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diff --git a/src/mailman/Bouncers/Netscape.py b/src/mailman/Bouncers/Netscape.py
new file mode 100644
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+++ b/src/mailman/Bouncers/Netscape.py
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+# Copyright (C) 1998-2009 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/>.
+
+"""Netscape Messaging Server bounce formats.
+
+I've seen at least one NMS server version 3.6 (envy.gmp.usyd.edu.au) bounce
+messages of this format.  Bounces come in DSN MIME format, but don't include
+any -Recipient: headers.  Gotta just parse the text :(
+
+NMS 4.1 (dfw-smtpin1.email.verio.net) seems even worse, but we'll try to
+decipher the format here too.
+
+"""
+
+import re
+from cStringIO import StringIO
+
+pcre = re.compile(
+    r'This Message was undeliverable due to the following reason:',
+    re.IGNORECASE)
+
+acre = re.compile(
+    r'(?P<reply>please reply to)?.*<(?P<addr>[^>]*)>',
+    re.IGNORECASE)
+
+
+
+def flatten(msg, leaves):
+    # give us all the leaf (non-multipart) subparts
+    if msg.is_multipart():
+        for part in msg.get_payload():
+            flatten(part, leaves)
+    else:
+        leaves.append(msg)
+
+
+
+def process(msg):
+    # Sigh.  Some show NMS 3.6's show
+    #     multipart/report; report-type=delivery-status
+    # and some show
+    #     multipart/mixed;
+    if not msg.is_multipart():
+        return None
+    # We're looking for a text/plain subpart occuring before a
+    # message/delivery-status subpart.
+    plainmsg = None
+    leaves = []
+    flatten(msg, leaves)
+    for i, subpart in zip(range(len(leaves)-1), leaves):
+        if subpart.get_content_type() == 'text/plain':
+            plainmsg = subpart
+            break
+    if not plainmsg:
+        return None
+    # Total guesswork, based on captured examples...
+    body = StringIO(plainmsg.get_payload())
+    addrs = []
+    while 1:
+        line = body.readline()
+        if not line:
+            break
+        mo = pcre.search(line)
+        if mo:
+            # We found a bounce section, but I have no idea what the official
+            # format inside here is.  :(  We'll just search for <addr>
+            # strings.
+            while 1:
+                line = body.readline()
+                if not line:
+                    break
+                mo = acre.search(line)
+                if mo and not mo.group('reply'):
+                    addrs.append(mo.group('addr'))
+    return addrs