RFC 2645 (rfc2645) - Page 2 of 9

ON-DEMAND MAIL RELAY (ODMR) SMTP with Dynamic IP Addresses

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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

   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.


   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

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