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✉️ SPF Record Builder
SPF (Sender Policy Framework) tells receivers which servers may send mail for your domain. Misconfigured SPF means your legitimate mail gets dropped. This builder generates a valid v=spf1 record from common building blocks (include: , ip4: , mx, a) and adds the qualifier you choose (~all softfail, -all hardfail).
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Examples
Google Workspace
Output
v=spf1 include:_spf.google.com ~allMulti-provider
Output
v=spf1 include:_spf.google.com include:mailgun.org ip4:198.51.100.5 ~allFrequently asked questions
~all vs -all?
~all is "softfail" — receivers mark unauthorized mail as suspicious. -all is "hardfail" — receivers reject. Start with ~all while you test, then switch to -all.
About this calculator
SPF 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
- 🛡️ DMARC Record Builder — Build a valid DMARC TXT record with reporting addresses.
- 📧 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) |