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return receipt
In email, the term return receipt is somewhat misleading. When delivering a message to a recipient's computer system there is no way to force that computer system to issue an acknowledgment to the sender.
This is in contrast with a physical delivery medium in which a courier acting on behalf of the sender can honor the ''sender's'' requirements for delivery - including hand-delivery of the message to the recipient and even requiring that recipient to authenticate himself to the courier before receiving the message. This difference in capability between physical delivery systems and electronic mail causes confusion and misunderstanding. For this reason, many experts eschew the term return receipt in connection with email, in favor of less misleading terms.
However, two notification services similar to those available for physical delivery are available for e-mail. One is called Delivery Status Notifications or DSNs, and the other is termed Message Disposition Notifications or MDNs.
==Delivery status notifications==
(詳細はMessage Transfer Agents (MTAs) using the Simple Mail Transfer Protocol (SMTP), and a message format to be used to return indications of message delivery to the sender of that message. Specifically, the DSN SMTP service is used to request that indications of successful delivery or delivery failure (in the DSN format) be returned. Issuance of a DSN upon delivery failure is the default behavior, whereas issuance of a DSN upon successful delivery requires a specific request from the sender. Note that for various reasons, it is possible for a message to be delivered, and a DSN being returned to the sender indicating successful delivery, but the message subsequently fail to be seen by the recipient or even made available to them. The DSN SMTP extension, message format, and associated delivery status codes are specified in RFCs (3461 ) - (3464 ) + (6522 ).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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