Applicability Statement for IETF Core Email Protocols
draft-klensin-email-core-as-00

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Last updated 2020-03-30
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Network Working Group                                    J. Klensin, Ed.
Internet-Draft                                            March 30, 2020
Intended status: Standards Track
Expires: October 1, 2020

         Applicability Statement for IETF Core Email Protocols
                    draft-klensin-email-core-as-00

Abstract

   Electronic mail is one of the oldest Internet applications that is
   still in very active use.  While the basic protocols and formats for
   mail transport and message formats have evolved slowly over the
   years, events and thinking in more recent years have supplemented
   those core protocols with additional features and suggestions for
   their use.  This Applicability Statement describes the relationship
   among many of those protocols and provides guidance and makes
   recommendations for the use of features of the core protocols.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on October 1, 2020.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Applicability of Some SMTP Provisions . . . . . . . . . . . .   3
   3.  Applicability of Message Format Provisions  . . . . . . . . .   3
   4.  MIME and Its Implications . . . . . . . . . . . . . . . . . .   3
   5.  Other Stuff . . . . . . . . . . . . . . . . . . . . . . . . .   4
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   4
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   In its current form, this draft is a placeholder and beginning of an
   outline for the Applicability Statement that has been discussed as a
   complement for proposed revisions of the base protocol specifications
   for SMTP [RFC5321] (being revised as ID.RFC5321bis [ID.RFC5321bis])
   and Internet Message Format [RFC5322] (being revised as ID.RFC5322bis
   [ID.RFC5322bis]).  Among other things, it is expected to capture
   topics that a potential WG concludes are important but that should
   not become part of those core documents.

   As discussed in RFC 2026 [RFC2026],

      "An Applicability Statement specifies how, and under what
      circumstances, one or more TSs may be applied to support a
      particular Internet capability."

   That form of a standards track document is appropriate because one of
   the roles of such a document is to explain the relationship among
   technical specification, describe how they are used together, and
   make statements about what is "required, recommended, or elective".

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119] and
   RFC 8174 [RFC8174].

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2.  Applicability of Some SMTP Provisions

   Over the years since RFC 5321 was published in October 2008, usage of
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