A new Request for Comments is now available in online RFC libraries.
RFC 8461
Title: SMTP MTA Strict Transport Security
(MTA-STS)
Author: D. Margolis,
M. Risher,
B. Ramakrishnan,
A. Brotman,
J. Jones
Status: Standards Track
Stream: IETF
Date: September 2018
Mailbox: dmargolis@google.com,
risher@google.com,
prbinu@yahoo.com,
alex_brotman@comcast.com,
janet.jones@microsoft.com
Pages: 29
Characters: 59461
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-uta-mta-sts-21.txt
URL: https://www.rfc-editor.org/info/rfc8461
DOI: 10.17487/RFC8461
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.
This document is a product of the Using TLS in Applications Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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