Extensions to DomainKeys Identified Mail (DKIM) for Failure Reporting
RFC 6651

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Internet Engineering Task Force (IETF)                      M. Kucherawy
Request for Comments: 6651                                     Cloudmark
Category: Standards Track                                      June 2012
ISSN: 2070-1721

 Extensions to DomainKeys Identified Mail (DKIM) for Failure Reporting

Abstract

   This document presents extensions to the DomainKeys Identified Mail
   (DKIM) specification to allow for detailed reporting of message
   authentication failures in an on-demand fashion.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6651.

Copyright Notice

   Copyright (c) 2012 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
   (http://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.

Kucherawy                    Standards Track                    [Page 1]
RFC 6651                DKIM Reporting Extensions              June 2012

Table of Contents

   1. Introduction ....................................................3
   2. Definitions .....................................................3
      2.1. Key Words ..................................................3
      2.2. Notation ...................................................3
      2.3. Imported Definitions .......................................3
      2.4. Other Definitions ..........................................3
   3. Optional Reporting for DKIM .....................................4
      3.1. Extension DKIM Signature Tag ...............................4
      3.2. DKIM Reporting TXT Record ..................................4
      3.3. DKIM Reporting Algorithm ...................................6
   4. Optional Reporting Address for DKIM ADSP ........................8
   5. Requested Reports ...............................................9
      5.1. Requested Reports for DKIM Failures .......................10
      5.2. Requested Reports for DKIM ADSP Failures ..................10
   6. Report Generation ..............................................11
      6.1. Report Format .............................................11
      6.2. Other Guidance ............................................11
   7. IANA Considerations ............................................11
      7.1. DKIM Signature Tag Registration ...........................11
      7.2. DKIM ADSP Tag Registration ................................12
      7.3. DKIM Reporting Tag Registry ...............................12
   8. Security Considerations ........................................13
      8.1. Inherited Considerations ..................................13
      8.2. Report Volume .............................................13
      8.3. Deliberate Misuse .........................................13
      8.4. Unreported Fraud ..........................................14
   9. References .....................................................14
      9.1. Normative References ......................................14
      9.2. Informative References ....................................15
   Appendix A. Acknowledgements ......................................16
   Appendix B. Examples ..............................................16
      B.1. Example Use of DKIM Signature Extension Tag ...............16
      B.2. Example DKIM Reporting TXT Record .........................17
      B.3. Example Use of DKIM ADSP Extension Tags ...................17

Kucherawy                    Standards Track                    [Page 2]
RFC 6651                DKIM Reporting Extensions              June 2012

1.  Introduction

   DomainKeys Identified Mail [DKIM] introduced a mechanism for message
   signing and authentication.  It uses digital signing to associate a
   domain name with a message in a reliable manner.  The verified domain
   name can then be evaluated (e.g., checking advertised sender policy,
   comparison to a known-good list, submission to a reputation service,
   etc.).