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I'm running into a problem with imaplib where it is unable to download a
message. The example code at
http://www.python.org/doc/current/lib/imap4-example.html easily
demonstrates the problem. 
#!/usr/bin/python
import getpass, imaplib
M = imaplib.IMAP4("my.imap.host.tld")
M.login(getpass.getuser(), getpass.getpass())
M.debug = 5
M.select("msg-test")
typ, data = M.search(None, 'ALL')
for num in data[0].split():
 typ, data = M.fetch(num, '(RFC822)')
 print 'Message %s\n%s\n' % (num, data[0][1])
M.close()
M.logout()
The majority of the messages transfer correctly, but some do not. I've
put 3 messages in the 'msg-test' folder, and one of them causes the
error below. 
Traceback (most recent call last):
 File "test.py", line 9, in <module>
 typ, data = M.fetch(num, '(RFC822)')
 File "/usr/lib/python2.5/imaplib.py", line 437, in fetch
 typ, dat = self._simple_command(name, message_set, message_parts)
 File "/usr/lib/python2.5/imaplib.py", line 1055, in _simple_command
 return self._command_complete(name, self._command(name, *args))
 File "/usr/lib/python2.5/imaplib.py", line 887, in _command_complete
 raise self.abort('command: %s => %s' % (name, val))
imaplib.abort: command: FETCH => unexpected response: ')'
imaplib.py has a comment in _get_tagged_response:
 # Some have reported "unexpected response" exceptions.
 # Note that ignoring them here causes loops.
 # Instead, send me details of the unexpected response and
 # I'll update the code in `_get_response()'.
I can not provide access to the imap host, but I can help debug wherever
possible. 
The most recent log messages are in the file attachment.