OnDMARC

As of July 2023, <a href="https://techcommunity.microsoft.com/t5/exchange-team-blog/announcing-new-dmarc-policy-handling-defaults-for-enhanced-email/ba-p/3878883" rel="nofollow noopener noreferrer" target="_blank">Microsoft</a> honours DMARC policies in M365. Read more <a href="https://blog.redsift.com/email/dmarc/microsoft-announces-its-new-handling-of-dmarc-policies/" rel="nofollow noopener noreferrer" target="_blank">here</a>.

No action needed: As of July 2023, Microsoft honours DMARC policies in M365.

How to make Office 365 reject emails
that fail DMARC

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How to make Office 365 reject emails that fail DMARC