While testing this patch, it seems that there is still a condition where
movemail wipes the mailbox (though it doesn't leak contents any more).

Here is an updated reproducer that tests for the conditions...

** Attachment added: "CVE-2010-0825.sh"
   http://launchpadlibrarian.net/41879562/CVE-2010-0825.sh

-- 
Emacs movemail race condition
https://bugs.launchpad.net/bugs/531569
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