Free tool

DMARC record generator

Fill in the policy and copy the record into your DNS. If you're not sure what to pick, start with the note on why a DMARC record isn't protection.

Policy

nonequarantinereject

What receivers do with mail that fails. none monitors; quarantine sends to spam; reject refuses it.

Aggregate reports

Where the daily XML reports go. Without it, p=none watches nothing.

Percentage

Apply the policy to a fraction of mail while you watch the effect.

Subdomain policy

Subdomains don't inherit unless you set this.

DKIM alignment

SPF alignment

Your domain (optional)

Record

v=DMARC1; p=none

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