SPF Record Checker

Look up and validate SPF records with a full recursive lookup tree and issue detection

What does this tool check?

SPF Record Validation

Checks if your SPF record is syntactically correct and follows RFC 7208 specifications.

DNS Lookup Tree

Recursively resolves all include: mechanisms and shows the complete hierarchy of authorized senders.

Lookup Count

Counts the total DNS lookups required (max 10 allowed per RFC 7208). Exceeding this causes SPF failures.

Issue Detection

Identifies circular references, missing records, too many lookups, and other common SPF problems.

What is SPF?

SPF (Sender Policy Framework) is a DNS record that specifies which mail servers are authorized to send email on behalf of your domain.

  • Prevents email spoofing
  • Maximum 10 DNS lookups allowed
  • Required for DMARC compliance
  • Published as a TXT record

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