And, of course, "Reject" only works if you are checking SPF/DKIM/DMARC at the edge, before sending the final 250 ok.
Afterwards, it's just another source of backscatter. Aloha, Michael. -- Michael J Wise Microsoft Corporation| Spam Analysis "Your Spam Specimen Has Been Processed." Open a ticket for Hotmail<http://go.microsoft.com/fwlink/?LinkID=614866> ? -----Original Message----- From: mailop <mailop-boun...@mailop.org> On Behalf Of Chris Wedgwood via mailop Sent: Wednesday, November 20, 2019 2:24 PM To: Bill Cole <mailop-20160...@billmail.scconsult.com> Cc: Jon Burke via mailop <mailop@mailop.org> Subject: [EXTERNAL] Re: [mailop] Reasons ISPs (Microsoft) ignore DMARC policy? > I don't know if mass-market ISPs view it this way, but in my roles > with email hosting providers I have never seen DMARC policies taken > seriously except as a nuisance for the operation of discussion mailing > lists. this matches my experience if i rejected messages on dmarc failure, i would reject a lot of legitimate messages (from well-intentioned but misconfigured senders and mailing lists) but not so much spam i would actually support everyone taking dmarc more seriously as an incentive to 'address' some of this _______________________________________________ mailop mailing list mailop@mailop.org<mailto:mailop@mailop.org> https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fchilli.nosignal.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fmailop&data=02%7C01%7Cmichael.wise%40microsoft.com%7Cdc1595e129af4a44a9dc08d76e08ee07%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637098857547752841&sdata=e8RaQtHztJpzi%2F%2B7U3au3ze3IkShUngbJhgfQwNOP8M%3D&reserved=0
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