TLS-RPT
TLS-RPT (SMTP TLS Reporting) is a DNS TXT record that tells other mail servers where to send reports summarizing TLS connection failures when they tried to deliver mail to the domain -- including failures related to an MTA-STS policy the domain has published. Without TLS-RPT, a domain enforcing MTA-STS has no visibility into legitimate senders whose mail is silently being deferred or rejected because they couldn't establish a compliant TLS connection, which makes rolling out strict TLS requirements risky without reporting to catch problems early. TLS-RPT is usually deployed alongside MTA-STS rather than on its own, and is defined in RFC 8460.
By AdminKit team, Netbase JSC · Updated