RFC 8904 · INFORMATIONAL · 2020
SUN · 14 JUN 2026
DNS Whitelist Email Authentication Method Extension
Overview
RFC 8904, “DNS Whitelist Email Authentication Method Extension”, is an Informational document published in September 2020 by A. Vesely. The canonical text is published by the RFC Editor.
Abstract
This document describes an email authentication method compliant with RFC 8601. The method consists of looking up the sender's IP address in a DNS whitelist. This document provides information in case the method is seen in the field, suggests a useful practice, and registers the relevant keywords.
This document does not consider blacklists.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
Read this RFC
The canonical text of RFC 8904 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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- RFC 8902 TLS Authentication Using Intelligent Transport System Certificates
- RFC 8906 A Common Operational Problem in DNS Servers: Failure to Communicate
- RFC 8901 Multi-Signer DNSSEC Models
- RFC 8907 The Terminal Access Controller Access-Control System Plus Protocol
- RFC 8900 IP Fragmentation Considered Fragile
- RFC 8908 Captive Portal API
- RFC 8899 Packetization Layer Path MTU Discovery for Datagram Transports