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-rw-r--r--mailman/pipeline/avoid_duplicates.py6
1 files changed, 5 insertions, 1 deletions
diff --git a/mailman/pipeline/avoid_duplicates.py b/mailman/pipeline/avoid_duplicates.py
index 10c047004..0458e117c 100644
--- a/mailman/pipeline/avoid_duplicates.py
+++ b/mailman/pipeline/avoid_duplicates.py
@@ -23,8 +23,12 @@ has already received a copy, we either drop the message, add a duplicate
warning header, or pass it through, depending on the user's preferences.
"""
+from __future__ import absolute_import, unicode_literals
+
__metaclass__ = type
-__all__ = ['AvoidDuplicates']
+__all__ = [
+ 'AvoidDuplicates',
+ ]
from email.Utils import getaddresses, formataddr