JMAP R. Ouazana, Ed.
Internet-Draft Linagora
Intended status: Standards Track December 16, 2019
Expires: June 18, 2020

Handling Message Disposition Notification with JMAP
draft-ietf-jmap-mdn-04

Abstract

This document specifies a data model for handling [RFC8098] MDN messages with a server using JMAP.

Status of This Memo

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

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Copyright Notice

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Table of Contents

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 aims to provide a consistent interface to different data types.

MDN are defined in [RFC8098] and are used as "read receipts", "acknowledgements", or "receipt notifications".

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

  1. When receiving an email, an MDN can be sent to the sender. This specification defines an MDN/set method to cover this case.
  2. When sending an email, 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.
  3. When receiving an MDN, the MDN could be related to an existing sent mail. This is already covered by [RFC8621] in the EmailSubmission object. Client could want to display detailed information about a received MDN. This specification defines a 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.

1.3. Addition to the capabilities object

Capabilities are announced as part of the standard JMAP Session resource; see [RFC8620], section 2.

Support for the "MDN" data type and the "MDN/parse" method are represented by the capability "urn:ietf:params:jmap:mdn" being present in the "capabilities" property. The capability "urn:ietf:params:jmap:mdn" being present in the "accountCapabilities" property of an account represents support for creating and sending MDN messages via the "MDN/set" 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 both the JMAP session "capabilities" property and an account's "accountCapabilities" property.

2. MDN

An MDN object has the following properties:

A Disposition object has the following properties:

See [RFC8098] for the exact meaning of these different fields.

2.1. MDN/set

This is a standard “/set” method as described in [RFC8620] where only create is supported; any attempt to update/destroy MUST be rejected with a forbidden SetError.

The MDN/set method generates and sends an [RFC5322] message from an MDN object.

The client SHOULD NOT issue a MDN/set request if the message has the $MDNSent keyword set. In this case, the server MUST reject the submission with a standard alreadyExists SetError.

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

After all items in the "MDN/set" invocation have been processed, a single implicit "Email/set" call MUST be made to set the "$MDNSent" keyword on "Email" objects referenced by "MDN" objects that have been successfully created (see [RFC3503] for more details). The response to this MUST be returned after the "MDN/set" response.

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 the client could expect to be an MDN.

The "forEmailId" property can be null or missing if the "originalMessageId" property is missing or not referencing an existing email.

The MDN/parse method takes the following arguments:

The response has the following arguments:

3. Samples

3.1. Sending an MDN for a received email

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

[[ "MDN/set", {
  "accountId": "ue150411c",
  "create": {
    "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": "linagora.com; OpenPaaS",
      "disposition": {
        "actionMode": "manual-action",
        "sendingMode": "MDN-sent-manually",
        "type": "displayed"
      }
    }
  }
}, "0" ]]

If the email id matches an existing email without the $MDNSent keyword, the server can answer:

[[ "MDN/set", {
  "accountId": "ue150411c",
  "oldState": "012421s6-8nrq-4ps4-n0p4-9330r951ns21",
  "newState": "355421f6-8aed-4cf4-a0c4-7377e951af36",
  "created": {
    "k1546": {
      "finalRecipient": "rfc822; john@example.com",
      "originalMessageId": "<1521557867.2614.0.camel@apache.org>"
    }
  }
}, "0" ],

3.2. Asking for MDN when sending an email

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

[[ "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": "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 email).

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:

[[ "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": "linagora.com; OpenPaaS",
      "disposition": {
        "actionMode": "manual-action",
        "sendingMode": "MDN-sent-manually",
        "type": "displayed"
      }
      "finalRecipient": "rfc822; john@example.com",
      "originalMessageId": "<1521557867.2614.0.camel@apache.org>"
    }
  }
}, "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

Change Controller: IETF

Security and privacy considerations: this document, section 5.

5. Security considerations

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

6. References

6.1. 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.
[RFC3503] Melnikov, A., "Message Disposition Notification (MDN) profile for Internet Message Access Protocol (IMAP)", RFC 3503, DOI 10.17487/RFC3503, March 2003.
[RFC5322] Resnick, P., "Internet Message Format", RFC 5322, DOI 10.17487/RFC5322, October 2008.
[RFC8098] Hansen, T. and A. Melnikov, "Message Disposition Notification", STD 85, RFC 8098, DOI 10.17487/RFC8098, February 2017.
[RFC8620] Jenkins, N. and C. Newman, "The JSON Meta Application Protocol (JMAP)", RFC 8620, DOI 10.17487/RFC8620, July 2019.
[RFC8621] Jenkins, N. and C. Newman, "The JSON Meta Application Protocol (JMAP) for Mail", RFC 8621, DOI 10.17487/RFC8621, August 2019.

6.2. Informative References

[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017.

Author's Address

Raphaël Ouazana (editor) Linagora 100 Terrasse Boieldieu – Tour Franklin Paris - La Défense CEDEX, 92042 France EMail: rouazana@linagora.com URI: https://www.linagora.com