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Neda's Efficient Mail Submission and Delivery (EMSD) Protocol Specification Version 1.3 (RFC2524) Disclosure Number: IPCOM000003109D
Original Publication Date: 1999-Feb-01
Included in the Prior Art Database: 2000-Sep-13

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Banan: AUTHOR


This document specifies the protocol and format encodings for Efficient Mail Submission and Delivery (EMSD). EMSD is a messaging protocol that is highly optimized for submission and delivery of short Internet mail messages. EMSD is designed to be a companion to existing Internet mail protocols.

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 2% of the total text.

Network Working Group M. Banan

Request for Comments: 2524 Neda Communications, Inc.

Category: Informational February 1999


Efficient Mail Submission and Delivery (EMSD)

Protocol Specification Version 1.3

Status of this Memo

This memo provides information for the Internet community. It does

not specify an Internet standard of any kind. Distribution of this

memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (1999). All Rights Reserved.


The protocol specified in this document may be satisfactory for

limited use in private wireless IP networks. However, it is

unsuitable for general-purpose message transfer or for transfer of

messages over the public Internet, because of limitations that

include the following:

- Lack of congestion control

EMSD is layered on ESRO [RFC 2188], which does not provide

congestion control. This makes EMSD completely unsuitable for

end-to-end use across the public Internet. EMSD should be

considered for use in a wireless network only if all EMSD email

exchanged between the wireless network and the public Internet

will transit an EMSD<->SMTP gateway between the two regions.

- Inadequate security

The document specifies only clear-text passwords for

authentication. EMSD should be used across a wireless network

only if sufficiently strong encryption is in use to protect the

clear-text password.

- Lack of character set internationalization

EMSD has no provision for representation of characters outside of

the ASCII repertoire or for language tags.

- Poorly defined gatewaying to and from Internet Mail

Because Internet Mail and EMSD have somewhat different and

conflicting service models and different data models, mapping

between them may provide good service only in limited cases, and

this may cause operational problems.

The IESG therefore recommends that EMSD deployment be limited to

narrow circumstances, i.e., only to communicate with devices that

have inherent limitations on the length and format of a message (no

more than a few hundred bytes of ASCII text), using either:

a. wireless links with adequate link-layer encryption and gatewayed

to the public Internet, or

b. a private IP network that is either very over-provisioned or has

some means of congestion control.

In the near future, the IESG may charter a working group to define an

Internet standards...