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DomainKeys Identified Mail (DKIM) and Mailing Lists
RFC 6377

Internet Engineering Task Force (IETF)                      M. Kucherawy
Request for Comments: 6377                                     Cloudmark
BCP: 167                                                  September 2011
Category: Best Current Practice
ISSN: 2070-1721

          DomainKeys Identified Mail (DKIM) and Mailing Lists

Abstract

   DomainKeys Identified Mail (DKIM) allows an ADministrative Management
   Domain (ADMD) to assume some responsibility for a message.  Based on
   deployment experience with DKIM, this document provides guidance for
   the use of DKIM with scenarios that include Mailing List Managers
   (MLMs).

Status of This Memo

   This memo documents an Internet Best Current Practice.

   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
   BCPs 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/rfc6377.

Copyright Notice

   Copyright (c) 2011 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                 Best Current Practice                 [Page 1]
RFC 6377                 DKIM and Mailing Lists           September 2011

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Background . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.2.  MLMs in Infrastructure . . . . . . . . . . . . . . . . . .  4
     1.3.  Feedback Loops and Other Bilateral Agreements  . . . . . .  5
     1.4.  Document Scope and Goals . . . . . . . . . . . . . . . . .  6
   2.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  6
     2.1.  Key Words  . . . . . . . . . . . . . . . . . . . . . . . .  6
     2.2.  Messaging Terms  . . . . . . . . . . . . . . . . . . . . .  6
     2.3.  DKIM-Specific References . . . . . . . . . . . . . . . . .  6
     2.4.  'DKIM-Friendly'  . . . . . . . . . . . . . . . . . . . . .  7
     2.5.  Message Streams  . . . . . . . . . . . . . . . . . . . . .  7
   3.  Mailing Lists and DKIM . . . . . . . . . . . . . . . . . . . .  7
     3.1.  Roles and Realities  . . . . . . . . . . . . . . . . . . .  7
     3.2.  Types of Mailing Lists . . . . . . . . . . . . . . . . . .  8
     3.3.  Current MLM Effects on Signatures  . . . . . . . . . . . . 10
   4.  Non-Participating MLMs . . . . . . . . . . . . . . . . . . . . 11
     4.1.  Author-Related Signing . . . . . . . . . . . . . . . . . . 12
     4.2.  Verification Outcomes at Receivers . . . . . . . . . . . . 12
     4.3.  Handling Choices at Receivers  . . . . . . . . . . . . . . 13
     4.4.  Wrapping a Non-Participating MLM . . . . . . . . . . . . . 13
   5.  Participating MLMs . . . . . . . . . . . . . . . . . . . . . . 13
     5.1.  General  . . . . . . . . . . . . . . . . . . . . . . . . . 13
     5.2.  DKIM Author Domain Signing Practices . . . . . . . . . . . 14
     5.3.  Subscriptions  . . . . . . . . . . . . . . . . . . . . . . 15
     5.4.  Exceptions to ADSP Recommendations . . . . . . . . . . . . 15
     5.5.  Author-Related Signing . . . . . . . . . . . . . . . . . . 16
     5.6.  Verification Outcomes at MLMs  . . . . . . . . . . . . . . 16
     5.7.  Signature Removal Issues . . . . . . . . . . . . . . . . . 17
     5.8.  MLM Signatures . . . . . . . . . . . . . . . . . . . . . . 19
     5.9.  Verification Outcomes at Final Receiving Sites . . . . . . 20
     5.10. Use with FBLs  . . . . . . . . . . . . . . . . . . . . . . 20
     5.11. Handling Choices at Receivers  . . . . . . . . . . . . . . 21
   6.  DKIM Reporting . . . . . . . . . . . . . . . . . . . . . . . . 22
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 22
     7.1.  Security Considerations from DKIM and ADSP . . . . . . . . 22
     7.2.  Authentication Results When Relaying . . . . . . . . . . . 23
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 23
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 23

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