RFC 7372: Email Authentication Status Codes

This document registers code points to allow status codes to be returned to an email client to indicate that a message is being rejected or deferred…

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Outgoing relationships (1 related RFC)

Updates — RFC 7208: Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1

Incoming relationships (2 related RFCs)

Normatively referenced by — RFC 7960: Interoperability Issues between Domain-based Message Authentication, Reporting, and Conformance (DMARC) and Indirect Email Flows
Informatively referenced by — RFC 7601: Message Header Field for Indicating Message Authentication Status