SPF Checker

A domain SPF checker to validate SPF records, helping mail administrators verify allowed senders and reduce spoofing across email infrastructure.

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Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

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About This Tool

Purpose & User Intent: The SPF Checker analyzes a domain's SPF record to determine if it authorizes a given sender. It is aimed at mail administrators, security engineers, and deliverability specialists who audit SPF deployments, test new sending sources, and harden email authentication. The tool does not send mail and focuses on policy evaluation. Core Logic & Features: It retrieves the domain's SPF TXT record, parses mechanisms (ip4, ip6, include, redirect, exists, all) with qualifiers, and can simulate delivery from a specified IP. Required input is the domain; optional inputs include ip_address, dns_timeout, and a recursion depth for includes. Outputs include the final result, the active SPF record string, evaluated mechanisms, and remediation guidance.

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How to Use

Provide inputs: domain (required), ip_address (optional) to simulate a sending host.
Optionally adjust dns_timeout and recursion depth for includes.
Run evaluation by submitting inputs.
Review outputs: result, spf_record, mechanisms_evaluated, and explanation.
Apply SPF changes to the domain's DNS if remediation is required.

Frequently Asked Questions

Find Quick Answers

How does SPF checker determine pass or fail?

It retrieves the domain's SPF TXT record, parses mechanisms, resolves includes, tests the sending IP against ip4/ip6 rules, applies qualifiers, and returns pass, fail, softfail, or neutral along with guidance.

Can I test with a specific sending IP?

Yes; provide the ip_address input to simulate the mail source and observe how SPF evaluation affects the result.

What if there are multiple SPF records?

RFC 7208 allows a single SPF TXT record. If multiple records are found, the tool flags a syntax/validation issue and reports neutral with remediation guidance.

Does this tool verify DMARC alignment?

No; SPF checker focuses on SPF record validity and sender authorization. DMARC alignment and policy evaluation are outside its scope.

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