Hi Jacob, [not speaking for MS or anyone other than myself] Section 6.6.4 of the DMARC RFC states
If email is subject to the DMARC policy of "reject", the Mail Receiver SHOULD reject the message (see Section 10.3<https://tools.ietf.org/html/rfc7489#section-10.3>) SHOULD does not require anyone to reject the message. It is perfectly reasonable for a high volume mail receiver to use additional signals to influence their decision to accept/reject or quarantine that email. To be clear, having the sender publish a p=REJECT is a very strong and convenient signal for email delivery. That said, tt does not need to be the sole arbitrator of accepting or rejecting an email message. I hope this helps. -Sam From: dmarc-discuss <[email protected]<mailto:[email protected]>> on behalf of Jacob Evans via dmarc-discuss <[email protected]<mailto:[email protected]>> Reply-To: Jacob Evans <[email protected]<mailto:[email protected]>> Date: Wednesday, November 25, 2015 10:14 AM To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[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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