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SMTP Service Extension for Remote Message Queue Starting (RFC1985)

IP.com Disclosure Number: IPCOM000004201D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 6 page(s) / 14K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. De Winter: AUTHOR

Abstract

This memo defines an extension to the SMTP service whereby an SMTP client and server may interact to give the server an opportunity to start the processing of its queues for messages to go to a given host. This extension is meant to be used in startup conditions as well as for mail nodes that have transient connections to their service providers.

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 20% of the total text.

Network Working Group J. De Winter

Request for Comments: 1985 Wildbear Consulting, Inc.

Category: Standards Track August 1996

SMTP Service Extension

for Remote Message Queue Starting

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.

Abstract

This memo defines an extension to the SMTP service whereby an SMTP

client and server may interact to give the server an opportunity to

start the processing of its queues for messages to go to a given

host. This extension is meant to be used in startup conditions as

well as for mail nodes that have transient connections to their

service providers.

1. Introduction

The TURN command was a valid attempt to address the problem of having

to start the processing for the mail queue on a remote machine.

However, the TURN command presents a large security loophole. As

there is no verification of the remote host name, the TURN command

could be used by a rogue system to download the mail for a site other

than itself.

Therefore, this memo introduces the ETRN command. This command uses

the mechanism defined in [4] to define extensions to the SMTP service

whereby a client ("sender-SMTP") may request that the server

("receiver-SMTP") start the processing of its mail queues for

messages that are waiting at the server for the client machine. If

any messages are at the server for the client, then the server should

create a new SMTP session and send the messages at that time.

2. Framework for the ETRN Extension

The following service extension is therefore defined:

(1) the name of the SMTP service extension is "Remote Queue

Processing Declaration";

(2) the EHLO keyword value associated with this extension is "ETRN",

with no associated parameters;

(3) one additional verb, ETRN, with a single parameter that

specifies the name of the client(s) to start processing for;

(4) no additional SMTP verbs are defined by this extension.

The remainder of this memo specifies how support for the extension

affects the behavior of an SMTP client and server.

3. The Remote Queue Processing Declaration service extension

To save money, many small companies want to only maintain transient

connections...