[issue9559] mailbox.mbox creates new file when adding message to mbox

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


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nosy: +akuchling
versions: +Python 3.1, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9559>
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