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-rw-r--r--src/mailman/utilities/email.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mailman/utilities/email.py b/src/mailman/utilities/email.py
index 7025ddb89..a15c86fb5 100644
--- a/src/mailman/utilities/email.py
+++ b/src/mailman/utilities/email.py
@@ -68,7 +68,7 @@ def add_message_hash(msg):
message_id = message_id[1:-1]
else:
message_id = message_id.strip()
- digest = sha1(message_id).digest()
+ digest = sha1(message_id.encode('utf-8')).digest()
message_id_hash = b32encode(digest)
del msg['x-message-id-hash']
msg['X-Message-ID-Hash'] = message_id_hash