MailRoute Blog company blog

Outlook.com is rejecting email from domains without DMARC

by Thomas A. Johnson mailroute.net published 2026-11-06

Since November 5, Outlook.com and Hotmail have been bouncing mail from domains with no DMARC record, small senders included. What changed, and the one-record fix.

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Security & PrivacyNetworking & Internet2026

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