DMARC Record Builder

Build a DMARC DNS TXT record to protect your domain from spoofing.

Policy (p=)

none

Monitor only — take no action. Good for initial deployment.

quarantine

Send failing messages to spam. Recommended for most domains.

reject

Reject failing messages outright. Strictest option.

Aggregate report URI — rua (optional)

Forensic report URI — ruf (optional)

Percentage (pct=)

SPF alignment

DKIM alignment

Subdomain policy (sp=)

DNS TXT Record

v=DMARC1; p=none

Add as TXT record — name: _dmarc (i.e. _dmarc.yourdomain.com), TTL: 3600.

What is DMARC?

DMARC(Domain-based Message Authentication, Reporting & Conformance) tells receiving mail servers what to do when an email fails SPF or DKIM checks. Start with p=none to collect reports without affecting delivery, then move to quarantine, then reject as you gain confidence. The rua address receives daily aggregate reports showing who is sending on behalf of your domain.

Private & free — this tool runs entirely in your browser.