Email Deliverability Checker
Score SPF, DKIM, and DMARC for any domain and get concrete fix recommendations. Free, instant.
Fair-use limits apply, no signup needed.
What We Check
SPF
Confirms a valid v=spf1 TXT record authorizes your sending servers.
DMARC
Confirms a policy is published at _dmarc.yourdomain.com.
DKIM
Scans common DKIM selectors for a valid signing key.
Frequently Asked Questions
What are SPF, DKIM, and DMARC?
SPF, DKIM, and DMARC are DNS-based email authentication standards. SPF lists which servers can send email for your domain, DKIM cryptographically signs your emails, and DMARC tells receiving servers what to do when a message fails those checks. Together they prove your emails are legitimate and protect against spoofing.
Why is my authentication score low?
A low score usually means one or more of SPF, DKIM, or DMARC is missing or misconfigured. Missing DMARC is the most common issue — many domains have SPF but never publish a DMARC policy.
Does a perfect score guarantee my emails land in the inbox?
No, but it removes one of the biggest risk factors. Inbox placement also depends on sender reputation, content, engagement, and list quality — which is where email verification comes in.
How do I fix missing DKIM?
DKIM is configured per email service provider. Check your ESP or mail server documentation for DKIM setup instructions, then publish the provided public key as a TXT record at the selector subdomain shown in your ESP settings.
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