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🛡️ DMARC Record Builder
DMARC ties SPF and DKIM together with a policy: what should receivers do when authentication fails. This builder generates a complete _dmarc.yourdomain.com TXT record from your chosen policy, reporting addresses, and alignment modes.
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Examples
Conservative start
Output
v=DMARC1; p=none; rua=mailto:dmarc@yourdomain.comAfter tuning
Output
v=DMARC1; p=reject; pct=100; rua=mailto:dmarc@yourdomain.com; aspf=s; adkim=sFrequently asked questions
What is the rollout path?
Start with p=none to collect reports. After 30 days of clean data, move to p=quarantine. After another 30 days, p=reject. Skipping steps is how you accidentally block your own legitimate mail.
About this calculator
DMARC Record Builder runs entirely in your browser using standard formulas. No data is sent to any server. We don't share your inputs with lenders, brokers, or anyone else — there's no funnel and no follow-up email.
Related tools
- ✉️ SPF Record Builder — Build a valid SPF TXT record for your email domain.
- 📧 Email DNS Check — Look up MX, SPF, DMARC records for a domain in one shot.
- 📚 DNS Record Types Reference — What each DNS record type does (A, AAAA, MX, TXT, CNAME, SRV, CAA, etc.).
Why this tool
vs typical free network-tools sites
| NetToolset | Typical free site | |
|---|---|---|
| Price | Free | Free |
| Signup required | No | Often (for advanced features) |
| Ads inside the tool | No | Yes (banner + interstitial) |
| Logs your IP / queries | No | Yes (often resold) |
| Data sent to a server | Math runs in browser; lookups hit Cloudflare DoH directly | Yes (all goes through their server) |
| Open source | Yes | No |
| Bookmarkable URL per tool | Yes | Mixed |
| Multilingual | EN / ES / PT / FR / DE | Usually EN only |
| Loads in under 1s | Yes (static) | Often slow (ad tracking) |