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Outlook.com Is Rejecting Mail From Domains With No DMARC Record: What Actually Changed

550 5.7.1 Message rejected: Message lacks SPF/DKIM/DMARC Auth Records (AS9031519) That single line is the whole story, and it is now landing in the logs of small businesses that have never touched a bulk-mail rule in their lives. Since November 5, 2026, Microsoft's consumer mail service — outlook.c…

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  1. 2026-11-09 17:48 · DEV Community — AI
    Outlook.com Is Rejecting Mail From Domains With No DMARC Record: What Actually Changed

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