R. David Murray <rdmur...@bitdance.com> added the comment:

The pre 3.3 email package does not do any header unfolding.  You can make this 
work by doing the header unfolding before passing it to getaddresses:

  >>> email.utils.getaddresses([''.join(m['to'].splitlines())])
  [('A (B)', 'c...@d.org'), ('', 'd...@e.org')]

The new provisional policy that was just added to 3.3 (which will eventually 
become the standard interface) does do the unfolding before parsing the 
addresses, so it does not have this issue.  In 3.3 we now have this:

  >>> import email
  >>> from email.policy import SMTP
  >>> m = email.message_from_string("To: \"A\r\n (B)\" <c...@d.org>, (A\r\n C) 
<d...@e.org>\r\nSubject: test\r\n\r\nbody", policy=SMTP)
  >>> m['to'].addresses
  (Address(display_name='A (B)', username='c', domain='d.org'), 
Address(display_name='', username='d', domain='e.org'))

----------
resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11050>
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