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diff --git a/src/mailman/mta/null.py b/src/mailman/mta/null.py
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+# Copyright (C) 2001-2009 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/>.
+
+"""Creation/deletion hooks for the MTAs that do things automatically.
+
+Exim one example of an MTA that Just Works.
+"""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'NullMTA',
+    ]
+
+
+from zope.interface import implements
+from mailman.interfaces.mta import IMailTransportAgent
+
+
+
+class NullMTA:
+    """Null MTA that just satisfies the interface."""
+
+    implements(IMailTransportAgent)
+
+    def create(self, mlist):
+        """See `IMailTransportAgent`."""
+        pass
+
+    def delete(self, mlist):
+        """See `IMailTransportAgent`."""
+        pass
+
+    def regenerate(self):
+        """See `IMailTransportAgent`."""
+        pass