diff --git a/app/handler/dmarc.py b/app/handler/dmarc.py
index 24e39550..8ba6d0a9 100644
--- a/app/handler/dmarc.py
+++ b/app/handler/dmarc.py
@@ -1,6 +1,6 @@
 import uuid
 from io import BytesIO
-from typing import Optional, Tuple, Union
+from typing import Optional, Tuple
 
 from aiosmtpd.handlers import Message
 from aiosmtpd.smtp import Envelope