Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/84
I also found a non-uploaded mail that has been allocated to the wrong month:
https://lists.apache.org/thread.html/79e2e6a0df70efc206e8e0124bd52d0302c52b50775d5aaa2cff108d@1464733997@%3Cuser.commons.apache.org%3E
The date in the email is
Date: Tue, 31 May 2016 22:33:17 +0000
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