I thought I would post the following, to make sure everyone is aware and getting prepared.
https://dmarc.org/2015/10/global-mailbox-providers-deploying-dmarc-to-protect-users/ - Yahoo Expanding Use of Strict DMARC Policies - Enabling DMARC To Protect More Types of Email (ARC) - Google To Adopt Stricter DMARC Policies in 2016 There is a mailing list to discuss ARC implementation: http://lists.dmarc.org/mailman/listinfo/ Tho the protocol bits are likely to be discussed on the DMARC IETF mailing list.
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