At 2:00 PM +0300 2/4/03, Vitaly wrote:
i need to send confirmation to the sender that his (or her) mail has been loaded by the user during pop3 or imap session.Standard Internet email provides for delivery status notifications (DSNs) and message disposition notifications (MDNs).
Does qpopper provide that? Can i implement by own mail filter (program) that scans every recieving mail? is there another programm for this purpose?
DSNs are requested at the SMTP (transport) level, and can result in positive acknowledgment of a message's arrival at the last server (the user's spool). It must be supported by the originating submission program, and all servers in between. It does not indicate if the message was ever downloaded by the user, but it can give a reasonable indication that the message wasn't lost en route.
MDNs are requested in the message header, and are a request by the originator to the recipient to send an indication of how the message was acted on by the recipient or his or her agent (for example, read, deleted unseen, etc.). It must be supported by the originating submission program, and the recipient's user agent. The RFCs require that the end user must approve the sending of the notification, that it not be done automatically (for privacy purposes); how this is done is up to the user agent. Some, such as Eudora, put up a dialog with text such as "the sender of this message requests acknowledgement that you have seen it".
In the old days, there was a non-standard header that could be set to cause the final server to send various forms of automatic notification, but this caused serious operational problems and has largely been abandoned in favor of the standardized solutions.
--
Randall Gellens
Opinions are personal; facts are suspect; I speak for myself only
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