RFC 3848: ESMTP and LMTP Transmission Types Registration

This registers seven new mail transmission types (ESMTPA, ESMTPS, ESMTPSA, LMTP, LMTPA, LMTPS, LMTPSA) for use in the "with" clause of a Received header in an…

Read RFC 3848 on the RFC Editor

Outgoing relationships (4 related RFCs)

Normative reference — RFC 2821: Simple Mail Transfer Protocol
Normative reference — RFC 3207: SMTP Service Extension for Secure SMTP over Transport Layer Security
Normative reference — RFC 2033: Local Mail Transfer Protocol
Normative reference — RFC 2554: SMTP Service Extension for Authentication

Incoming relationships (2 related RFCs)

Normatively referenced by — RFC 6531: SMTP Extension for Internationalized Email
Informatively referenced by — RFC 8314: Cleartext Considered Obsolete: Use of Transport Layer Security (TLS) for Email Submission and Access