Gmail does get trained, but to solve this problem you're going to have
to filter the messages and select "never send to spam." The emails
they think are spam will get marked up but they will show up where you
want them. I always filter email lists into their own folder, but I
guess you can have a filter that does nothing other than indicating
your preference not to mark the emails as spam.
I think the problem for this list was all the 'bent light mount photos.
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