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diff --git a/src/mailman/bouncers/microsoft.py b/src/mailman/bouncers/microsoft.py
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+# Copyright (C) 1998-2010 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/>.
+
+"""Microsoft's `SMTPSVC' nears I kin tell."""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+ 'Microsoft',
+ ]
+
+
+import re
+
+from cStringIO import StringIO
+from flufl.enum import Enum
+from zope.interface import implements
+
+from mailman.interfaces.bounce import IBounceDetector
+
+
+scre = re.compile(r'transcript of session follows', re.IGNORECASE)
+
+
+class ParseState(Enum):
+ start = 0
+ tag_seen = 1
+
+
+
+class Microsoft:
+ """Microsoft's `SMTPSVC' nears I kin tell."""
+
+ def process(self, msg):
+ if msg.get_content_type() != 'multipart/mixed':
+ return None
+ # Find the first subpart, which has no MIME type.
+ try:
+ subpart = msg.get_payload(0)
+ except IndexError:
+ # The message *looked* like a multipart but wasn't.
+ return None
+ data = subpart.get_payload()
+ if isinstance(data, list):
+ # The message is a multi-multipart, so not a matching bounce.
+ return None
+ body = StringIO(data)
+ state = ParseState.start
+ addresses = set()
+ for line in body:
+ if state is ParseState.start:
+ if scre.search(line):
+ state = ParseState.tag_seen
+ elif state is ParseState.tag_seen:
+ if '@' in line:
+ addresses.add(line.strip())
+ return list(addresses)