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-rw-r--r--mailman/interfaces/mta.py8
1 files changed, 7 insertions, 1 deletions
diff --git a/mailman/interfaces/mta.py b/mailman/interfaces/mta.py
index a8f55f961..5e647cfb2 100644
--- a/mailman/interfaces/mta.py
+++ b/mailman/interfaces/mta.py
@@ -17,7 +17,13 @@
"""Interface for mail transport agent integration."""
-from zope.interface import Interface, Attribute
+__metaclass__ = type
+__all__ = [
+ 'IMailTransportAgent',
+ ]
+
+
+from zope.interface import Interface