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SPF Checker

Check SPF records and validate your domain sender policyAnyone on the internet can send an email claiming to be from your domain; that is how email was designed. SPF is the countermeasure, and this validator queries your live TXT records and breaks the policy down mechanism by mechanism.

✓ Free to use✓ No sign-up✓ Ready in your browser
// SPF CHECKER · GET STARTED

Use SPF Checker

Check SPF records and validate your domain sender policy

// SPF CHECKER · HOW IT WORKS

How to use the SPF Checker

01

Enter domain

Enter the domain you want to check (e.g. example.com).

02

Run the check

Click "Check SPF" and wait for the live DNS lookup to finish.

03

Review the verdict

Review the verdict, the parsed mechanisms, and the fix suggestions.

// SPF CHECKER · ABOUT THIS TOOL

About the SPF Checker

SPF is one of the three pillars of email authentication, alongside DKIM and DMARC. Without a correct SPF record, anyone can send mail that appears to come from your domain. The SPF Checker queries your live TXT records, finds the v=spf1 policy, and breaks it down mechanism by mechanism. It also counts your DNS lookups against the strict limit of 10 and tells you in plain language what to fix, so your legitimate mail keeps landing in the inbox.

Where it helps most

Check, fix, re-check.

New sender onboarding

After adding a marketing platform or migrating providers, confirm the merged record is valid and under the limit.

Deliverability drops

The parsed mechanisms show which include is missing or which sending service was never added.

Post-edit confirmation

DNS changes propagate on TTL, so re-run the check after each edit to confirm the world sees the new policy.

Multi-service setups

Each third-party service adds lookups; the tool counts them all toward the ten-lookup limit.

What gets validated

The checks that bite.

The 10-lookup limit

Every include, a, mx, ptr, exists and redirect costs a lookup; exceed ten and SPF fails for legitimate mail too.

Deprecated mechanisms

The deprecated ptr mechanism is flagged whenever it appears in the record.

One-record rule

Verifies you have exactly one SPF record, since multiple records invalidate each other entirely.

Qualifier check

Checks whether you end with a softfail (~all) or a hard fail (-all), and what each means.

SPF Checker: built for trust

Live TXT records parsed mechanism by mechanism. No signup, the fastest feedback loop in email authentication.

// SPF CHECKER · COMMON QUESTIONS

SPF Checker FAQs

SPF (Sender Policy Framework) is a TXT record in your DNS that lists which mail servers may send email for your domain. Receiving servers check it to decide whether an incoming message is genuine or spoofed.
// SPF CHECKER · KEEP EXPLORING

Related tools

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DMARC Checker

SPF and DKIM prove things about an email, but neither tells servers what to do when authentication fails. That instruction lives in your DMARC policy record. This analyzer reads the live record and breaks every tag into plain language.

Open tool →DKIM Checker

Every legitimate email should be cryptographically signed by its sender. DKIM attaches a signature to each outgoing message, verified against a public key in your DNS. This tool looks up selector records and validates what it finds.

Open tool →DNS Lookup

DNS is the phonebook of the internet, yet it is surprisingly hard to see what the rest of the world actually sees for your domain. Type in any domain and this lookup tool shows every published record in seconds, with no command line and no signup.

Open tool →
// SPF CHECKER · FROM THE BLOG

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