DNS
DMARC explained: none, quarantine, reject
DMARC builds on SPF and DKIM by requiring alignment with the visible From domain, and lets you set a policy.
p=none— monitor only. Start here.p=quarantine— failing mail goes to spam.p=reject— failing mail is refused outright.
Move up only once your reports show all legitimate mail passing. Jumping to p=reject too early rejects your own mail.
Ready to send authenticated mail?
Get started DKIM signing, SPF alignment and DMARC are set up the moment you verify a domain.