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Karl Eichwalder <keichwa@gmx.net> writes:

> I also observed that even more users don't set the Mime headers at
> all!  And Gnus assumes UTF-8 for those postings and that's always
> wrong -- as you might imagine ;)

On decoding it should be smarter since non-ASCII and non-UTF-8 texts
typically is invalid UTF-8, so it is possible to detect and recover.
I posted some tests to gnus.test on quimby and they don't work well.
If the emacs mule engine handles the magic, it should be simple to
make Gnus do the right thing, otherwise it might require some work.

Maybe a mm-decoding-system-priorities.  Hm.