handle the case where reply_email is not ascii

email_handler.py

@@ -118,7 +118,7 @@ from app.models import (
 )
 from app.pgp_utils import PGPException, sign_data_with_pgpy, sign_data
 from app.spamassassin_utils import SpamAssassin
-from app.utils import random_string
+from app.utils import random_string, convert_to_id
 from init_app import load_pgp_public_keys
 from server import create_app, create_light_app
 
@@ -790,6 +790,10 @@ def handle_reply(envelope, msg: Message, rcpt_to: str) -> (bool, str):
         LOG.warning(f"Reply email {reply_email} has wrong domain")
         return False, "550 SL E2"
 
+    # handle case where reply email is generated with non-ascii char
+    if not reply_email.isascii():
+        reply_email = convert_to_id(reply_email)
+
     contact = Contact.get_by(reply_email=reply_email)
     if not contact:
         LOG.warning(f"No such forward-email with {reply_email} as reply-email")