[issue17064] Fix sporadic buildbot failures for test_mailbox

[Jeremy Kloth]

Jeremy Kloth added the comment:

Actually, the support functions (as of 3.3) attempt to work around the access errors.  They attempt to wait (to a point) for a successful operation before returning to the caller.  See issue15496 for details.

It is usually the case that the previous operation has not yet finished as to the cause of the access error.

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