RFC 8460: SMTP TLS Reporting

A number of protocols exist for establishing encrypted channels between SMTP Mail Transfer Agents (MTAs), including STARTTLS, DNS- Based Authentication of…

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Outgoing relationships (4 related RFCs)

Normative reference — RFC 7208: Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1
Normative reference — RFC 7671: The DNS-Based Authentication of Named Entities (DANE) Protocol: Updates and Operational Guidance
Normative reference — RFC 8461: SMTP MTA Strict Transport Security (MTA-STS)
Informative reference — RFC 8126: Guidelines for Writing an IANA Considerations Section in RFCs

Incoming relationships (3 related RFCs)

Normatively referenced by — RFC 8461: SMTP MTA Strict Transport Security (MTA-STS)
Informatively referenced by — RFC 9170: Long-Term Viability of Protocol Extension Mechanisms
Informatively referenced by — RFC 8904: DNS Whitelist (DNSWL) Email Authentication Method Extension