SPF Record Validator
Validate SPF records against RFC 7208. Check syntax, DNS lookup limits, policy strength, and common misconfigurations.
SPF Quick Reference
Qualifiers
- + Pass (default) - Allow the email
- - Fail - Reject the email
- ~ SoftFail - Accept but mark suspicious
- ? Neutral - No policy statement
Key Limits
- 10 maximum DNS lookups per evaluation
- 255 characters per TXT string
- 512 bytes recommended max UDP response
- ptr deprecated in RFC 7208
About This Tool
Validate SPF (Sender Policy Framework) records against RFC 7208 rules. Checks syntax, mechanism validity, DNS lookup limits, policy strength, and common misconfigurations like duplicate includes, deprecated ptr usage, and redirect/all conflicts.
100% Client-Side Analysis
All validation runs in your browser. Domain lookups use our DNS infrastructure but the analysis itself is entirely local.