Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/401
It should be easy enough to support the MMDF format which based on a single
file [1]
The import tool does not currently support MMDF format, but that should
easy to implement as it is supported by the Python mail package.
It would be harder to support formats which use a directory structure; the
code would need to package the output files as an archive of some kind (tar,
zip)
[1] http://www.tin.org/bin/man.cgi?section=5&topic=mmdf
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