diff --git a/modoboa/core/api/v2/tests.py b/modoboa/core/api/v2/tests.py
index 39e5f6267..50b208106 100644
--- a/modoboa/core/api/v2/tests.py
+++ b/modoboa/core/api/v2/tests.py
@@ -558,7 +558,7 @@ class ThemeAPITestCase(ModoAPITestCase):
         response = self.client.get(url)
         self.assertEqual(response.status_code, 200)
         theme = response.json()
-        self.assertEqual(theme["theme_primary_color"], "#FF00000")
+        self.assertEqual(theme["theme_primary_color"], "#FF0000")
 
 
 class NewsFeedAPIViewTestCase(ModoAPITestCase):
diff --git a/modoboa/webmail/lib/sendmail.py b/modoboa/webmail/lib/sendmail.py
index c547204d0..e80995d22 100644
--- a/modoboa/webmail/lib/sendmail.py
+++ b/modoboa/webmail/lib/sendmail.py
@@ -134,7 +134,7 @@ def send_mail(request, attributes: dict, attachments: list) -> tuple[bool, str |
                 {
                     "backend": "modoboa.lib.smtp_backend.OAuthBearerEmailBackend",
                     "username": request.user.email,
-                    "password": request.auth,
+                    "password": str(request.auth),
                 }
             )
         else: