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... and that closes the original file, too!
(I've also opened #11700 due to the mailbox.py
side of this.)
static PyObject *
textiowrapper_close(textio *self, PyObject *args)
 return PyObject_CallMethod(self->buffer, "close", NULL);
>>> mb = mailbox.Maildir('sdaoden', create=False)
>>> mbf = mb.get_file(mb.keys()[0])
>>> msg = email.parser.BytesParser().parse(mbf, headersonly=True)
>>> mbf.close()
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/Users/steffen/usr/opt/py3k/lib/python3.3/mailbox.py", line 1922, in close
 if hasattr(self._file, 'close'):
AttributeError: '_ProxyFile' object has no attribute '_file'