Free tool · No signup required
Check your SPF, DKIM, and DMARC records in 30 seconds. Get a deliverability score and actionable fixes.
5 free checks · No credit card
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Gmail and Outlook silently send 20% of legitimate business emails to spam. Without proper SPF, DKIM, and DMARC records, your carefully crafted emails could be invisible.
of business emails go to spam
of domains have misconfigured records
to check and find issues
Get your deliverability score in three simple steps
Just type your domain name. No verification needed.
SPF, DKIM, DMARC, and MX records analyzed instantly.
See exactly what's wrong and how to fix it.
Verifies which mail servers are allowed to send email on behalf of your domain. Prevents spoofing.
Adds a digital signature to your emails proving they haven't been modified in transit.
Tells receiving servers what to do with emails that fail SPF or DKIM checks.
Verifies your domain can receive emails and identifies your mail server provider.
Start free. Pay only when you need more.
Get started instantly
$0
For teams and agencies
$5 / 50 checks
These three protocols work together to verify that emails claiming to come from your domain are legitimate. Gmail, Outlook, and other providers check these records to decide if your email goes to inbox or spam. Missing or misconfigured records = spam folder.
No. We only query public DNS records (the same data anyone can look up). We don't store your domain, email, or any personal information.
80+ is excellent, 60-79 is good, 40-59 needs work, below 40 means your emails are likely hitting spam. Focus on fixing the issues we identify to improve your score.
Yes! After getting an API key (free or paid), you can call our API directly:
curl "https://mailcheck.duckbot.dev/api/check?domain=example.com&key=YOUR_KEY"
Check your deliverability in 30 seconds. It's free.