Required by Gmail and Yahoo for bulk senders. Pick a policy, get a valid DMARC TXT record for _dmarc.yourdomain.com.
_dmarc)v=DMARC1; p=noneVerify after adding with the free deliverability test
Jumping straight to p=reject with a misconfigured sender silently kills legitimate mail. The safe path: p=none for 2-4 weeks while reading aggregate reports, fix any sender that fails, then quarantine, then reject.
DMARC only works on top of SPF and DKIM. Check all three with the deliverability test and see the full deliverability guide.
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