SPF Checker

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

Tool coming soon!

We're working hard to get this tool ready for you.

Request Feature / Support

3,148+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

AI Web Tool Generator

Build Your Own Custom Web Calculator in Seconds

Type what tool or calculator you need below. Our AI will build it instantly for your site.

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.

Save your calculation history with a free account

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.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

Related Tools

Other useful calculators and utilities you might like

Spotify to MP3 Converter

Convert Spotify tracks and playlists to MP3 format instantly with our free online converter.

Road Distance Calculator

Calculate the driving distance and travel time between two addresses with our free online road dista...

Age Calculator

Calculate your exact age in years, months, and days from any birth date to any target date.

Currency Converter

Convert currencies instantly with real-time exchange rates and historical data support.

Your Feedback Matters

Help Us to Improve