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JMAP                                                     R. Ouazana, Ed.
Internet-Draft                                                  Linagora
Intended status: Standards Track                           July 27, 2020
Expires: January 28, 2021


          Handling Message Disposition Notification with JMAP
                         draft-ietf-jmap-mdn-15

Abstract

   This document specifies a data model for handling Message Disposition
   Notifications (MDNs, RFC 8098) in the JSON Meta Application Protocol
   (JMAP, RFCs 8620 and 8621).

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 28, 2021.

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
   to this document.  Code Components extracted from this document must
   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.





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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Notational conventions  . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.3.  Addition to the capabilities object . . . . . . . . . . .   3
   2.  MDN . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  MDN/send  . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  MDN/parse . . . . . . . . . . . . . . . . . . . . . . . .   7
   3.  Samples . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     3.1.  Sending an MDN for a received email message . . . . . . .   8
     3.2.  Asking for MDN when sending an email message  . . . . . .   9
     3.3.  Parsing a received MDN  . . . . . . . . . . . . . . . . .  10
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
     4.1.  JMAP Capability Registration for "mdn"  . . . . . . . . .  11
     4.2.  JMAP Error Codes Registry . . . . . . . . . . . . . . . .  12
   5.  Security considerations . . . . . . . . . . . . . . . . . . .  12
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .  12
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   JMAP ([RFC8620] - JSON Meta Application Protocol) is a generic
   protocol for synchronising data, such as mail, calendars or contacts,
   between a client and a server.  It is optimised for mobile and web
   environments, and provides a consistent interface to different data
   types.

   JMAP for Mail ([RFC8621] - The JSON Meta Application Protocol (JMAP)
   for Mail) specifies a data model for synchronising email data with a
   server using JMAP.  Clients can use this to efficiently search,
   access, organise, and send messages.

   Message Disposition Notifications (MDNs) are defined in [RFC8098] and
   are used as "read receipts", "acknowledgements", or "receipt
   notifications".

   A client can have to deal with MDNs in different ways:

   1.  When receiving an email message, an MDN can be sent to the
       sender.  This specification defines an MDN/send method to cover
       this case.

   2.  When sending an email message, an MDN can be requested.  This
       must be done with the help of a header, and is already specified
       by [RFC8098] and can already be handled by [RFC8621] this way.





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   3.  When receiving an MDN, the MDN could be related to an existing
       sent message.  This is already covered by [RFC8621] in the
       EmailSubmission object.  A client might want to display detailed
       information about a received MDN.  This specification defines an
       MDN/parse method to cover this case.

1.1.  Notational conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

   Type signatures, examples and property descriptions in this document
   follow the conventions established in section 1.1 of [RFC8620].  Data
   types defined in the core specification are also used in this
   document.

   Servers MUST support all properties specified for the new data types
   defined in this document.

1.2.  Terminology

   The same terminology is used in this document as in the core JMAP
   specification.

   Because keywords are case-insensitive in IMAP but case-sensitive in
   JMAP, the "$mdnsent" keyword MUST always be used in lowercase.

1.3.  Addition to the capabilities object

   Capabilities are announced as part of the standard JMAP Session
   resource; see [RFC8620], section 2.  This defines a new capability,
   "urn:ietf:params:jmap:mdn".

   The capability "urn:ietf:params:jmap:mdn" being present in the
   "accountCapabilities" property of an account represents support for
   the "MDN" data type, parsing MDNs via the "MDN/parse" method, and
   creating and sending MDN messages via the "MDN/send" method.  Servers
   that include the capability in one or more "accountCapabilities"
   properties MUST also include the property in the "capabilities"
   property.

   The value of this "urn:ietf:params:jmap:mdn" property is an empty
   object in the account's "accountCapabilities" property.





