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Re: [ietf-smtp] DSNs

2020-04-26 05:32:02
On Saturday 25 April 2020 23:15:23 CEST, Ned Freed wrote:
Completely inapplicable in this case, I'm afraid. One of the primary goals of
the NOTARY effort, if not the primary goal, was feature parity with X.400.
And the operational model for X.400 was success receipts as the default.

So the feature had to be part of the core.
But thinkgs change. X.400 collapsed - a casualty of even more serious
design errors than success DSNs. Spam became email's biggest problem,
which made NOTIFY=SUCCESS less desirable. Privacy concerns also arose that
weren't even on the radar at the time this work was done.

X.400 collapsed, other things appeared. Delivery and display receipts appear to be popular features of some human-to-human instant messaging systems nowadays — I've heard that Signal added that precisely because it was popular with Telegram users. That's a rumour, but that both have delivery receipts is a fact.

I've no idea what the problems with notify=success are considered to be, so I don't know whether Signal/Telegram/Threema/… have equivalent problems, or whehter the problems relate to some aspect of the implementation that is not shared by those IM implementations. I'd love to know.


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