RFC 3207: SMTP Service Extension for Secure SMTP over Transport Layer Security

This document describes an extension to the SMTP (Simple Mail Transfer Protocol) service that allows an SMTP server and client to use TLS (Transport Layer…

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Outgoing relationships (1 related RFC)

Obsoletes — RFC 2487: SMTP Service Extension for Secure SMTP over TLS

Incoming relationships (30 related RFCs)

Updated by, Normatively referenced by — RFC 7817: Updated Transport Layer Security (TLS) Server Identity Check Procedure for Email-Related Protocols
Normatively referenced by — RFC 7435: Opportunistic Security: Some Protection Most of the Time
Normatively referenced by — RFC 4954: SMTP Service Extension for Authentication
Normatively referenced by — RFC 6186: Use of SRV Records for Locating Email Submission/Access Services
Normatively referenced by — RFC 7672: SMTP Security via Opportunistic DNS-Based Authentication of Named Entities (DANE) Transport Layer Security (TLS)
Normatively referenced by — RFC 4550: Internet Email to Support Diverse Service Environments (Lemonade) Profile
Normatively referenced by — RFC 8314: Cleartext Considered Obsolete: Use of Transport Layer Security (TLS) for Email Submission and Access
Normatively referenced by — RFC 3848: ESMTP and LMTP Transmission Types Registration
Normatively referenced by — RFC 8689: SMTP Require TLS Option
Normatively referenced by — RFC 5550: The Internet Email to Support Diverse Service Environments (Lemonade) Profile
Normatively referenced by — RFC 6109: La Posta Elettronica Certificata - Italian Certified Electronic Mail
Informatively referenced by — RFC 6125: Representation and Verification of Domain-Based Application Service Identity within Internet Public Key Infrastructure Using X.509 (PKIX) Certificates in the Context of Transport Layer Security (TLS)
Informatively referenced by — RFC 5598: Internet Mail Architecture
Informatively referenced by — RFC 4409: Message Submission for Mail
Informatively referenced by — RFC 6409: Message Submission for Mail
Informatively referenced by — RFC 6531: SMTP Extension for Internationalized Email
Informatively referenced by — RFC 3887: Message Tracking Query Protocol
Informatively referenced by — RFC 4642: Using Transport Layer Security (TLS) with Network News Transfer Protocol (NNTP)
Informatively referenced by — RFC 5336: SMTP Extension for Internationalized Email Addresses
Informatively referenced by — RFC 4217: Securing FTP with TLS
Informatively referenced by — RFC 8744: Issues and Requirements for Server Name Identification (SNI) Encryption in TLS
Informatively referenced by — RFC 9623: Implementing Interfaces to Transport Services
Informatively referenced by — RFC 6394: Use Cases and Requirements for DNS-Based Authentication of Named Entities (DANE)
Informatively referenced by — RFC 6710: Simple Mail Transfer Protocol Extension for Message Transfer Priorities
Informatively referenced by — RFC 9787: Guidance on End-to-End Email Security
Informatively referenced by — RFC 10003: Certificate Management over CMS (CMC): Transport Protocols
Informatively referenced by — RFC 6758: Tunneling of SMTP Message Transfer Priorities
Informatively referenced by — RFC 7165: Use Cases and Requirements for JSON Object Signing and Encryption (JOSE)
Informatively referenced by — RFC 7508: Securing Header Fields with S/MIME
Informatively referenced by — RFC 9422: The LIMITS SMTP Service Extension