EmailHealth

Email Health Checker

Test your domain's email deliverability and security — SPF, DKIM, DMARC, MX, TLS, reverse DNS and blacklist status — in seconds.
No test yet
Enter a domain above and run a test to see its full email health report — grade, category breakdown, and fixes.
SPF Record
DKIM Signature
DMARC Policy
MX & Mail Servers
Transport TLS / STARTTLS
Reverse DNS (PTR)
Blacklist & Reputation
BIMI & Brand Signals

Free email health checker

The ShowDNS Email Health Checker 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 — then highlights the issues that hurt deliverability and how to fix them. It is free, needs no signup, and works on any public domain.

Related Tools
Discover similar utilities
Diagnostics

Fix Email Issues

SPF Validator

DMARC Lookup

MX Lookup

Domain Health Checker

Email Health Checker — Frequently Asked Questions

An email health check is a consolidated audit of everything that affects a domain's email deliverability and security — SPF, DKIM and DMARC authentication, MX records, STARTTLS and MTA-STS transport encryption, reverse DNS (PTR), BIMI brand signals and blacklist reputation. ShowDNS combines all of these into a single graded report.

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.