Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/32
The archiver and importer now both use byte import. This should fix issues
with unicode.
However the unstable MID problem still exists, because the digest is done
after the parsing.
There's no guarantee that the parsed output will be exactly the same for
different versions of the mail software, as headers may have different line
wraps. In theory the parsed body should be the same, except for HTML bodies
which will rely on the html2text formatting. And even non-HTML bodies may vary
as improvements are made to the parsing.
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