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2.  MDN

   An *MDN* object has the following properties:

   o  forEmailId: "Id|null" Email Id of the received message this MDN is
      relative to.  This property MUST NOT be null for "MDN/send", but
      may be null in the response from the "MDN/parse" method.

   o  subject: "String|null" Subject used as "Subject" header for this
      MDN.

   o  textBody: "String|null" Human readable part of the MDN, as plain
      text.

   o  includeOriginalMessage: "Boolean" (default: false).  If "true",
      the content of the original message will appear in the third
      component of the multipart/report generated for the MDN.  See
      [RFC8098] for details and security considerations.

   o  reportingUA: "String|null" Name of the MUA creating this MDN.  It
      is used to build the MDN Report part of the MDN.

   o  disposition: "Disposition" Object containing the diverse MDN
      disposition options.

   o  mdnGateway: "String|null" (server-set) Name of the gateway or MTA
      that translated a foreign (non-Internet) message disposition
      notification into this MDN.

   o  originalRecipient: "String|null" (server-set) Original recipient
      address as specified by the sender of the message for which the
      MDN is being issued.

   o  finalRecipient: "String|null" Recipient for which the MDN is being
      issued.  if set, it overrides the value that would be calculated
      by the server from the Identity.

   o  originalMessageId: "String|null" (server-set) Message-ID (the
      [RFC5322] header field, not the JMAP Id) of the message for which
      the MDN is being issued.

   o  error: "String[]|null" (server-set) Additional information in the
      form of text messages when the "error" disposition modifier
      appears.

   o  extensionFields: "String[String]|null" Object where keys are
      extension-field names and values are extension-field values.




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   A *Disposition* object has the following properties:

   o  actionMode: "String" This MUST be one of the following strings:
      "manual-action" / "automatic-action"

   o  sendingMode: "String" This MUST be one of the following strings:
      "mdn-sent-manually" / "mdn-sent-automatically"

   o  type: "String" This MUST be one of the following strings:
      "deleted" / "dispatched" / "displayed" / "processed"

   See [RFC8098] for the exact meaning of these different fields.  These
   fields are defined case insensitive in [RFC8098] but are case
   sensitive in this RFC and MUST be converted to lowercase by "MDN/
   parse".

2.1.  MDN/send

   The MDN/send method sends an [RFC5322] message from an MDN object.
   When calling this method the "using" property of the Request object
   MUST contain the capabilities "urn:ietf:params:jmap:mdn" and
   "urn:ietf:params:jmap:mail".  The latter because of the implicit call
   to Email/set and the use of Identities, described below.  The method
   takes the following arguments:

   o  accountId: "Id" The id of the account to use.

   o  identityId: "Id" The id of the Identity to associate with these
      MDNs.  The server will use this identity to define the sender of
      the MDNs and to set the finalRecipient field.

   o  send: "Id[MDN]" A map of creation id (client specified) to MDN
      objects.

   o  onSuccessUpdateEmail: "Id[PatchObject]|null" A map of id to an
      object containing properties to update on the Email object
      referenced by the "MDN/send" if the sending succeeds.  This will
      always be a backward reference to the creation id (see example
      below in Section 3.1).

   The response has the following arguments:

   o  accountId: "Id" The id of the account used for the call.

   o  sent: "Id[MDN]|null" A map of creation id to MDN containing any
      properties that were not set by the client.  This includes any
      properties that were omitted by the client and thus set to a




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      default by the server.  This argument is null if no MDN objects
      were successfully sent.

   o  notSent: "Id[SetError]|null" A map of the creation id to a
      SetError object for each record that failed to be sent, or null if
      all successful.

   The following already registered SetError would mean:

   o  notFound: The reference Email Id cannot be found, or has no valid
      "Disposition-Notification-To" header.

   o  forbidden: MDN/send would violate an ACL or other permissions
      policy.

   o  forbiddenFrom: The user is not allowed to use the given
      finalRecipient property.

   o  overQuota: MDN/send would exceed a server-defined limit on the
      number or total size of sent MDNs.  It could include limitations
      on sent messages.

   o  tooLarge: MDN/send would result in an MDN that exceeds a server-
      defined limit for the maximum size of an MDN, or more generally on
      email message.

   o  rateLimit: Too many MDNs or email messages have been created
      recently, and a server-defined rate limit has been reached.  It
      may work if tried again later.

   o  invalidProperties: The record given is invalid in some way.

   The following is a new SetError:

   o  mdnAlreadySent: The message has the "$mdnsent" keyword already
      set.

   If the accountId or identityId given cannot be found, the method call
   is rejected with an "invalidArguments" error.

   The client MUST NOT issue an MDN/send request if the message has the
   "$mdnsent" keyword set.

   When sending the MDN, the server is in charge of generating the
   "originalRecipient", "finalRecipient" and "originalMessageId" fields
   according to the [RFC8098] specification.





