Neda's Efficient Mail Submission and Delivery (EMSD) Protocol Specification Version 1.3
RFC 2524
Document | Type |
RFC - Informational
(February 1999; No errata)
Was draft-rfced-info-banan (individual)
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Author | Mohsen Banan | ||
Last updated | 2013-03-02 | ||
Stream | Legacy | ||
Formats | plain text html pdf htmlized bibtex | ||
Stream | Legacy state | (None) | |
Consensus Boilerplate | Unknown | ||
RFC Editor Note | (None) | ||
IESG | IESG state | RFC 2524 (Informational) | |
Telechat date | |||
Responsible AD | (None) | ||
Send notices to | (None) |
Network Working Group M. Banan Request for Comments: 2524 Neda Communications, Inc. Category: Informational February 1999 Neda's 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. IESG Note 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. Banan Informational [Page 1] RFC 2524 EMSD February 1999 - 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-track protocol for efficient transmission of electronic mail messages, which will be highly compatible with existing Internet mail protocols, and which wil be suitable for operation over the global Internet, including both wireless and wired links. ABSTRACT 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 specification narrowly focuses on submission and delivery of short mail messages with a clear emphasis on efficiency. EMSD is designed specifically with wireless network (e.g., CDPD, Wireless-IP, Mobile-IP) usage in mind. EMSD is designed to be a natural enhancement to the mainstream of Internet mail protocols when efficiency in mail submission and mail delivery are important. As such, EMSD is anticipated to become an initial basis for convergence of Internet Mail and IP-based Two-Way Paging. The reliability requirement for message submission and message delivery in EMSD are the same as existing email protocols. EMSD protocol accomplishes reliable connectionless mail submission and delivery services on top of Efficient Short Remote Operations (ESRO) protocols as specified in RFC-2188 [1]. Banan Informational [Page 2] RFC 2524 EMSD February 1999 Most existing Internet mail protocols are not efficient. Most existing Internet mail protocols are designed with simplicity and continuity with SMTP traditions as two primary requirements. EMSD is designed with efficiency as a primary requirement. The early use of EMSD in the wireless environment is manifested as IP-based Two-Way Paging services. The efficiency of this protocol also presents significant benefits for large centrally operated Internet mail service providers. Table of Contents 1 PRELIMINARIES 4Show full document text