Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/84
That won't help, because the TZ which was used for the date field is not
included in the string (if it were, this would be a non-issue).
Also the TZ used to load the original mails is not the same as the TZ which
is used now.
Unless one knows the TZ one cannot tell ES what offset to use.
I think the code should use the epoch instead.
Hopefully that always used UTC, but that needs to be checked.
However there remains the issue that the date fields in the mbox records
use different TZs depending on when they were created. One solution might be to
ignore them completely.
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