Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/317
A sample mail with no subject is here:
https://lists.apache.org/[email protected]:dfr=2016-10-1|dto=2016-10-31:no+subject
This cannot be viewed except in Social theme, even then it's not possible
to view the Permalink; only the Atom feed works. That problem has been fixed in
0.10.
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