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   The client is expected to explicitly update each "Email" for which an
   "MDN/send" has been invoked in order to set the "$mdnsent" keyword on
   these messages.  To ensure that, the server MUST reject an "MDN/send"
   which does not result in setting the keyword "$mdnsent".  Thus the
   server MUST check that the "onSuccessUpdateEmail" property of the
   method is correctly set to update this keyword.

2.2.  MDN/parse

   This method allows a client to parse blobs as [RFC5322] messages to
   get MDN objects.  This can be used to parse and get detailed
   information about blobs referenced in the "mdnBlobIds" of the
   EmailSubmission object, or any email message the client could expect
   to be an MDN.

   The "forEmailId" property can be null or missing if the
   "originalMessageId" property is missing or does not refer to an
   existing message, or if the server cannot efficiently calculate the
   related message (for example, if several messages get the same
   "Message-Id" header).

   The MDN/parse method takes the following arguments:

   o  accountId: "Id" The id of the account to use.

   o  blobIds: "Id[]" The ids of the blobs to parse.

   The response has the following arguments:

   o  accountId: "Id" The id of the account used for the call.

   o  parsed: "Id[MDN]|null" A map of blob id to parsed MDN
      representation for each successfully parsed blob, or null if none.

   o  notParsable: "Id[]|null" A list of ids given that corresponded to
      blobs that could not be parsed as MDNs, or null if none.

   o  notFound: "Id[]|null" A list of blob ids given that could not be
      found, or null if none.

   The following additional errors may be returned instead of the MDN/
   parse response:

   o  requestTooLarge: The number of ids requested by the client exceeds
      the maximum number the server is willing to process in a single
      method call.





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   o  invalidArguments: If the accountId given cannot be found, the MDN
      parsing is rejected with an "invalidArguments" error.

3.  Samples

3.1.  Sending an MDN for a received email message

   A client can use the following request to send an MDN back to the
   sender:

       [[ "MDN/send", {
         "accountId": "ue150411c",
         "identityId": "I64588216",
         "send": {
           "k1546": {
             "forEmailId": "Md45b47b4877521042cec0938",
             "subject": "Read receipt for: World domination",
             "textBody": "This receipt shows that the email has been
                 displayed on your recipient's computer. There is no
                 guaranty it has been read or understood.",
             "reportingUA": "joes-pc.cs.example.com; Foomail 97.1",
             "disposition": {
               "actionMode": "manual-action",
               "sendingMode": "mdn-sent-manually",
               "type": "displayed"
             },
             "extension": {
               "X-EXTENSION-EXAMPLE": "example.com"
             }
           }
         },
         "onSuccessUpdateEmail": {
           "#k1546": {
             "keywords/$mdnsent": true
           }
         }
       }, "0" ]]

   If the email id matches an existing email message without the
   "$mdnsent" keyword, the server can answer:











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       [[ "MDN/send", {
         "accountId": "ue150411c",
         "sent": {
           "k1546": {
             "finalRecipient": "rfc822; john@example.com",
             "originalMessageId": "<199509192301.23456@example.org>"
           }
         }
       }, "0" ],
       [ "Email/set", {
         "accountId": "ue150411c",
         "oldState": "23",
         "newState": "42",
         "updated": {
           "Md45b47b4877521042cec0938": {}
         }
       }, "0" ]]

   If the "$mdnsent" keyword has already been set, the server can answer
   an error:

        [[ "MDN/send", {
          "accountId": "ue150411c",
          "notSent": {
            "k1546": {
              "type": "mdnAlreadySent",
              "description" : "$mdnsent keyword is already present"
            }
          }
        }, "0" ]]

3.2.  Asking for MDN when sending an email message

   This is done with the [RFC8621] "Email/set" "create" method.

















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   [[ "Email/set", {
     "accountId": "ue150411c",
     "create": {
       "k1546": {
         "mailboxIds": {
           "2ea1ca41b38e": true
         },
         "keywords": {
           "$seen": true,
           "$draft": true
         },
         "from": [{
           "name": "Joe Bloggs",
           "email": "joe@example.com"
         }],
         "to": [{
           "name": "John",
           "email": "john@example.com"
         }],
         "header:Disposition-Notification-To:asText": "joe@example.com",
         "subject": "World domination",
         ...
       }
     }
   }, "0" ]]

   Note the specified "Disposition-Notification-To" header indicating
   where to send MDN back (usually the sender of the message).

