ON-DEMAND MAIL RELAY (ODMR) SMTP with Dynamic IP Addresses
RFC 2645
Document | Type |
RFC - Proposed Standard
(August 1999; Errata)
Was draft-gellens-on-demand (individual)
|
|
---|---|---|---|
Author | Randall Gellens | ||
Last updated | 2020-01-21 | ||
Stream | Legacy stream | ||
Formats | plain text html pdf htmlized (tools) htmlized with errata bibtex | ||
Stream | Legacy state | (None) | |
Consensus Boilerplate | Unknown | ||
RFC Editor Note | (None) | ||
IESG | IESG state | RFC 2645 (Proposed Standard) | |
Telechat date | |||
Responsible AD | (None) | ||
Send notices to | (None) |
Network Working Group R. Gellens Request for Comments: 2645 Qualcomm Category: Standards Track August 1999 ON-DEMAND MAIL RELAY (ODMR) SMTP with Dynamic IP Addresses 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 (1999). All Rights Reserved. Table of Contents 1. Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. Conventions Used in this Document . . . . . . . . . . . . . . 2 3. Comments . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4. Description . . . . . . . . . . . . . . . . . . . . . . . . . 2 5. States . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5.1. Initial State . . . . . . . . . . . . . . . . . . . . . . 4 5.1.1. EHLO . . . . . . . . . . . . . . . . . . . . . . . . 4 5.1.2. AUTH . . . . . . . . . . . . . . . . . . . . . . . . 4 5.1.3. QUIT . . . . . . . . . . . . . . . . . . . . . . . . 4 5.2. Authenticated State . . . . . . . . . . . . . . . . . . . 4 5.2.1. ATRN (Authenticated TURN) . . . . . . . . . . . . . 4 5.3. Reversed State . . . . . . . . . . . . . . . . . . . . . 5 5.4. Other Commands . . . . . . . . . . . . . . . . . . . . . 6 6. Example On-Demand Mail Relay Session: . . . . . . . . . . . . 6 7. Response Codes . . . . . . . . . . . . . . . . . . . . . . . 6 8. Security Considerations . . . . . . . . . . . . . . . . . . . 6 9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . 7 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 7 11. Author's Address . . . . . . . . . . . . . . . . . . . . . 8 12. Full Copyright Statement . . . . . . . . . . . . . . . . . . 9 1. Abstract With the spread of low-cost computer systems and Internet connectivity, the demand for local mail servers has been rising. Many people now want to operate a mail server on a system which has Gellens Standards Track [Page 1] RFC 2645 On-Demand Mail Relay August 1999 only an intermittent connection to a service provider. If the system has a static IP address, the ESMTP ETRN command [ETRN] can be used. However, systems with dynamic IP addresses (which are very common with low-cost connections) have no widely-deployed solution. This memo proposes a new service, On-Demand Mail Relay (ODMR), which is a profile of SMTP [SMTP, ESMTP], providing for a secure, extensible, easy to implement approach to the problem. 2. Conventions Used in this Document Because the client and server roles reverse during the session, to avoid confusion, the terms "customer" and "provider" will be used in place of "client" and "server", although of course this protocol may be useful in cases other than commercial service providers and customers. In examples, "P:" is used to indicate lines sent by the provider, and "C:" indicates those sent by the customer. Line breaks within a command are for editorial purposes only. The key words "MUST", "MUST NOT", "SHOULD", "SHOULD NOT", and "MAY" in this document are to be interpreted as defined in [KEYWORDS]. Examples use 'example.net' as the provider, and 'example.org' and ' example.com' as the customers. 3. Comments Private comments should be sent to the author. Public comments may be sent to the IETF Disconnected SMTP mailing list, <ietf-disconn-smtp@imc.org>. To subscribe, send a message to <ietf-disconn-smtp-request@imc.org> containing the word SUBSCRIBE as the body. 4. Description On-Demand Mail Relay is a restricted profile of SMTP [SMTP, ESMTP]. Port 366 is reserved for On-Demand Mail Relay. The initial client and server roles are short-lived, as the point is to allow the intermittently-connected host to request mail held for it by a service provider. The customer initiates a connection to the provider, authenticates, and requests its mail. The roles of client and server then reverse, and normal SMTP [SMTP, ESMTP] proceeds. Gellens Standards Track [Page 2] RFC 2645 On-Demand Mail Relay August 1999 The provider has an On-Demand Mail Relay process listening for connections on the ODMR port. This process does not need to be a full SMTP server. It does need to be an SMTP client with access toShow full document text