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diff --git a/mailman/rules/max_size.py b/mailman/rules/max_size.py
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+++ b/mailman/rules/max_size.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 maximum message size rule."""
+
+__all__ = ['MaximumSize']
+__metaclass__ = type
+
+
+from zope.interface import implements
+
+from mailman.i18n import _
+from mailman.interfaces import IRule
+
+
+
+class MaximumSize:
+    """The implicit destination rule."""
+    implements(IRule)
+
+    name = 'max-size'
+    description = _('Catch messages that are bigger than a specified maximum.')
+    record = True
+
+    def check(self, mlist, msg, msgdata):
+        """See `IRule`."""
+        if mlist.max_message_size == 0:
+            return False
+        assert hasattr(msg, 'original_size'), (
+            'Message was not sized on initial parsing.')
+        # The maximum size is specified in 1024 bytes.
+        return msg.original_size / 1024.0 > mlist.max_message_size