87 lines
2.2 KiB
Python
87 lines
2.2 KiB
Python
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# -*- test-case-name: twisted.mail.test.test_bounce -*-
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#
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# Copyright (c) Twisted Matrix Laboratories.
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# See LICENSE for details.
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"""
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Support for bounce message generation.
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"""
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import StringIO
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import rfc822
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import time
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import os
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from twisted.mail import smtp
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BOUNCE_FORMAT = """\
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From: postmaster@%(failedDomain)s
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To: %(failedFrom)s
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Subject: Returned Mail: see transcript for details
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Message-ID: %(messageID)s
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Content-Type: multipart/report; report-type=delivery-status;
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boundary="%(boundary)s"
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--%(boundary)s
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%(transcript)s
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--%(boundary)s
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Content-Type: message/delivery-status
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Arrival-Date: %(ctime)s
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Final-Recipient: RFC822; %(failedTo)s
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"""
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def generateBounce(message, failedFrom, failedTo, transcript=''):
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"""
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Generate a bounce message for an undeliverable email message.
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@type message: L{bytes}
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@param message: The undeliverable message.
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@type failedFrom: L{bytes}
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@param failedFrom: The originator of the undeliverable message.
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@type failedTo: L{bytes}
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@param failedTo: The destination of the undeliverable message.
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@type transcript: L{bytes}
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@param transcript: An error message to include in the bounce message.
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@rtype: 3-L{tuple} of (E{1}) L{bytes}, (E{2}) L{bytes}, (E{3}) L{bytes}
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@return: The originator, the destination and the contents of the bounce
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message. The destination of the bounce message is the originator of
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the undeliverable message.
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"""
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if not transcript:
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transcript = '''\
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I'm sorry, the following address has permanent errors: %(failedTo)s.
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I've given up, and I will not retry the message again.
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''' % vars()
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boundary = "%s_%s_%s" % (time.time(), os.getpid(), 'XXXXX')
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failedAddress = rfc822.AddressList(failedTo)[0][1]
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failedDomain = failedAddress.split('@', 1)[1]
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messageID = smtp.messageid(uniq='bounce')
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ctime = time.ctime(time.time())
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fp = StringIO.StringIO()
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fp.write(BOUNCE_FORMAT % vars())
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orig = message.tell()
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message.seek(2, 0)
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sz = message.tell()
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message.seek(0, orig)
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if sz > 10000:
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while 1:
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line = message.readline()
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if len(line)<=1:
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break
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fp.write(line)
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else:
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fp.write(message.read())
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return '', failedFrom, fp.getvalue()
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