RFC 5518 · PROPOSED STANDARD · 2009
MON · 27 JUL 2026
Vouch By Reference
Overview
RFC 5518, “Vouch By Reference”, is a Proposed Standard document published in April 2009 by P. Hoffman, J. Levine, A. Hathcock. It has since been updated by RFC 8553. The canonical text is published by the RFC Editor.
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. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
Read this RFC
The canonical text of RFC 5518 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 2009
- RFC 5519 Multicast Group Membership Discovery MIB
- RFC 5516 Diameter Command Code Registration for the Third Generation Partnership Project Evolved Packet System
- RFC 5520 Preserving Topology Confidentiality in Inter-Domain Path Computation Using a Path-Key-Based Mechanism
- RFC 5515 Layer 2 Tunneling Protocol Access Line Information Attribute Value Pair Extensions
- RFC 5521 Extensions to the Path Computation Element Communication Protocol for Route Exclusions
- RFC 5514 IPv6 over Social Networks
- RFC 5522 Network Mobility Route Optimization Requirements for Operational Use in Aeronautics and Space Exploration Mobile Networks
- RFC 5513 IANA Considerations for Three Letter Acronyms