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diff --git a/src/mailman/Bouncers/Yale.py b/src/mailman/Bouncers/Yale.py
new file mode 100644
index 000000000..956dfb838
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+++ b/src/mailman/Bouncers/Yale.py
@@ -0,0 +1,80 @@
+# Copyright (C) 2000-2009 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/>.
+
+"""Yale's mail server is pretty dumb.
+
+Its reports include the end user's name, but not the full domain.  I think we
+can usually guess it right anyway.  This is completely based on examination of
+the corpse, and is subject to failure whenever Yale even slightly changes
+their MTA. :(
+
+"""
+
+import re
+from cStringIO import StringIO
+from email.Utils import getaddresses
+
+scre = re.compile(r'Message not delivered to the following', re.IGNORECASE)
+ecre = re.compile(r'Error Detail', re.IGNORECASE)
+acre = re.compile(r'\s+(?P<addr>\S+)\s+')
+
+
+
+def process(msg):
+    if msg.is_multipart():
+        return None
+    try:
+        whofrom = getaddresses([msg.get('from', '')])[0][1]
+        if not whofrom:
+            return None
+        username, domain = whofrom.split('@', 1)
+    except (IndexError, ValueError):
+        return None
+    if username.lower() <> 'mailer-daemon':
+        return None
+    parts = domain.split('.')
+    parts.reverse()
+    for part1, part2 in zip(parts, ('edu', 'yale')):
+        if part1 <> part2:
+            return None
+    # Okay, we've established that the bounce came from the mailer-daemon at
+    # yale.edu.  Let's look for a name, and then guess the relevant domains.
+    names = {}
+    body = StringIO(msg.get_payload())
+    state = 0
+    # simple state machine
+    #     0 == init
+    #     1 == intro found
+    while 1:
+        line = body.readline()
+        if not line:
+            break
+        if state == 0 and scre.search(line):
+            state = 1
+        elif state == 1 and ecre.search(line):
+            break
+        elif state == 1:
+            mo = acre.search(line)
+            if mo:
+                names[mo.group('addr')] = 1
+    # Now we have a bunch of names, these are either @yale.edu or
+    # @cs.yale.edu.  Add them both.
+    addrs = []
+    for name in names.keys():
+        addrs.append(name + '@yale.edu')
+        addrs.append(name + '@cs.yale.edu')
+    return addrs