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