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diff --git a/src/mailman/pipelines/base.py b/src/mailman/pipelines/base.py
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+# Copyright (C) 2006-2017 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/>.
+
+"""Base class for pipelines.."""
+
+from mailman.config import config
+from mailman.interfaces.pipeline import IPipeline
+from mailman.utilities.modules import abstract_component
+from public import public
+from zope.interface import implementer
+
+
+@public
+@abstract_component
+@implementer(IPipeline)
+class BasePipeline:
+    """Base pipeline implementation."""
+
+    _default_handlers = ()
+
+    def __init__(self):
+        self._handlers = []
+        for handler_name in self._default_handlers:
+            self._handlers.append(config.handlers[handler_name])
+
+    def __iter__(self):
+        """See `IPipeline`."""
+        yield from self._handlers