Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/265
The character is a non-breaking space (\xa0) which is not being correctly
handled by the archiver. It then gets substituted by the standard error
replacement character which is what you are seeing.
However mod_mbox handles this OK [1], as does import-mbox when I tried
re-importing the mbox files locally.
Most of the code is the same, except for the way they read the input for
parsing.
Looks like there is an issue with the way the archiver handles standard
input.
[1]
http://mail-archives.apache.org/mod_mbox/johnzon-dev/201611.mbox/%3C1479940647.31291.1.camel%40apache.org%3E
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