Why have the standards makers chosen to specify that requests for Delivery Status Notifications are to be sent via SMTP, and not via a header in the mail heading?


  1. This makes it easier to separate requests for different recipients.
  2. Easier to ensure that the notification can be correlated with the original recipient
  3. Delivery Notification is handled in the MTA layer, not the UA layer, and requests should then also be handled in the MTA layer>
  4. Earlier bad experience with non-standard functions in the RFC822-header

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