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B. an smtp extension
On-Demand Mail Relay (ODMR) is a protocol designed for the efficient delivery of email traffic. It operates under the SMTP (Simple Mail Transfer Protocol) family, specifically aimed at situations where direct and always-on internet connections are not available or are too costly. This is particularly relevant for mobile users or those in remote locations.
In essence, ODMR allows a mail server to hold outgoing mail until a client request is made to send it. When the client is ready or able to handle email traffic (for example, when a mobile user has intermittent internet access or when it is financially or technically viable to establish a connection), it signals the server to relay the stored messages. The actual transmission of emails uses SMTP, but ODMR manages the timing and initiation of these transmissions on-demand rather than continuously.
ODMR can be part of strategies to optimize email delivery for users with limited connectivity, helping to ensure that messages are relayed effectively when conditions allow. This can reduce the need for constant internet connectivity, saving on costs and resources while still maintaining communication lines.