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'Release_2_1-maint'.

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diff --git a/Mailman/Bouncers/BouncerAPI.py b/Mailman/Bouncers/BouncerAPI.py
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+# Copyright (C) 1998,1999,2000,2001,2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+"""Contains all the common functionality for msg bounce scanning API.
+
+This module can also be used as the basis for a bounce detection testing
+framework.  When run as a script, it expects two arguments, the listname and
+the filename containing the bounce message.
+
+"""
+
+import sys
+
+from Mailman.Logging.Syslog import syslog
+
+# If a bounce detector returns Stop, that means to just discard the message.
+# An example is warning messages for temporary delivery problems.  These
+# shouldn't trigger a bounce notification, but we also don't want to send them
+# on to the list administrator.
+class _Stop:
+    pass
+Stop = _Stop()
+
+
+BOUNCE_PIPELINE = [
+    'DSN',
+    'Qmail',
+    'Postfix',
+    'Yahoo',
+    'Caiwireless',
+    'Exchange',
+    'Exim',
+    'Netscape',
+    'Compuserve',
+    'Microsoft',
+    'GroupWise',
+    'SMTP32',
+    'SimpleMatch',
+    'SimpleWarning',
+    'Yale',
+    'LLNL',
+    ]
+
+
+
+# msg must be a mimetools.Message
+def ScanMessages(mlist, msg):
+    for module in BOUNCE_PIPELINE:
+        modname = 'Mailman.Bouncers.' + module
+        __import__(modname)
+        addrs = sys.modules[modname].process(msg)
+        if addrs is Stop:
+            # One of the detectors recognized the bounce, but there were no
+            # addresses to extract.  Return the empty list.
+            return []
+        elif addrs:
+            return addrs
+    return []