diff --git a/hc/accounts/tests/test_login.py b/hc/accounts/tests/test_login.py
index 779d629a..649e185c 100644
--- a/hc/accounts/tests/test_login.py
+++ b/hc/accounts/tests/test_login.py
@@ -2,6 +2,7 @@ from django.contrib.auth.models import User
 from django.core import mail
 from django.test import TestCase
 from django.test.utils import override_settings
+from hc.accounts.models import Profile
 from hc.api.models import Check
 from django.conf import settings
 
@@ -66,3 +67,18 @@ class LoginTestCase(TestCase):
         r = self.client.post("/accounts/login/", form)
         assert r.status_code == 200
         self.assertContains(r, "Incorrect email")
+
+    def test_it_ignores_ces(self):
+        alice = User(username="alice", email="alice@example.org")
+        alice.save()
+
+        form = {"email": "ALICE@EXAMPLE.ORG"}
+
+        r = self.client.post("/accounts/login/", form)
+        assert r.status_code == 302
+
+        # There should be exactly one user:
+        self.assertEqual(User.objects.count(), 1)
+
+        profile = Profile.objects.for_user(alice)
+        self.assertIn("login", profile.token)