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diff --git a/mailman/rules/__init__.py b/mailman/rules/__init__.py
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+++ b/mailman/rules/__init__.py
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+# Copyright (C) 2007-2008 by the Free Software Foundation, Inc.
+#
+# This program 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 2
+# of the License, or (at your option) any later version.
+#
+# This program 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 this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+# USA.
+
+"""The built in rule set."""
+
+__metaclass__ = type
+__all__ = ['initialize']
+
+
+import os
+import sys
+
+from mailman.interfaces import IRule
+
+
+
+def initialize():
+    """Initialize the built-in rules.
+
+    Rules are auto-discovered by searching for IRule implementations in all
+    importable modules in this subpackage.
+    """
+    # Find all rules found in all modules inside our package.
+    import mailman.rules
+    here = os.path.dirname(mailman.rules.__file__)
+    for filename in os.listdir(here):
+        basename, extension = os.path.splitext(filename)
+        if extension <> '.py':
+            continue
+        module_name = 'mailman.rules.' + basename
+        __import__(module_name, fromlist='*')
+        module = sys.modules[module_name]
+        for name in module.__all__:
+            rule = getattr(module, name)
+            if IRule.implementedBy(rule):
+                yield rule