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-rw-r--r--src/mailman/model/messagestore.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mailman/model/messagestore.py b/src/mailman/model/messagestore.py
index 41c2ad8d8..3b8aed9c5 100644
--- a/src/mailman/model/messagestore.py
+++ b/src/mailman/model/messagestore.py
@@ -58,7 +58,7 @@ class MessageStore:
raise ValueError('Exactly one Message-ID header required')
# Calculate and insert the X-Message-ID-Hash.
message_id = message_ids[0]
- if not isinstance(message_id, unicode):
+ if isinstance(message_id, bytes):
message_id = message_id.decode("ascii")
# Complain if the Message-ID already exists in the storage.
existing = store.query(Message).filter(