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Email Deliverability Tools
These email deliverability tools read the public DNS records that receiving servers use to judge your mail. Check MX, SPF, DKIM and DMARC, inspect headers and generate corrected records, all from your browser. Every lookup shows the resolver, the query time and when it ran, so you can trust and repeat the result.
MX Lookup Find a domain’s MX records with their priorities, the mail provider and each server’s IPv4 and IPv6 addresses. DMARC Checker Look up a domain’s DMARC record, validate every tag and see which policy it asks receivers to apply. SPF Checker Check a domain’s SPF record for syntax errors and count its DNS lookups across every include and redirect. DKIM Checker Look up a domain’s DKIM public key by selector, or try 21 common selectors, and check the key type and size. Domain Health Check Score a domain's MX, SPF, DKIM and DMARC records together out of 100 and see which one to fix first. Email Header Analyzer Parse raw email headers into delivery hops, authentication results and sender-domain comparisons. Reverse DNS Lookup Find the PTR hostname of an IPv4 or IPv6 address and check that the hostname resolves back to the same address. DMARC Record Generator Build a validated DMARC TXT record from your policy, report addresses and alignment, with DNS steps for common providers. SPF Record Generator Build one SPF record from your mail services, IP ranges and includes, with a live count of DNS lookups against the limit of 10. BIMI Checker Look up a domain's BIMI record, validate its tags and DMARC prerequisite, and test the SVG logo where the browser can fetch it. DKIM Record Generator Generate an RSA key pair for DKIM in your browser and get the DNS TXT record for your selector, with the private key as a download. MTA-STS and TLS-RPT Checker Check a domain’s MTA-STS record, policy file and TLS-RPT record, and confirm that every MX host matches the policy.
How to Test Email Deliverability
Testing deliverability starts with the records a receiver checks before it reads your message. Run Domain Health for an overview, then open the specific tool for any warning.
| Your goal | Start here |
|---|---|
| Find a domain’s MX records with their priorities, the mail provider and each server’s IPv4 and IPv6 addresses. | MX Lookup |
| Look up a domain’s DMARC record, validate every tag and see which policy it asks receivers to apply. | DMARC Checker |
| Check a domain’s SPF record for syntax errors and count its DNS lookups across every include and redirect. | SPF Checker |
| Look up a domain’s DKIM public key by selector, or try 21 common selectors, and check the key type and size. | DKIM Checker |
| Score a domain's MX, SPF, DKIM and DMARC records together out of 100 and see which one to fix first. | Domain Health Check |
| Parse raw email headers into delivery hops, authentication results and sender-domain comparisons. | Email Header Analyzer |
| Find the PTR hostname of an IPv4 or IPv6 address and check that the hostname resolves back to the same address. | Reverse DNS Lookup |
| Build a validated DMARC TXT record from your policy, report addresses and alignment, with DNS steps for common providers. | DMARC Record Generator |
| Build one SPF record from your mail services, IP ranges and includes, with a live count of DNS lookups against the limit of 10. | SPF Record Generator |
| Look up a domain's BIMI record, validate its tags and DMARC prerequisite, and test the SVG logo where the browser can fetch it. | BIMI Checker |
| Generate an RSA key pair for DKIM in your browser and get the DNS TXT record for your selector, with the private key as a download. | DKIM Record Generator |
| Check a domain’s MTA-STS record, policy file and TLS-RPT record, and confirm that every MX host matches the policy. | MTA-STS and TLS-RPT Checker |
Email Deliverability Check Tool
Domain Health scores MX, SPF, DKIM and DMARC together out of 100. The individual checkers then show each record tag by tag, and the record generators help you publish a corrected version.
Reverse DNS Tools
Receiving servers compare a sending IP address with its PTR record and often reject mail when the two do not match. Reverse DNS and blacklist checks show how your sending IP looks to them before you troubleshoot content.
Related Guides and Tools
What Is DMARC Policies, alignment and reports explained. How to Create an SPF Record Authorize your legitimate sending services. How to Read Email Headers Trace delivery and interpret authentication. Email Checker Tools Check addresses and understand suspicious messages. Email Generator Create useful email content without an account.