[issue17064] Fix sporadic buildbot failures for test_mailbox

[R. David Murray]

R. David Murray added the comment:

Thanks, Jeremy.

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resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed
type:  -> behavior
versions: +Python 2.7, Python 3.2 -Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17064>
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