Vouch By Reference
RFC 5518
Document | Type |
RFC - Proposed Standard
(April 2009; Errata)
Updated by RFC 8553
Was draft-hoffman-dac-vbr (individual in gen area)
|
|
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Authors | Arvel Hathcock , John Levine , Paul Hoffman | ||
Last updated | 2020-01-21 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized with errata bibtex | ||
Reviews | |||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 5518 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Russ Housley | ||
Send notices to | (None) |
Network Working Group P. Hoffman Request for Comments: 5518 J. Levine Category: Standards Track Domain Assurance Council A. Hathcock Alt-N Technologies April 2009 Vouch By Reference Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (c) 2009 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 in effect on the date of publication of this document (http://trustee.ietf.org/license-info). Please review these documents carefully, as they describe your rights and restrictions with respect to this document. 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. Abstract This document describes the Vouch By Reference (VBR) protocol. VBR is a protocol for adding third-party certification to email. It permits independent third parties to certify the owner of a domain name that is associated with received mail. Hoffman, et al. Standards Track [Page 1] RFC 5518 VBR April 2009 Table of Contents 1. Introduction ....................................................3 1.1. Definitions ................................................4 2. Use of the VBR-Info Header Field ................................4 3. Validation Process ..............................................4 4. The VBR-Info Header Field .......................................5 4.1. Syntax of VBR-Info Header Fields ...........................5 5. DNS Query .......................................................6 6. Types of Message Content ........................................7 6.1. All ........................................................8 6.2. List .......................................................8 6.3. Transaction ................................................8 7. Obtaining a Useful Domain Name ..................................8 7.1. DKIM .......................................................8 7.2. DomainKeys .................................................9 7.3. SPF ........................................................9 7.4. Sender ID .................................................10 8. Security Considerations ........................................10 9. IANA Considerations ............................................10 10. References ....................................................11 10.1. Normative References .....................................11 10.2. Informative References ...................................11 Appendix A. Acknowledgements .....................................12 Hoffman, et al. Standards Track [Page 2] RFC 5518 VBR April 2009 1. Introduction Vouch By Reference, or VBR, is a protocol for adding third-party certification to email. Specifically, VBR permits independent third parties to certify the owner of a domain name that is associated with received mail. VBR may be performed anywhere along the email transit path, by any capable receiving module, either within the handling service or by end-user software. VBR accomplishes this with a two-part protocol: o In the first part, a sender affixes VBR information to email messages. The VBR information says which domain certification services the sender believes will vouch for email traffic associated with that sender. o In the second part, the receiver queries one or more certificationShow full document text