Is this tool really free?

Yes — 100% free, no signup, no email wall. We built it because our operators needed it and decided to share.

Do you store my data?

No. All calculations run entirely in your browser. Nothing is sent to or stored on any server.

Can I embed this on my site?

Reach out — we will share an embed snippet for teams that want to use this inside their own workflows.

Is the Email DNS Checker (SPF, DKIM, DMARC) really free?

Yes. No signup required, no data collected, nothing sent to our servers. Everything runs in your browser. We publish free tools because they build trust with operators who might eventually hire us — that's the entire business model.

How accurate is the Email DNS Checker (SPF, DKIM, DMARC)?

The math is correct and the formulas are standard. The output is only as good as the inputs you provide — garbage in, garbage out applies here like anywhere. We recommend calibrating with at least 3 months of real data before making major decisions based on the results.

Can I embed or share the Email DNS Checker (SPF, DKIM, DMARC)?

The tool lives at a stable URL that you can share with your team. We don't currently offer embeds, but the output is shareable via the copy button on calculator results. For white-label or embedded versions, contact us directly.

Why did you build these free tools?

Three reasons. First, they help operators make better decisions even if they never hire us. Second, they let us show our thinking publicly — the frameworks behind these tools come straight from our client engagements. Third, they attract the kind of operators who later become great clients.

What if I need something more complex?

The free tools cover standard scenarios. For custom analysis — multi-channel attribution, cohort LTV modeling, MMM — we do this as part of paid engagements. Our CRO & Analytics service starts at $6k/month and includes custom dashboarding plus BigQuery setup if needed.

All tools

Live SEO

100% Free · No Signup

Email DNS Checker (SPF, DKIM, DMARC)

Check if your domain is protected against email spoofing & spam.

Instant results

No data stored

Updated 2026

Quick Answer

This tool checks your domain's email authentication DNS — SPF, DKIM and DMARC. Without these, anyone can spoof your domain, your emails land in spam, and scammers can impersonate your brand. It's one of the most overlooked and highest-impact fixes for deliverability.

Enter your domain