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diff --git a/src/mailman/interfaces/bounce.py b/src/mailman/interfaces/bounce.py
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+++ b/src/mailman/interfaces/bounce.py
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+# Copyright (C) 2010 by the Free Software Foundation, Inc.
+#
+# This file is part of GNU Mailman.
+#
+# GNU Mailman is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Interface to bounce detection components."""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'IBounceDetector',
+    'Stop',
+    ]
+
+
+from zope.interface import Interface
+
+
+
+# Matching addresses were found, but they were determined to be non-fatal.  In
+# this case, processing is halted but no bounces are registered.
+NonFatal = object()
+
+
+
+class IBounceDetector(Interface):
+    """Detect a bounce in an email message."""
+
+    def process(self, msg):
+        """Scan an email message looking for bounce addresses.
+
+        :param msg: An email message.
+        :type msg: `Message`
+        :return: The detected bouncing addresses.  When bouncing addresses are
+            found but are determined to be non-fatal, the special marker
+            `NonFatal` can be returned to halt any bounce processing
+            pipeline.  None can be returned if no addresses are found.
+        :rtype: A sequence of strings, None, or NonFatal.
+        """