Transport security
What is TLS-RPT?
How aggregate reports reveal failures in secure mail transport.
5 minute readUpdated October 16, 2026
Aggregate transport reporting
TLS-RPT lets a domain publish where participating senders should report TLS negotiation and policy failures.
Example
v=TLSRPTv1; rua=mailto:[email protected]Pair it with transport policy
TLS-RPT is most useful alongside MTA-STS or DANE. Reports help find invalid certificates, MX mismatches and other delivery-path failures.