On Sat, Apr 16, 2016 at 7:50 PM, Chris Murphy <lists(a)colorremedies.com> wrote:
This seems to explain the issue. Yahoo basically wants everyone to
reject yahoo emails sent from other mail servers, which is what
mailing lists do. But Google is one of the few, I guess, that honor
this request, and that's why it goes to spam no matter what
anti-training is applied.
Old article too, 2014, so not a new problem.