Perfect, Thanks Terry.
From: "Terry Zink via dmarc-discuss" <[email protected]> To: [email protected] Sent: Wednesday, November 25, 2015 12:22:42 PM Subject: Re: [dmarc-discuss] Office 365 does not repect dmarc rejection policy!? This refers to Exchange Online Protection (EOP, aka the filtering arm of Office 355, not Hotmail/outlook.com). We don’t respect p=reject for multiple reasons: 1. If we did, nobody would ever be able to get their mailing list traffic from p=reject domains unless the list operated as a pure forwarder, and many of them don’t 2. Plenty of senders mess up their DMARC records, or send with misaligned traffic, and we don’t want to reject those as it gives the receiver no way to get them 3. We have about 15% of our customers who do complex routing which puts other mail servers in front of ours; or route through, then out of our service and back again, and break SPF, DKIM, DMARC and would otherwise be rejected If EOP overrides the p=reject action, this is indicated in the headers by putting an oreject into the action=<action> field and then marking as spam (setting SCL 9, the highest spam confidence level). For example: dmarc=fail action=oreject http://blogs.msdn.com/b/tzink/archive/2014/12/03/using-dmarc-in-office-365.aspx -- Terry From: dmarc-discuss [mailto:[email protected]] On Behalf Of Larry Finch via dmarc-discuss Sent: Wednesday, November 25, 2015 9:00 AM To: Nicolás via dmarc-discuss Subject: Re: [dmarc-discuss] Office 365 does not repect dmarc rejection policy!? On Nov 25, 2015, at 7:14 AM, Jacob Evans via dmarc-discuss < [email protected] > wrote: 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? Google doesn’t respect it either. Which is a good thing. Larry -- Larry Finch [email protected] _______________________________________________ dmarc-discuss mailing list [email protected] http://www.dmarc.org/mailman/listinfo/dmarc-discuss NOTE: Participating in this list means you agree to the DMARC Note Well terms (http://www.dmarc.org/note_well.html)
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