← Glossary
Authentication
What is TLS-RPT?
A DNS record that asks sending servers to report failures to deliver mail to your domain over TLS.
How it works in practice
It pairs with MTA-STS: reports show where encrypted delivery to your domain failed, so you can fix certificates or MX problems before enforcing the policy.
The common mistake
Enforcing MTA-STS without TLS-RPT, and so never seeing the failures it causes.
Related terms
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