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-rw-r--r--src/mailman/utilities/email.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/mailman/utilities/email.py b/src/mailman/utilities/email.py
index 7025ddb89..ea44ad0a4 100644
--- a/src/mailman/utilities/email.py
+++ b/src/mailman/utilities/email.py
@@ -62,6 +62,8 @@ def add_message_hash(msg):
message_id = msg.get('message-id')
if message_id is None:
return
+ if isinstance(message_id, bytes):
+ message_id = message_id.decode('ascii')
# The angle brackets are not part of the Message-ID. See RFC 2822
# and http://wiki.list.org/display/DEV/Stable+URLs
if message_id.startswith('<') and message_id.endswith('>'):