diff --git a/src/backend/demo/defaults.py b/src/backend/demo/defaults.py
index ee82235d..bba66837 100644
--- a/src/backend/demo/defaults.py
+++ b/src/backend/demo/defaults.py
@@ -8,11 +8,19 @@ NB_OBJECTS = {
 
 DEV_USERS = [
     {"username": "impress", "email": "impress@impress.world", "language": "en-us"},
-    {"username": "user-e2e-webkit", "email": "user@webkit.test", "language": "en-us"},
-    {"username": "user-e2e-firefox", "email": "user@firefox.test", "language": "en-us"},
+    {
+        "username": "user-e2e-webkit",
+        "email": "user.test@webkit.test",
+        "language": "en-us",
+    },
+    {
+        "username": "user-e2e-firefox",
+        "email": "user.test@firefox.test",
+        "language": "en-us",
+    },
     {
         "username": "user-e2e-chromium",
-        "email": "user@chromium.test",
+        "email": "user.test@chromium.test",
         "language": "en-us",
     },
 ]
diff --git a/src/backend/demo/management/commands/create_demo.py b/src/backend/demo/management/commands/create_demo.py
index 74c02709..3681c378 100644
--- a/src/backend/demo/management/commands/create_demo.py
+++ b/src/backend/demo/management/commands/create_demo.py
@@ -119,8 +119,8 @@ def create_demo(stdout):
             first_name = random.choice(first_names)
             queue.push(
                 models.User(
-                    admin_email=f"user{i:d}@example.com",
-                    email=f"user{i:d}@example.com",
+                    admin_email=f"user.test{i:d}@example.com",
+                    email=f"user.test{i:d}@example.com",
                     password="!",
                     is_superuser=False,
                     is_active=True,
diff --git a/src/backend/demo/tests/test_commands_create_demo.py b/src/backend/demo/tests/test_commands_create_demo.py
index b997f904..6bd19e11 100644
--- a/src/backend/demo/tests/test_commands_create_demo.py
+++ b/src/backend/demo/tests/test_commands_create_demo.py
@@ -33,9 +33,9 @@ def test_commands_create_demo():
     # assert dev users have doc accesses
     user = models.User.objects.get(email="impress@impress.world")
     assert models.DocumentAccess.objects.filter(user=user).exists()
-    user = models.User.objects.get(email="user@webkit.test")
+    user = models.User.objects.get(email="user.test@webkit.test")
     assert models.DocumentAccess.objects.filter(user=user).exists()
-    user = models.User.objects.get(email="user@firefox.test")
+    user = models.User.objects.get(email="user.test@firefox.test")
     assert models.DocumentAccess.objects.filter(user=user).exists()
-    user = models.User.objects.get(email="user@chromium.test")
+    user = models.User.objects.get(email="user.test@chromium.test")
     assert models.DocumentAccess.objects.filter(user=user).exists()
diff --git a/src/frontend/apps/e2e/__tests__/app-impress/doc-member-create.spec.ts b/src/frontend/apps/e2e/__tests__/app-impress/doc-member-create.spec.ts
index 4d69f772..7c02ab3f 100644
--- a/src/frontend/apps/e2e/__tests__/app-impress/doc-member-create.spec.ts
+++ b/src/frontend/apps/e2e/__tests__/app-impress/doc-member-create.spec.ts
@@ -15,7 +15,7 @@ test.describe('Document create member', () => {
   });
 
   test('it selects 2 users and 1 invitation', async ({ page, browserName }) => {
-    const inputFill = 'user ';
+    const inputFill = 'user.test';
     const responsePromise = page.waitForResponse(
       (response) =>
         response.url().includes(`/users/?q=${encodeURIComponent(inputFill)}`) &&
diff --git a/src/frontend/apps/e2e/__tests__/app-impress/utils-share.ts b/src/frontend/apps/e2e/__tests__/app-impress/utils-share.ts
index f815d379..1d962fee 100644
--- a/src/frontend/apps/e2e/__tests__/app-impress/utils-share.ts
+++ b/src/frontend/apps/e2e/__tests__/app-impress/utils-share.ts
@@ -8,7 +8,7 @@ export const addNewMember = async (
   page: Page,
   index: number,
   role: 'Administrator' | 'Owner' | 'Editor' | 'Reader',
-  fillText: string = 'user ',
+  fillText: string = 'user.test',
 ) => {
   const responsePromiseSearchUser = page.waitForResponse(
     (response) =>