Email Authentication

TLS-RPT check

TLS-RPT asks other mail servers to report when they could not deliver to you securely, so you hear about problems before mail is lost.

Check this on your own domain now. It is free with a DomainGuard account and works on any domain. The check reads only what your domain publishes, and gives you a report you can send to whoever runs your website.

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What we look at

We look for a TXT record at _smtp._tls.yourdomain beginning with v=TLSRPTv1.

Why it matters to your business

Without it, encrypted-delivery failures to your mail servers are invisible to you. With it, large providers such as Google send you a report covering each day. It costs nothing and is the safety net that makes MTA-STS safe to turn on.

How to fix it

  1. Publish a TXT record at _smtp._tls.yourdomain: v=TLSRPTv1; rua=mailto:tls-reports@yourdomain.

If you would rather not touch DNS or server settings yourself, forward this page and your report to whoever manages your website, or ask us to do it.

Check your own site for this

A free outside-in check of your website, email and domain records, with what to fix first. No card and no password to choose.

Free, no card, no password to choose: your name and email make a free DomainGuard account that keeps the report, and we email you a link to confirm it. We only read what the internet can already see.

Read the help article