On 04/15/2014 06:50 PM, Conrad G T Yoder wrote: > > So it really doesn’t affect domain email hosted by Yahoo such as att.net, > sbcglobal.net, ymail.com, etc? Yahoo has not added a dmarc p=reject record > for email from these domains?
Short answer: That's correct. Long answer: mark@Notebook-09:~$ dig +short txt _dmarc.ymail.com "v=DMARC1\; p=none\; pct=100\; rua=mailto:[email protected]\;"; mark@Notebook-09:~$ dig +short txt _dmarc.sbcglobal.net mark@Notebook-09:~$ dig +short txt _dmarc.att.net mark@Notebook-09:~$ The above means that ymail.com publishes a DMARC p=none policy and sbcglobal.net and att.net publish no DMARC policy at all, so while those domains may honor the DMARC policy of the From: domain for incoming mail, mail From: those domains is currently unaffected. Note that ymail.com does request aggregate reports to be sent to [email protected] which means that failures will be reported even if they don't affect mail delivery. Note also, that sec 6 of the draft DMARC specification <https://datatracker.ietf.org/doc/draft-kucherawy-dmarc-base/> says in part: Mail Receivers MAY choose to reject or quarantine email even if email passes the DMARC mechanism check. ... Mail Receivers MAY choose to accept email that fails the DMARC mechanism check even if the Domain Owner has published a "reject" policy. so no one is REQUIRED to honor DMARC policy, and even domains which publish a DMARC policy are free to ignore the DMARC policy that should apply and accept, reject or quarantine any particular incoming message for other reasons. -- Mark Sapiro <[email protected]> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan ------------------------------------------------------ Mailman-Users mailing list [email protected] https://mail.python.org/mailman/listinfo/mailman-users Mailman FAQ: http://wiki.list.org/x/AgA3 Security Policy: http://wiki.list.org/x/QIA9 Searchable Archives: http://www.mail-archive.com/mailman-users%40python.org/ Unsubscribe: https://mail.python.org/mailman/options/mailman-users/archive%40jab.org
