On 04/16/2016 12:17 PM, Chris Murphy wrote:
Short version as I understand it: yahoo's addition of dmarc=fail
request to consider any email not sent by a yahoo mail server as spam,
and Google is one of the few to honor that request.
And no wonder. To quote from Wikipedia:
Reject policy is fine for domains that don't have individual human
users, or for companies with firm staff policies that all mail goes
through the company mail server, and employees don't join mailing lists
and the like using company addresses, or the company provides a separate
less strictly managed domain for its staff mail. Strict policies will
never be appropriate for public webmail systems where the users will use
their mail addresses any way one can use a mail address.