TLS-RPT Checker
Verify the TLS-RPT record that collects reports about TLS delivery failures.
Free • no sign-up • runs live in your browser.
What is TLS-RPT?
TLS-RPT (SMTP TLS Reporting) asks sending providers to send you daily reports whenever they fail to establish a secure TLS connection to your mail servers. It's the companion to MTA-STS and DANE: those enforce TLS, while TLS-RPT gives you visibility when something goes wrong.
How to set it up
Publish a TXT record at _smtp._tls.yourdomain.com such as v=TLSRPTv1; rua=mailto:[email protected]. Reports arrive as JSON and summarize successful and failed TLS sessions.
Frequently asked questions
No, but they're best together: MTA-STS enforces TLS and TLS-RPT tells you when enforcement or negotiation fails.
TLS-RPT reports are JSON documents sent to your rua address, usually once per day per reporting provider.
Major providers like Google and Microsoft send TLS-RPT reports, so even a single record gives useful coverage.