diff --git a/src/backend/plugins/organizations.py b/src/backend/plugins/organizations.py
index c8ca8a2..9edded6 100644
--- a/src/backend/plugins/organizations.py
+++ b/src/backend/plugins/organizations.py
@@ -137,10 +137,10 @@ class CommuneCreation(BaseOrganizationPlugin):
         create_domain.base = settings.MAIL_PROVISIONING_API_URL
         create_domain.url = "/domains"
         create_domain.params = {
-            "name": inputs["name"],
+            "name": f"{inputs["name"]}.collectivite.fr",
             "delivery": "virtual",
             "features": ["webmail","mailbox"],
-            "context_name": inputs["name"],
+            "context_name": f"{inputs["name"]}.collectivite.fr",
         }
         create_domain.headers = {
             "Authorization": f"Basic: {settings.MAIL_PROVISIONING_API_CREDENTIALS}"
diff --git a/src/backend/plugins/tests/organizations/test_commune_creation.py b/src/backend/plugins/tests/organizations/test_commune_creation.py
index 8662043..afbdf39 100644
--- a/src/backend/plugins/tests/organizations/test_commune_creation.py
+++ b/src/backend/plugins/tests/organizations/test_commune_creation.py
@@ -88,10 +88,10 @@ def test_tasks_on_commune_creation_include_dimail_domain_creation():
     assert tasks[1].url == "/domains"
     assert tasks[1].method == "POST"
     assert tasks[1].params == {
-        "name": "merlaut",
+        "name": "merlaut.collectivite.fr",
         "delivery": "virtual",
         "features": ["webmail", "mailbox"],
-        "context_name": "merlaut",
+        "context_name": "merlaut.collectivite.fr",
     }
     assert (
         tasks[1].headers["Authorization"]