diff --git a/milters/comment_email_milter.py b/milters/comment_email_milter.py
index 10b62d0..73a3878 100644
--- a/milters/comment_email_milter.py
+++ b/milters/comment_email_milter.py
@@ -19,7 +19,6 @@ import Milter
 import requests
 
 from Milter.utils import parse_addr
-from sqlalchemy.exc import SQLAlchemyError
 
 logq = Queue(maxsize=4)