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

[Petri Lehtinen]

Petri Lehtinen <petri at digip.org> added the comment:

See #15122 for always modifying single-file mailboxes in-place.

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