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ESMTP and LMTP Transmission Types Registration (RFC3848)

IP.com Disclosure Number: IPCOM000029997D
Original Publication Date: 2004-Jul-01
Included in the Prior Art Database: 2004-Jul-22
Document File: 5 page(s) / 8K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

C. Newman: AUTHOR

Abstract

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 Internet message.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 36% of the total text.

Network Working Group                                          C. Newman

Request for Comments: 3848                              Sun Microsystems

Category: Standards Track                                      July 2004

            ESMTP and LMTP Transmission Types Registration

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.

Copyright Notice

   Copyright (C) The Internet Society (2004).

Abstract

   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 Internet message.

1.  IANA Considerations

   As directed by SMTP [2], IANA maintains a registry [7] of "WITH

   protocol types" for use in the "with" clause of the Received header

   in an Internet message.  This registry presently includes SMTP [6],

   and ESMTP [2].  This specification updates the registry as follows:

   o  The new keyword "ESMTPA" indicates the use of ESMTP when the SMTP

      AUTH [3] extension is also used and authentication is successfully

      achieved.

   o  The new keyword "ESMTPS" indicates the use of ESMTP when STARTTLS

      [1] is also successfully negotiated to provide a strong transport

      encryption layer.

   o  The new keyword "ESMTPSA" indicates the use of ESMTP when both

      STARTTLS and SMTP AUTH are successfully negotiated (the

      combination of ESMTPS and ESMTPA).

   o  The new keyword "LMTP" indicates the use of LMTP [4].

Newman                      Standards Track                     [Page 1]

RFC 3848     ESMTP and LMTP Transmission Types Registration    July 2004

   o  The new keyword "LMTPA" indicates the use of LMTP when the SMTP

      AUTH extension is also used and authentication is successfully

      achieved.

   o  The new keyword "LMTPS" indicates the use of LMTP when STARTTLS is

      also successfully negotiated to provide a strong transport

      encryption layer.

   o  The new keyword "LMTPSA" indicates the use of LMTP when both

      STARTTLS and SMTP AUTH are successfully negotiated (the

      combination of LSMTPS and LSMTPA).

   o  The references for the ESMTP and SMTP entries in the registry

      should be updated to the latest specification [2] since both RFC

      821 and RFC 1869 [5] are obsoleted by RFC 2821.

2.  Implementation Experience

   The ESMTPA, ESMTPS and ESMTPSA keywords have been implemented in

   ...