Microsoft is not the enemy here [😊]
As was the case with -all, o=- and discardable: * although it may feel like one, p=reject is not a control over receivers' environments given over to domain registrants, it's purely a request to receivers; * if a receiver doesn't yet believe that the domain registrant knows what they're doing (or does believe that they don't) then the request will of course be ignored; * even if the domain registrant clearly has all of their ducks in a row, honouring p=reject will almost certainly cause collateral damage because of various types of DKIM-breaking forwarding, so the receiver has to believe that the benefit in honouring p=reject will exceed the harm in doing so, before deciding to do so; and * some receiver environments make it unusually difficult to make this trade-off well, Microsoft's in particular. The mere failure of a single message to be rejected in a single case is not cause for concern. Per the situation motivating ARC, there's still plenty more to do. - Roland [http://www.trustsphere.com/images/signatures/trustsphere.png]<https://www.trustsphere.com> Roland Turner | Labs Director Singapore | M: +65 96700022 [email protected]<mailto:[email protected]> ________________________________ From: dmarc-discuss <[email protected]> on behalf of Jacob Evans via dmarc-discuss <[email protected]> Sent: Wednesday, 25 November 2015 23:14 To: [email protected] Subject: [dmarc-discuss] Office 365 does not repect dmarc rejection policy!? Here's a snip of the message header, it looks like Microsoft has opted to implement DMARC, but not respect it. Authentication-Results: spf=pass (sender IP is 209.141.51.12) smtp.mailfrom=jacobdevans.com; appalachiatech.com; dkim=none (message not signed) header.d=none;appalachiatech.com; dmarc=fail action=oreject header.from=appalachiatech.com; Do we expect Microsoft to respect it or is this another lost battle to the software giant? -Jake
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