diff --git a/src/backend/mailbox_manager/utils/dimail.py b/src/backend/mailbox_manager/utils/dimail.py
index 07bbb4610..1a21aadff 100644
--- a/src/backend/mailbox_manager/utils/dimail.py
+++ b/src/backend/mailbox_manager/utils/dimail.py
@@ -84,7 +84,7 @@ def send_mailbox_request(self, mailbox):
                 mailbox.domain.name,
                 extra=extra,
             )
-        elif response.status_code == 403:
+        elif response.status_code == status.HTTP_403_FORBIDDEN:
             logger.error(
                 "[DIMAIL] 403 Forbidden: please check the mail domain secret of %s",
                 mailbox.domain.name,