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On-Demand Mail Relay (ODMR) is a protocol designed for the efficient delivery of email messages. It is primarily used by mail servers that have intermittent or unreliable connections to the Internet. The main idea behind ODMR is that it allows these servers to queue outgoing messages and deliver them when a stable connection becomes available. ODMR is notably useful for servers operating in remote locations or with limited connectivity, ensuring that messages are sent and received without needing a constant, direct connection to the wider internet.
In a typical ODMR setup, the server holding outgoing mail will notify a more consistently connected server (often referred to as an ODMR server or SMTP server configured to handle ODMR requests) that it has messages ready to be sent. This notification can happen whenever the server with queued mail establishes an Internet connection. Upon receiving this notification, the ODMR server then requests the queued messages, effectively pulling the queued email from the sending server. This process allows the server with intermittent connectivity to offload the messages, which the ODMR server then relays to their final destinations.
ODMR is part of the suite of protocols and methods devised to optimize email delivery in various operational environments, helping to ensure reliability and efficiency in message transmission despite connectivity challenges.