[Mailman-Developers] Fwd: Bounce action notification

[M.-A. Lemburg]

M.-A. Lemburg wrote:
> I guess some simple email address mangling trick would give you
> the same effect, e.g. base64 encoding:
> 
>  >>> print 'mm(' + base64.encodestring('mal at lemburg.com') + ')'
> mm(bWFsQGxlbWJ1cmcuY29t)
> 
> These kind of encodings could even be used in URLs and survive
> text->HTML->text conversion.

Here's some code and an example:

import base64, re

def encode_email_address(address, note=''):
     encoded = base64.encodestring(address + ' ' + note)[:-1]
     encoded = encoded.replace('=', '-')
     encoded = encoded.replace('+', '.')
     encoded = encoded.replace('/', '_')
     return 'mm(%s)' % encoded

def decode_email_address_part(mangled_address):
     mangled_address = mangled_address.replace('-', '=')
     mangled_address = mangled_address.replace('.', '+')
     mangled_address = mangled_address.replace('_', '/')
     decoded = base64.decodestring(mangled_address)
     return decoded.split()

message = """
From: postmaster at lemburg.com
Date: Tue Feb 25, 2003  12:58:07  AM US/Pacific
To: list-bounce at lists.egenix.com
Subject: Bounce action notification

The following message bounced.

    From: mailman at lemburg.com
    To: info at egenix.com
    ...

    _______________________________________________
    %s
    %s
""" % (encode_email_address('mailman at lemburg.com', 'sender'),
        encode_email_address('info at egenix.com', 'rcpt'))

print 'Message:'
print message
print

parser = re.compile('mm\(([0-9a-zA-Z-._]+)\)')

def find_email_addresses(message, start=0, end=None):
     l = []
     if end is None:
         end = len(message)
     while start < end:
         m = parser.search(message, start, end)
         if m is not None:
             address, note = decode_email_address_part(m.group(1))
             l.append((note, address))
             start = m.end()
         else:
             break
     return l

addrs = find_email_addresses(message)
print 'Found these email address in message:'
for addr in addrs:
     print ' ', addr

--

lemburg/tmp> python mangle_email_address.py
Message:

From: postmaster at lemburg.com
Date: Tue Feb 25, 2003  12:58:07  AM US/Pacific
To: list-bounce at lists.egenix.com
Subject: Bounce action notification

The following message bounced.

    From: mailman at lemburg.com
    To: info at egenix.com
    ...

    _______________________________________________
    mm(bWFpbG1hbkBsZW1idXJnLmNvbSBzZW5kZXI-)
    mm(aW5mb0BlZ2VuaXguY29tIHJjcHQ-)


Found these email address in message:
   ('sender', 'mailman at lemburg.com')
   ('rcpt', 'info at egenix.com')

-- 
Marc-Andre Lemburg
eGenix.com

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