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+# Copyright (C) 1998-2008 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.
+
+"""Parse bounce messages generated by qmail.
+
+Qmail actually has a standard, called QSBMF (qmail-send bounce message
+format), as described in
+
+ http://cr.yp.to/proto/qsbmf.txt
+
+This module should be conformant.
+
+"""
+
+import re
+import email.Iterators
+
+# Other (non-standard?) intros have been observed in the wild.
+introtags = [
+ 'Hi. This is the',
+ "We're sorry. There's a problem",
+ 'Check your send e-mail address.',
+ 'This is the mail delivery agent at',
+ 'Unfortunately, your mail was not delivered'
+ ]
+acre = re.compile(r'<(?P<addr>[^>]*)>:')
+
+
+
+def process(msg):
+ addrs = []
+ # simple state machine
+ # 0 = nothing seen yet
+ # 1 = intro paragraph seen
+ # 2 = recip paragraphs seen
+ state = 0
+ for line in email.Iterators.body_line_iterator(msg):
+ line = line.strip()
+ if state == 0:
+ for introtag in introtags:
+ if line.startswith(introtag):
+ state = 1
+ break
+ elif state == 1 and not line:
+ # Looking for the end of the intro paragraph
+ state = 2
+ elif state == 2:
+ if line.startswith('-'):
+ # We're looking at the break paragraph, so we're done
+ break
+ # At this point we know we must be looking at a recipient
+ # paragraph
+ mo = acre.match(line)
+ if mo:
+ addrs.append(mo.group('addr'))
+ # Otherwise, it must be a continuation line, so just ignore it
+ # Not looking at anything in particular
+ return addrs