Free tool

DMARC record generator

Build a valid _dmarc TXT record. Start at p=none to monitor, review your reports, then move to quarantine and reject.

Policy (start with none, then tighten)Aggregate report email (rua)Subdomain policy (optional)Apply to % of mail (pct)

Add this as a TXT record at _dmarc.yourdomain.com:

v=DMARC1; p=none

How to publish it

Copy the record above.
In your DNS, add a TXT record with host/name _dmarc (some providers want _dmarc.yourdomain.com).
Paste the value, save, and wait for DNS to propagate.
Re-run the checker to confirm it's live.