            payload_as_str = respx.calls[0].request.content.decode()
+            payload = json.loads(payload_as_str)
+            assert payload["params"]["login_link"] == login_link
+            assert payload_as_str.replace(login_link, "LOGIN_LINK") == snapshot(name="send_magic_link_payload")
+
+            # we want messages do not appear in the productive environment
+            msgs = get_messages(request)
+            assert len(msgs._queued_messages) == count_msg
+            if msgs._queued_messages:
+                assert str(msgs._queued_messages[0]) == f'<a href="{login_link}">{login_link}</a> sent to {user.email}'
 
 
 class TestLoginView:
@@ -105,6 +120,7 @@ def test_content(self, client, db, next_url, snapshot):
         content = parse_response_to_soup(response, selector="main")
         assert str(content) == snapshot(name="login_view_content")
 
+    @override_settings(ENVIRONMENT=Environment.PROD)
     @pytest.mark.parametrize("next_url,expected", next_url_tuples)
     def test_post(
         self,
@@ -152,6 +168,7 @@ def test_user_is_already_authenticated(self, client, db, next_url, expected):
 
 
 class TestCreateUserView:
+    @override_settings(ENVIRONMENT=Environment.PROD)
     @pytest.mark.parametrize("next_url,expected", next_url_tuples)
     def test_post_new_email(
         self, client, db, next_url, expected, snapshot, mock_token_generator, mock_respx_post_to_sib_smtp_url
@@ -178,6 +195,7 @@ def test_post_new_email(
         payload_as_str = respx.calls[0].request.content.decode()
         assert validate_magiclink_payload(payload_as_str, uidb64, token, expected)
 
+    @override_settings(ENVIRONMENT=Environment.PROD)
     @pytest.mark.parametrize("next_url,expected", next_url_tuples)
     def test_post_existing_email(
         self, client, db, user, next_url, expected, snapshot, mock_token_generator, mock_respx_post_to_sib_smtp_url
diff --git a/lacommunaute/users/views.py b/lacommunaute/users/views.py
index 5f0151e1f..a8af72a7c 100644
--- a/lacommunaute/users/views.py
+++ b/lacommunaute/users/views.py
@@ -2,12 +2,14 @@
 from urllib.parse import urlencode
 
 from django.conf import settings
+from django.contrib import messages
 from django.contrib.auth import login, logout
 from django.contrib.auth.tokens import default_token_generator
 from django.http import HttpResponseRedirect
 from django.shortcuts import redirect, render
 from django.urls import reverse
 from django.utils.encoding import force_bytes, force_str
+from django.utils.html import format_html
 from django.utils.http import urlsafe_base64_decode, urlsafe_base64_encode
 from django.views.generic import FormView
 
@@ -24,7 +26,7 @@
 logger = logging.getLogger(__name__)
 
 
-def send_magic_link(user, next_url):
+def send_magic_link(request, user, next_url):
     token = default_token_generator.make_token(user)
     uidb64 = urlsafe_base64_encode(force_bytes(user.pk))
     url = reverse("users:login_with_link", kwargs={"uidb64": uidb64, "token": token})
@@ -38,6 +40,10 @@ def send_magic_link(user, next_url):
         template_id=settings.SIB_MAGIC_LINK_TEMPLATE,
     )
 
+    if settings.ENVIRONMENT == "DEV":
+        message = format_html('<a href="{0}">{0}</a> sent to {1}', login_link, user.email)
+        messages.success(request, message)
+
 
 class LoginView(FormView):
     template_name = "registration/login_with_magic_link.html"
@@ -62,7 +68,7 @@ def form_valid(self, form):
             query_params = {"email": email, "next": clean_next_url(next_url)}
             return HttpResponseRedirect(f"{base_url}?{urlencode(query_params)}")
 
-        send_magic_link(user, next_url)
+        send_magic_link(self.request, user, next_url)
         return render(self.request, "registration/login_link_sent.html", {"email": email})
 
 
@@ -91,7 +97,7 @@ def form_valid(self, form):
             )
             ForumProfile.objects.create(user=user)
 
-        send_magic_link(user, next_url)
+        send_magic_link(self.request, user, next_url)
         return render(self.request, "registration/login_link_sent.html", {"email": email})
 
 
diff --git a/lacommunaute/utils/enums.py b/lacommunaute/utils/enums.py
index a3f452bb8..8fc3a6dea 100644
--- a/lacommunaute/utils/enums.py
+++ b/lacommunaute/utils/enums.py
@@ -4,3 +4,8 @@
 class PeriodAggregation(models.TextChoices):
     MONTH = "MONTH"
     WEEK = "WEEK"
+
+
+class Environment(models.TextChoices):
+    DEV = "DEV"
+    PROD = "PROD"
diff --git a/lacommunaute/utils/settings_context_processors.py b/lacommunaute/utils/settings_context_processors.py
index 9469a4a09..7427c13d4 100644
--- a/lacommunaute/utils/settings_context_processors.py
+++ b/lacommunaute/utils/settings_context_processors.py
@@ -12,4 +12,5 @@ def expose_settings(request):
         "BASE_TEMPLATE": base_template,
         "MATOMO_SITE_ID": settings.MATOMO_SITE_ID,
         "MATOMO_BASE_URL": settings.MATOMO_BASE_URL,
+        "ENVIRONMENT": settings.ENVIRONMENT,
     }
diff --git a/lacommunaute/utils/tests/tests_middleware.py b/lacommunaute/utils/tests/tests_middleware.py
index 40573b400..5313ce39a 100644
--- a/lacommunaute/utils/tests/tests_middleware.py
+++ b/lacommunaute/utils/tests/tests_middleware.py
@@ -1,5 +1,8 @@
+import pytest
 from django.test import TestCase, override_settings
 
+from lacommunaute.utils.enums import Environment
+
 
 class ParkingMiddlewareTest(TestCase):
     @override_settings(PARKING_PAGE=True)
@@ -13,3 +16,17 @@ def test_no_parking_page_middleware(self):
         response = self.client.get("/")
         self.assertEqual(response.status_code, 200)
         self.assertTemplateUsed(response, "pages/home.html")
+
+
+class TestEnvironmentSettingsMiddleware:
+    @pytest.mark.parametrize(
+        "env,expected",
+        [
+            (Environment.PROD, False),
+            (Environment.DEV, True),
+        ],
+    )
+    def test_prod_environment(self, client, db, env, expected):
+        with override_settings(ENVIRONMENT=env):
+            response = client.get("/")
+        assert ('id="debug-mode-banner"' in response.content.decode()) == expected
diff --git a/lacommunaute/utils/tests/tests_urls.py b/lacommunaute/utils/tests/tests_urls.py
index 51e7af78f..b58c984d7 100644
--- a/lacommunaute/utils/tests/tests_urls.py
+++ b/lacommunaute/utils/tests/tests_urls.py
@@ -13,15 +13,8 @@ def _clear_url_caches():
     sys.modules.pop("config.urls", None)
 
 
-def test_django_urls_dev(settings):
-    settings.DEBUG = True
-    assert reverse("login") == "/login/"
-
-
 def test_django_urls_prod(settings):
     settings.DEBUG = False
-    with pytest.raises(NoReverseMatch):
-        reverse("login")
     with pytest.raises(NoReverseMatch):
         reverse("djdt:render_panel")