RFC 1869 (rfc1869) - Page 1 of 11
SMTP Service Extensions
Alternative Format: Original Text Document
Network Working Group J. Klensin, WG Chair
Request For Comments: 1869 MCI
STD: 10 N. Freed, Editor
Obsoletes: 1651 Innosoft International, Inc.
Category: Standards Track M. Rose
Dover Beach Consulting, Inc.
E. Stefferud
Network Management Associates, Inc.
D. Crocker
Brandenburg Consulting
November 1995
SMTP Service Extensions
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
1. Abstract
This memo defines a framework for extending the SMTP service by
defining a means whereby a server SMTP can inform a client SMTP as to
the service extensions it supports. Extensions to the SMTP service
are registered with the IANA. This framework does not require
modification of existing SMTP clients or servers unless the features
of the service extensions are to be requested or provided.
2. Introduction
The Simple Mail Transfer Protocol (SMTP) [1] has provided a stable,
effective basis for the relay function of message transfer agents.
Although a decade old, SMTP has proven remarkably resilient.
Nevertheless, the need for a number of protocol extensions has become
evident. Rather than describing these extensions as separate and
haphazard entities, this document enhances SMTP in a straightforward
fashion that provides a framework in which all future extensions can
be built in a single consistent way.
3. Framework for SMTP Extensions
For the purpose of service extensions to SMTP, SMTP relays a mail
object containing an envelope and a content.
Klensin, et al Standards Track