diff --git a/core/admin/mailu/configuration.py b/core/admin/mailu/configuration.py
index fdcf4819..66a097b2 100644
--- a/core/admin/mailu/configuration.py
+++ b/core/admin/mailu/configuration.py
@@ -58,6 +58,8 @@ DEFAULT_CONFIG = {
     'OIDC_CHANGE_PASSWORD_REDIRECT_ENABLED': True,
     'OIDC_CHANGE_PASSWORD_REDIRECT_URL': None,
     'OIDC_REDIRECT_URL': None,
+    'OIDC_USERNAME_CLAIM': 'email',
+    'OIDC_USER_DOMAIN': None,
     # Mail settings
     'DMARC_RUA': None,
     'DMARC_RUF': None,