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Message Disposition Notification (MDN)
This field requests the status of the email message after delivery through the Simple Mail Transfer Protocol (SMTP) transport system. After the recipient has received the message, this data is used when the machine or user reads the received email. For example, if the message is opened and read, the receiver sends back a notification to the original sending machine or user.
The recipient must activate the MDN field to be able to send a notification report; otherwise the request will be ignored.