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-rw-r--r--Mailman/Message.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Mailman/Message.py b/Mailman/Message.py
index 45af67184..11e2f8c0a 100644
--- a/Mailman/Message.py
+++ b/Mailman/Message.py
@@ -94,7 +94,7 @@ class UserNotification(Message):
subject = '(no subject)'
self['Subject'] = subject
self['From'] = sender
- if type(recip) == ListType:
+ if isinstance(recip, ListType):
self['To'] = COMMASPACE.join(recip)
self.recips = recip
else: