TLSA record stands for Transport Layer Security Authentication and is a component of STARTTLS. This makes it possible, in cooperation with DANE, to enforce the use of TLSA in mail traffic which ensures that mail traffic is inaccessible to third parties. TSLA records are always built in the same way and consist of 3 parts: a port number, the transport protocol for transporting the email, and the host, whose certificate must be verified.

Check the current security of your domain: