Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/212
Emails that are processed live by the archiver will not have escaped From
lines.
This is correct; the emails will be stored as-is in the database.
However the same e-mail imported from an mbox file will have escaped lines,
i.e. the database copy will be escaped.
Since the escaping affects the body content, this means that fixing this is
likely to affect ids and Permalinks.
Taken together with #188, this means it's currently impossible to export
and re-import such mails properly.
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