1 files changed, 3 insertions, 4 deletions

diff --git a/src/mailman/mta/base.py b/src/mailman/mta/base.py
index 8068eaec1..e11c37ff6 100644
--- a/src/mailman/mta/base.py
+++ b/src/mailman/mta/base.py
@@ -17,7 +17,7 @@
 
 """Base delivery class."""
 
-from __future__ import absolute_import, unicode_literals
+from __future__ import absolute_import, print_function, unicode_literals
 
 __metaclass__ = type
 __all__ = [
@@ -31,7 +31,7 @@ import socket
 import logging
 import smtplib
 
-from zope.interface import implements
+from zope.interface import implementer
 
 from mailman.config import config
 from mailman.interfaces.mta import IMailTransportAgentDelivery
@@ -42,11 +42,10 @@ log = logging.getLogger('mailman.smtp')
 
 
 
+@implementer(IMailTransportAgentDelivery)
 class BaseDelivery:
     """Base delivery class."""
 
-    implements(IMailTransportAgentDelivery)
-
     def __init__(self):
         """Create a basic deliverer."""
         username = (config.mta.smtp_user if config.mta.smtp_user else None)