What is it?
This mail deliverability finding means the message did not produce an enforceable passing DMARC result. DMARC evaluates whether the visible From: domain aligns with either SPF or DKIM.
Why does it matter?
DMARC is the main policy layer that tells receivers how to handle mail claiming to be from your domain. Without a passing aligned SPF or DKIM result, receivers have less confidence that the message is legitimate, and domain spoofing is harder to control.
How to fix it?
Publish a DMARC record and make sure at least one authentication path aligns with the visible From: domain.
_dmarc.example.com. 3600 IN TXT "v=DMARC1; p=none; rua=mailto:dmarc@example.com"Start with p=none to collect reports. After confirming legitimate senders pass aligned SPF or DKIM, move toward p=quarantine or p=reject.