What ho, Ken!
Obvious no standard defines this [x-unix-mode] MIME parameter. We
don't do anything with this parameter upon receipt. I don't actually
know which MUAs process such a parameter. It looks like maybe an old
version of Apple Mail might have SENT such a parameter, but I don't
know if would ever do anything with it.
Do you know about Debian Code Search?
http://codesearch.debian.net/search?q=x-unix-mode. Various packages
mention it, the top hit for me is a comment,
We use the x-unix-mode convention from "dtmail 1.2.1 SunOS 5.6".
I didn't find any web page defining it but did see that dtmail is now
available with the source-release of CDE.
http://sourceforge.net/p/cdesktopenv/code/ci/master/tree/ Don't know if
that has clues. It isn't in Debian Code Search AFAICS.
Cheers, Ralph.
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