diff --git a/src/backend/plugins/organizations.py b/src/backend/plugins/organizations.py
index 634b5b5..c8ca8a2 100644
--- a/src/backend/plugins/organizations.py
+++ b/src/backend/plugins/organizations.py
@@ -139,14 +139,21 @@ class CommuneCreation(BaseOrganizationPlugin):
         create_domain.params = {
             "name": inputs["name"],
             "delivery": "virtual",
-            "features": ["webmail"],
+            "features": ["webmail","mailbox"],
             "context_name": inputs["name"],
         }
         create_domain.headers = {
             "Authorization": f"Basic: {settings.MAIL_PROVISIONING_API_CREDENTIALS}"
         }
 
-        return [create_zone, create_domain]
+        spec_domain = ApiCall()
+        spec_domain.base = settings.MAIL_PROVISIONING_API_URL
+        spec_domain.url = f"/domains/{inputs["name"]}.collectivite.fr/spec"
+        spec_domain.headers = {
+            "Authorization": f"Basic: {settings.MAIL_PROVISIONING_API_CREDENTIALS}"
+        }
+
+        return [create_zone, create_domain, spec_domain]
 
     def run_after_create(self, organization):
         """After creating an organization, update the organization name."""
diff --git a/src/backend/plugins/tests/organizations/test_commune_creation.py b/src/backend/plugins/tests/organizations/test_commune_creation.py
index e0fd65f..8662043 100644
--- a/src/backend/plugins/tests/organizations/test_commune_creation.py
+++ b/src/backend/plugins/tests/organizations/test_commune_creation.py
@@ -90,10 +90,25 @@ def test_tasks_on_commune_creation_include_dimail_domain_creation():
     assert tasks[1].params == {
         "name": "merlaut",
         "delivery": "virtual",
-        "features": ["webmail"],
+        "features": ["webmail", "mailbox"],
         "context_name": "merlaut",
     }
     assert (
         tasks[1].headers["Authorization"]
         == f"Basic: {settings.MAIL_PROVISIONING_API_CREDENTIALS}"
     )
+
+def test_tasks_on_commune_creation_include_fetching_spec():
+    """Test the third task in commune creation: asking Dimail for the spec"""
+    plugin = CommuneCreation()
+    name = "Loc-Eguiner"
+
+    tasks = plugin.complete_commune_creation(name)
+
+    assert tasks[2].base == settings.MAIL_PROVISIONING_API_URL
+    assert tasks[2].url == "/domains/loc-eguiner.collectivite.fr/spec"
+    assert tasks[2].method == "GET"
+    assert (
+        tasks[2].headers["Authorization"]
+        == f"Basic: {settings.MAIL_PROVISIONING_API_CREDENTIALS}"
+    )