SMTP MTA Strict Transport Security
RFC 8461, “SMTP MTA Strict Transport Security”, is a Proposed Standard document published in September 2018 by D. Margolis, M. Risher, B. Ramakrishnan, A. Brotman, J. Jones. The canonical text is published by the RFC Editor.
Abstract
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.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 8461 is hosted at rfc-editor.org. Available in TXT,HTML.
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