3.3.  Parsing a received MDN

   The client issues a parse request:

          [[ "MDN/parse", {
            "accountId": "ue150411c",
            "blobIds": [ "0f9f65ab-dc7b-4146-850f-6e4881093965" ]
          }, "0" ]]

   The server responds:












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       [[ "MDN/parse", {
         "accountId": "ue150411c",
         "parsed": {
           "0f9f65ab-dc7b-4146-850f-6e4881093965": {
             "forEmailId": "Md45b47b4877521042cec0938",
             "subject": "Read receipt for: World domination",
             "textBody": "This receipt shows that the email has been
                 displayed on your recipient's computer. There is no
                 guaranty it has been read or understood.",
             "reportingUA": "joes-pc.cs.example.com; Foomail 97.1",
             "disposition": {
               "actionMode": "manual-action",
               "sendingMode": "mdn-sent-manually",
               "type": "displayed"
             },
             "finalRecipient": "rfc822; john@example.com",
             "originalMessageId": "<199509192301.23456@example.org>"
           }
         }
       }, "0" ]]

   In case of a not found blobId, the server would respond:

         [[ "MDN/parse", {
           "accountId": "ue150411c",
           "notFound": [ "0f9f65ab-dc7b-4146-850f-6e4881093965" ]
         }, "0" ]]

   If the blobId has been found but is not parsable, the server would
   respond:

        [[ "MDN/parse", {
          "accountId": "ue150411c",
          "notParsable": [ "0f9f65ab-dc7b-4146-850f-6e4881093965" ]
        }, "0" ]]

4.  IANA Considerations

4.1.  JMAP Capability Registration for "mdn"

   IANA will register the "mdn" JMAP Capability as follows:

   Capability Name: "urn:ietf:params:jmap:mdn"

   Specification document: this document

   Intended use: common




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   Change Controller: IETF

   Security and privacy considerations: this document, section 5.

4.2.  JMAP Error Codes Registry

   This section registers one new error code in the "JMAP Error Codes"
   registry, as defined in [RFC8620].

   JMAP Error Code: mdnAlreadySent

   Intended use: common

   Change controller: IETF

   Reference: This document, Section 2.1

   Description: The message has the "$mdnsent" keyword already set.  The
   client MUST NOT try again to send an MDN for this message.

5.  Security considerations

   The same considerations regarding MDN (see [RFC8098] and [RFC3503])
   apply to this document.

   In order to enforce trust regarding the relation between the user
   sending an email message and the identity of this user, the server
   SHOULD validate in conformance to the provided Identity that the user
   is permitted to use the finalRecipient value and return a
   forbiddenFrom error if not.

6.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC3503]  Melnikov, A., "Message Disposition Notification (MDN)
              profile for Internet Message Access Protocol (IMAP)",
              RFC 3503, DOI 10.17487/RFC3503, March 2003,
              <https://www.rfc-editor.org/info/rfc3503>.

   [RFC5322]  Resnick, P., Ed., "Internet Message Format", RFC 5322,
              DOI 10.17487/RFC5322, October 2008,
              <https://www.rfc-editor.org/info/rfc5322>.





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   [RFC8098]  Hansen, T., Ed. and A. Melnikov, Ed., "Message Disposition
              Notification", STD 85, RFC 8098, DOI 10.17487/RFC8098,
              February 2017, <https://www.rfc-editor.org/info/rfc8098>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8620]  Jenkins, N. and C. Newman, "The JSON Meta Application
              Protocol (JMAP)", RFC 8620, DOI 10.17487/RFC8620, July
              2019, <https://www.rfc-editor.org/info/rfc8620>.

   [RFC8621]  Jenkins, N. and C. Newman, "The JSON Meta Application
              Protocol (JMAP) for Mail", RFC 8621, DOI 10.17487/RFC8621,
              August 2019, <https://www.rfc-editor.org/info/rfc8621>.

Author's Address

   Raphael Ouazana (editor)
   Linagora
   100 Terrasse Boieldieu - Tour Franklin
   Paris - La Defense CEDEX  92042
   France

   Email: rouazana@linagora.com
   URI:   https://www.linagora.com

























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