Oki FAX 5780 Options Manual page 34

Return Receipt
User Function 92
!
Some mail clients and Internet Fax products currently
on the market cannot receive this MDN format
correctly.
!
MDN vs. DSN
MDN = Message Disposition Notification
DSN = Delivery Status Notification
MDN: you receive a confirmation that your message
was received by the destination mail server.
DSN: you receive a confirmation that your message was
opened by the person you sent it to (the recipient).
All systems involved in the communication must support
MDN and DSN.
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34 OKIFAX 5780/5980
!
When User Function 92, Return Receipt is set to ON,
you will receive a notification when the recipient of
your message opens it.
The recipient MUST HAVE a mail program that uses
the Message Disposition Notification (MDN) standard.
Netscape Messenger, Eudora Pro, and the OKIFAX
5750/5950 and 5780/5980 Series Facsimile Machines
support MDN.
!
When User Function 98, Network Settings, Item 12,
Delivery Service Notification (DSN) is set to ON, you
will receive a notification when your message arrives at
the recipient's inbox on the mail server.
The recipient's server must support the Delivery Service
Notification (DSN) standard.
!
Your machine always returns an MDN to anyone
sending mail with an MDN request, regardless of the
setting for User Function 92: Return Receipt.