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-rw-r--r--src/mailman/email/message.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mailman/email/message.py b/src/mailman/email/message.py
index 21bdfd30d..6ddedc48e 100644
--- a/src/mailman/email/message.py
+++ b/src/mailman/email/message.py
@@ -126,7 +126,7 @@ class Message(email.message.Message):
for sender in senders:
if not sender:
continue
- if not isinstance(sender, unicode):
+ if isinstance(sender, bytes):
sender = sender.decode("ascii")
clean_senders.append(sender)
return clean_senders