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RFC 8689
Title: SMTP Require TLS Option
Author: J. Fenton
Status: Standards Track
Stream: IETF
Date: November 2019
Mailbox: [email protected]
Pages: 16
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-uta-smtp-require-tls-09.txt
URL: https://www.rfc-editor.org/info/rfc8689
DOI: 10.17487/RFC8689
The SMTP STARTTLS option, used in negotiating transport-level
encryption of SMTP connections, is not as useful from a security
standpoint as it might be because of its opportunistic nature;
message delivery is, by default, prioritized over security. This
document describes an SMTP service extension, REQUIRETLS, and a
message header field, TLS-Required. If the REQUIRETLS option or
TLS-Required message header field is used when sending a message, it
asserts a request on the part of the message sender to override the
default negotiation of TLS, either by requiring that TLS be
negotiated when the message is relayed or by requesting that
recipient-side policy mechanisms such as MTA-STS and DNS-Based
Authentication of Named Entities (DANE) be ignored when relaying a
message for which security is unimportant.
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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