Microsoft Now Requires DMARC Records to Deliver Email to Outlook.com

Heise

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Outlook.com currently rejects emails from small senders without DMARC entry – even if SPF and DKIM are correct.

Numerama

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Since November 5, 2026, Microsoft's mainstream messaging has rejected some of the emails sent by domains that have not put in place a technical setting called DMARC. Microsoft has not officially announced anything, and small structures seem to be the first to be affected.

ENTER.CO

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If your company sends invoices, newsletters or notifications by mail and your domain does not publish a DMARC record, your messages to Outlook.com and Hotmail accounts may be being rejected since last week. Mail administrators found that Microsoft started rejecting those shipments even though they went through SPF and DKIM checks, the other two [...]