DMARC

The policy record that tells receiving servers what to do when SPF/DKIM checks fail: monitor (p=none), quarantine, or reject. Also sends you reports about who's sending as your domain.

Free · no signup · last reviewed August 29, 2026

The definition

The policy record that tells receiving servers what to do when SPF/DKIM checks fail: monitor (p=none), quarantine, or reject. Also sends you reports about who's sending as your domain.

Why it matters to an owner

p=none is a smoke detector with no batteries — it watches and does nothing. Move to quarantine or reject once your real senders pass.

Keep going

SPF (Sender Policy Framework)A DNS record listing which servers may send email for your domain. Receiving servers check…DKIM (DomainKeys Identified Mail)A cryptographic signature your mail server adds to outgoing email, proving the message was…SPF, DKIM & DMARC in Plain EnglishThe three DNS records that make your email believable — what each does, the classic mistak…

This is the work. Want it done?

Everything here is free to use yourself — that’s the point. If you’d rather a senior marketer just handle it, in your accounts and your name: 20-minute call, no pitch deck.

Contact