What is SPF and why is it important?

SPF (Sender Policy Framework) is an email authentication method that specifies which mail servers are authorized to send emails for your domain. It helps prevent email spoofing and improves deliverability by allowing receiving servers to verify that emails are coming from authorized sources.

What is DKIM and how does it work?

DKIM (DomainKeys Identified Mail) is an email authentication method that uses cryptographic signatures to verify that an email was sent by an authorized server and hasn't been tampered with. It adds a digital signature to email headers that receiving servers can verify.

What is DMARC and why do I need it?

DMARC (Domain-based Message Authentication, Reporting & Conformance) is an email authentication protocol that builds on SPF and DKIM. It allows domain owners to specify how receiving servers should handle emails that fail SPF or DKIM checks, helping prevent phishing and email spoofing.

How is the deliverability score calculated?

The deliverability score (0-100) is calculated based on: SPF record presence (30 points), DMARC record presence (30 points), DKIM record presence (25 points), MX records configuration (10 points), and blacklist status (5 points). A score of 80+ indicates excellent setup, 60-79 is good but needs improvement, and below 60 requires attention.

What should I do if my domain is on a blacklist?

If your domain is listed on a blacklist, you should: 1) Investigate the cause (spam complaints, compromised account, etc.), 2) Fix the underlying issue, 3) Request removal from the blacklist provider, 4) Monitor your email practices to prevent future listings, and 5) Consider using a dedicated IP address for sending.

Can I check both domain and email address?

Yes! The tool supports two modes: Domain mode (check the entire domain's email configuration) and Email mode (check a specific email address, which extracts and checks the domain). Both modes verify SPF, DKIM, DMARC, MX records, and blacklist status.

How do I find my DKIM selector?

Common DKIM selectors include: "default", "google", "k1", "selector1", "mail". Check your email service provider's documentation, or look at email headers from sent emails. The selector is usually found in the "DKIM-Signature" header field.

Email Deliverability Checker

Fast, practical deliverability checks for SPF, DKIM, DMARC, MX, domain blocklists, plus transport & brand signals (MTA-STS, TLS-RPT, BIMI). Bulk and comparison modes included.

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Enter a domain or email address to verify email authentication setup and deliverability instantly.

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