SMTP MTA Strict Transport Security (MTA-STS), September 2018
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- D. Margolis
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SMTP MTA Strict Transport Security (MTA-STS) is a mechanism enabling mail service providers (SPs) to declare their ability to receive Transport Layer Security (TLS) secure SMTP connections and to specify whether sending SMTP servers should refuse to deliver to MX hosts that do not offer TLS with a trusted server certificate.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.