diff --git a/backend/routers/auth.py b/backend/routers/auth.py
index bb661d6..da2eacc 100644
--- a/backend/routers/auth.py
+++ b/backend/routers/auth.py
@@ -4,13 +4,14 @@ from __future__ import annotations
 
 from auth import login, logout, require_auth
 from fastapi import APIRouter, Depends, Response
-from pydantic import BaseModel, EmailStr, Field
+from pydantic import BaseModel, Field
 
 router = APIRouter(prefix="/api/auth", tags=["auth"])
 
 
 class LoginRequest(BaseModel):
-    email: EmailStr
+    # str statt EmailStr: Self-Hosted/Dev nutzt oft .local-Domains (admin@kairo.local)
+    email: str = Field(min_length=3, max_length=255)
     password: str = Field(min_length=8, max_length=256)
 
 
diff --git a/backend/tests/factories.py b/backend/tests/factories.py
index 7cda720..42bbcba 100644
--- a/backend/tests/factories.py
+++ b/backend/tests/factories.py
@@ -32,7 +32,7 @@ def create_user(
     display_name: str = "Test User",
     portal_role: str = "user",
 ) -> dict:
-    email = email or f"user-{uuid.uuid4().hex[:8]}@test.local"
+    email = email or f"user-{uuid.uuid4().hex[:8]}@example.com"
     conn = get_connection()
     try:
         with conn.cursor() as cur: