Free SPF checker & validator.
Look up your domain's SPF record or paste one to validate syntax. No account required.
- Detect SPF syntax errors and excessive DNS lookups
- Validate any raw SPF record against RFC 7208
- 10 free checks per day. No login needed
Lookup budget
Every include:, a, mx, ptr and exists mechanism costs one DNS lookup, including the ones nested inside your ESP's own record. Past ten, receivers return PermError and the SPF leg of DMARC fails.
Results appear here: the raw record, the lookup budget as a ten-slot meter, and every warning in plain language.
Control who sends email for your domain.
SPF prevents spammers from forging your domain in the From address.
Prevent spoofing
Authorize specific mail servers to send email on your behalf.
Improve deliverability
Email providers penalize domains without SPF, causing spam placement.
Quick to implement
A single TXT record significantly boosts email security.
Lookup counts creep back up.
Every new tool adds an include. ZeroHook re-checks SPF, DKIM, DMARC and DNSSEC every day across every domain you own, and alerts you before receivers start returning PermError.