Tool features
6 checks
SPF, DKIM & DMARC
Checks each authentication record exists, parses cleanly and is strong enough to stop spoofing.
MX & mail provider
Resolves your MX hosts, identifies the provider and flags missing or broken mail routing.
Transport security
Tests STARTTLS on your mail servers and looks for MTA-STS and TLS-RPT policies.
Reverse DNS
Confirms each mail server IP has a PTR record that resolves back (forward-confirmed rDNS).
Blacklist reputation
Looks up your mail server IPs on major DNS blocklists.
One A+ to F grade
Rolls every check into a single score with the fixes that move it most.
What is an email health check & how it works
An email health check runs a complete, read-only audit of a domain's email configuration and grades it from A+ to F. In a single test it checks SPF, DKIM and DMARC authentication, MX records and mail provider, STARTTLS, MTA-STS and TLS-RPT transport security, reverse DNS (PTR) and forward-confirmed reverse DNS, blacklist reputation, and BIMI brand signals.
Mailbox providers weigh all of these when deciding whether mail reaches the inbox, lands in spam or is rejected. The report highlights the issues that hurt deliverability and how to fix them. It is free, needs no signup, and works on any public domain.
Authentication
SPF, DKIM and DMARC prove mail really comes from your domain.
Transport
STARTTLS and MTA-STS keep mail encrypted between servers.
Reputation
Blocklist status and reverse DNS shape how receivers trust your IPs.
How to use this tool
1
Enter a domain
Enter the domain or email address you want to test (for example, example.com).
2
Run the test
Click “Run test” to check SPF, DKIM, DMARC, MX, STARTTLS/MTA-STS, reverse DNS, BIMI and blacklist reputation.
3
Read the grade
Review the overall A+–F grade and the per-category results.
4
Fix and re-check
Open a category’s dedicated analyzer (SPF Lookup, DKIM Lookup, DMARC Lookup and more) for a deeper look, then apply the recommended fixes.
Related tools
5 tools
Fix Email Issues
Get recommendations and solutions to fix email deliverability problems and configuration issues
SPF Validator
Validate SPF record syntax and check for configuration errors and best practices
DMARC Lookup
Check DMARC policy records for email authentication, reporting, and policy enforcement
MX Lookup
Find mail exchange (MX) records for email server configuration and priority
Domain Health Checker
Full domain audit report covering DNS, DNSSEC, WHOIS, SSL/TLS, security headers, CDN, IPv6, HTTP/2 & HTTP/3, blacklists, DNS propagation and email authentication
Email Health Checker — Frequently Asked Questions
6 Q&A
Yes. The email health checker is completely free, requires no signup, and you can run it on any public domain as many times as you need.
It checks SPF, DKIM and DMARC authentication, MX records and mail provider, STARTTLS / MTA-STS / TLS-RPT transport security, reverse DNS (PTR) and forward-confirmed reverse DNS, blacklist and reputation across major DNSBLs, and BIMI brand logo readiness.
Each category is scored and the results are combined into an overall score that maps to a letter grade from A+ (95+) down to F (below 60), giving you a single measure of your domain's email health.
Yes. You can enter a full email address and the checker will automatically test the domain part after the @ sign.
No. The email health checker is completely read-only. It only performs standard DNS, SMTP and TLS lookups to evaluate the domain and never modifies any records.