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DomainKeys Identified Mail (DKIM) Development, Deployment, and Operations
RFC 5863

Internet Engineering Task Force (IETF)                         T. Hansen
Request for Comments: 5863                             AT&T Laboratories
Category: Informational                                        E. Siegel
ISSN: 2070-1721                                               Consultant
                                                         P. Hallam-Baker
                                             Default Deny Security, Inc.
                                                              D. Crocker
                                             Brandenburg InternetWorking
                                                                May 2010

                   DomainKeys Identified Mail (DKIM)
                Development, Deployment, and Operations

Abstract

   DomainKeys Identified Mail (DKIM) allows an organization to claim
   responsibility for transmitting a message, in a way that can be
   validated by a recipient.  The organization can be the author's, the
   originating sending site, an intermediary, or one of their agents.  A
   message can contain multiple signatures, from the same or different
   organizations involved with the message.  DKIM defines a domain-level
   digital signature authentication framework for email, using public
   key cryptography and using the domain name service as its key server
   technology.  This permits verification of a responsible organization,
   as well as the integrity of the message content.  DKIM will also
   provide a mechanism that permits potential email signers to publish
   information about their email signing practices; this will permit
   email receivers to make additional assessments about messages.
   DKIM's authentication of email identity can assist in the global
   control of "spam" and "phishing".  This document provides
   implementation, deployment, operational, and migration considerations
   for DKIM.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

Hansen, et al.                Informational                     [Page 1]
RFC 5863         DKIM Development/Deployment/Operations         May 2010

   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/rfc5863.

Copyright Notice

   Copyright (c) 2010 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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................4
   2. Using DKIM as Part of Trust Assessment ..........................4
      2.1. A Systems View of Email Trust Assessment ...................4
      2.2. Choosing a DKIM Tag for the Assessment Identifier ..........6
      2.3. Choosing the Signing Domain Name ...........................8
      2.4. Recipient-Based Assessments ...............................10
      2.5. Filtering .................................................12
   3. DKIM Key Generation, Storage, and Management ...................15
      3.1. Private Key Management: Deployment and Ongoing

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