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diff --git a/src/mailman/interfaces/handler.py b/src/mailman/interfaces/handler.py
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+++ b/src/mailman/interfaces/handler.py
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+# Copyright (C) 2008-2009 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 describing a pipeline handler."""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'IHandler',
+    ]
+
+
+from zope.interface import Interface, Attribute
+
+
+
+class IHandler(Interface):
+    """A basic pipeline handler."""
+
+    name = Attribute('Handler name; must be unique.')
+
+    description = Attribute('A brief description of the handler.')
+
+    def process(mlist, msg, msgdata):
+        """Run the handler.
+
+        :param mlist: The mailing list object.
+        :param msg: The message object.
+        :param msgdata: The message metadata.
+        """