Deliverability & DNS

DMARC Policy Generator

Generate p=none, quarantine, or reject records with reporting addresses and plain-English notes on what each tag does.

All free toolsFree · nothing stored

Build your policy

Policy (p)Start at none, read reports for two weeks, then tighten.

Subdomain policy (sp)Optional. Useful when subdomains send but the root does not.

Aggregate reports (rua)Daily XML summaries. This is where the value is.

Forensic reports (ruf)Optional. Most providers never send these.

Percentage

DKIM alignment

SPF alignment

Publish as a TXT record at _dmarc.yourdomain.com.

TXT _dmarc

v=DMARC1; p=none; adkim=r; aspf=r; fo=1

v=DMARC1Version. Always first.

p=What receivers do when a message fails alignment.

sp=Same decision, but for subdomains.

rua=Where daily aggregate reports are mailed.

pct=Share of failing mail the policy applies to.

adkim / aspfRelaxed allows subdomains to align; strict demands an exact match.

fo=1Report when either SPF or DKIM fails, not only both.

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DKIM Checker

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