SPF Validator

SPF Checker

Test SPF syntax, count lookups against the 10-query RFC limit and avoid PermErrors.

Quick samples:

How It Works in 3 Simple Steps

01

Enter sending domain

Provide the domain hosting your SPF TXT record.

02

Parse SPF Mechanisms

Analyzes includes, ip4, ip6, and ~all / -all qualifiers.

03

Count Lookups

Calculates nested DNS lookups to verify you stay under RFC 7208 limits.

Pro Tips for Maximum Performance
  • Never have more than one SPF TXT record on a single domain.
  • Flatten SPF if your include count exceeds 8.

Frequently Asked Questions

RFC 7208 limits the number of DNS queries during SPF evaluation to 10. Exceeding this returns a PermError and fails SPF.

We recommend ~all during rollout and -all once all sending services and IP addresses are cataloged.

Related Free Outbound Tools

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DMARC Checker

Read a DMARC policy in plain English: enforcement level, reporting, alignment and what to change next.

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