DMARC record builder

Assemble a v=DMARC1 record — policy, report addresses, alignment, and sampling — without memorizing tag syntax.

Policy (p)Subdomain policy (sp)Aggregate report addresses (rua — one email per line)Forensic report addresses (ruf — optional, one per line)Failure reporting (fo)DKIM alignment (adkim)SPF alignment (aspf)Apply policy to % of mail (1–100)Report interval in seconds (60–86400)

Built in this browser. Nothing is sent anywhere.

Common tags only (p, sp, rua, ruf, fo, adkim, aspf, pct, ri). External-report verification records are your own setup step.

How to use

Pick the policy (none/quarantine/reject).
Add report addresses and options.
Copy the record to _dmarc.yourdomain.

What it supports

Tags p, sp, rua, ruf, fo, adkim, aspf, pct, ri; pct 1–100, ri 60–86400 s, record capped at 450 characters. External report destinations need their own verification step on the receiving domain.

Related tools

SPF record builder
Email header analyzer
Email signature builder

Related guides

Write an SPF record for your domain
Write a DMARC record that reports before it rejects