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On-Demand Mail Relay (ODMR) is an email delivery system protocol designed to facilitate the sending of email from a temporarily connected device, typically through a dial-up connection or other intermittent network connections, without requiring it to be continuously online. The concept behind ODMR was to allow devices or servers with non-permanent internet connections to queue outgoing mail and then, when a connection is available, relay this mail to an SMTP (Simple Mail Transfer Protocol) server that would then handle the delivery to the final destination.
ODMR operates by holding outgoing emails on the client-side until it can establish a connection to an SMTP server that supports ODMR. Once the connection is established, the emails are sent to the server, which queues them for delivery. This process was particularly useful before the advent of ubiquitous, always-on internet connections, serving users in remote areas with intermittent internet access or those relying on dial-up connections.
The SMTP server configured to handle ODMR requests listens for a signal from the client. Upon receiving a signal (which indicates that the client wishes to send mail), the server switches to a receiving mode and accepts the emails from the client for further relay.
One of the protocols designed to support this kind of functionality was SMTP Service Extension for On-Demand Mail Relay (SMTP-ODMR), outlined in RFC 2645. However, with the global shift towards constant internet connectivity, the practical need for ODMR has significantly diminished, and it is now largely of historical interest. Today