Signalling one-click functionality for list email headers
draft-levine-herkula-oneclick-10

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Last updated 2017-01-20 (latest revision 2016-12-01)
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Network Working Group                                          J. Levine
Internet-Draft                                      Taughannock Networks
Intended status: Standards Track                              T. Herkula
Expires: June 4, 2017                                        optivo GmbH
                                                        December 1, 2016

       Signalling one-click functionality for list email headers
                    draft-levine-herkula-oneclick-10

Abstract

   This document describes a method for signaling a one-click function
   for the List-Unsubscribe email header field.  The need for this
   arises out of the actuality that mail software sometimes fetches URLs
   in mail header fields, and thereby accidentally triggers
   unsubscriptions in the case of the List-Unsubscribe header field.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on June 4, 2017.

Copyright Notice

   Copyright (c) 2016 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
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   include Simplified BSD License text as described in Section 4.e of

Levine & Herkula          Expires June 4, 2017                  [Page 1]
Internet-Draft            One click unsubscribe            December 2016

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction and Motivation . . . . . . . . . . . . . . . . .   2
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Implementation  . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Mail senders  . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Mail receivers  . . . . . . . . . . . . . . . . . . . . .   5
   4.  Additional Requirements . . . . . . . . . . . . . . . . . . .   5
   5.  Header Syntax . . . . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   8.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.1.  Simple  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.2.  Complex . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.3.  Complex with multipart/form-data  . . . . . . . . . . . .   8
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Appendix A.  Change Log . . . . . . . . . . . . . . . . . . . . .   9
     A.1.  Changes from -09 to -10 . . . . . . . . . . . . . . . . .   9
     A.2.  Changes from -08 to -09 . . . . . . . . . . . . . . . . .   9
     A.3.  Changes from -07 to -08 . . . . . . . . . . . . . . . . .   9
     A.4.  Changes from -06 to -07 . . . . . . . . . . . . . . . . .   9
     A.5.  Changes from -05 to -06 . . . . . . . . . . . . . . . . .   9
     A.6.  Changes from -04 to -05 . . . . . . . . . . . . . . . . .  10
     A.7.  Changes from -03 to -04 . . . . . . . . . . . . . . . . .  10
     A.8.  Changes from -02 to -03 . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction and Motivation

   An [RFC2369] List-Unsubscribe email header field can contain HTTPS
   [RFC7230] URIs.  In that header field the HTTPS URI is intended to
   unsubscribe the recipient of the message from the list.  But anti-
   spam software often fetches all resources in mail header fields
   automatically, without any action by the user, and there is no
   mechanical way for a sender to tell whether a request was made
   automatically by anti-spam software or manually requested by a user.
   To prevent accidental unsubscriptions, senders return landing pages
   with a confirmation step to finish the unsubscribe request.  A live
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