Outlook.com Is Quietly Rejecting Email from Domains Without DMARC
Since November 5, 2026, Microsoft's consumer mail service Outlook.com has started rejecting email from domains that do not publish a DMARC record. Affected companies may see bounced emails when sending messages through outlook.com, hotmail.com, live.com, or msn.com addresses. The issue occurs without any official announcement. To fix the problem, add a DMARC record to the domain's DNS settings.
The record should include a policy of "p=none," which informs receivers to send reports but not take any action on failures. Once the DMARC record is in place, Outlook.com will recognize the domain as authenticated if it also passes SPF or DKIM checks.
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