http://www.pcworld.com/article/2141120/yahoo-email-antispoofing-policy-break...
“Lists invariably use their own bounce address in their own domain, so the SPF doesn’t match,” Levine said. “Lists generally modify messages via subject tags, body footers, attachment stripping, and other useful features that break the DKIM signature. So on even the most legitimate list mail like, say, the IETF’s, most of the mail fails the DMARC assertions, not due to the lists doing anything ‘wrong’.”
The central problem is yahoo sets dmarc=fail p=reject, and google honors it, and yet many other mail providers don't. So it ends up being a silent failure that neither the sender to a mail list nor affected recipients easily can learn about or understand. If there is anything lists are doing wrong, they probably ought to inform or deny signup to anyone using such a mail service configured in this fashion. Only the mail list server has all the available information to predict this will be a problem. -- Chris Murphy -- To unsubscribe, e-mail: opensuse-factory+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-factory+owner@opensuse.org