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On-Demand Mail Relay (ODMR) is a protocol designed to improve the process of delivering email over the internet, particularly for users with dynamic IP addresses or those connecting from networks that are typically blocked by other mail servers due to security policies. ODMR allows a mail server to hold (store) email messages for a client until the client explicitly requests the delivery of the messages. This request is often initiated when the client establishes a direct and presumably more secure connection to the ODMR-compliant server.
The primary scenario where ODMR is useful involves mobile or remote users who connect to the internet using different networks, possibly with dynamically assigned IP addresses that may be on blacklists or deemed less trustworthy by receiving mail servers due to their temporary nature. By using ODMR, these users can have their outgoing email messages temporarily stored on a relay server. When they are able to establish a secure and trusted connection to this relay server, they can then request that their stored emails be forwarded to the intended recipients. This circumvents potential issues of mail delivery failure due to IP blocking or reputation.
ODMR works under the assumption that the relay server has a stable IP address and a good reputation, thereby minimizing the risk of emails being rejected. The protocol utilized for ODMR is often SMTP (Simple Mail Transfer Protocol) with extensions or modifications designed to support the on-demand aspect of mail forwarding.
One of the protocols associated with ODMR is SMTP Service Extension for On-Demand Mail Relay (AT