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. http://www.pcworld.com/article/2141120/yahoo-email-antispoofing-policy-breaks-mailing-lists.html Chris Murphy -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: http://lists.fedoraproject.org/admin/lists/users@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org