🚀 go-pugleaf

| Well, the historical reason this wasn't necessary/desirable/done is
|called finger.

[...]

|  I regularly finger people, then look to see when my message was sent.
|Result? I know if it was read.

Actually, finger has the same problem as many existing read receipts,
and return receipts: incorrect user expectation.

Here Dave, a knowledgeable computer professional, arrives at a result
that is simply not true, because fingerd does not (and can not) know
if I have read my mail.

Sure Dave is almost certainly aware of this, but many more naive users
are not.  On _every_ system I've been on that had read receipts
(including counting finger as a read receipt), I have either gotten
told off by people who ``knew'' I had read my mail when in fact I had
not, or who were very confused that their MUA told them I never read
their mail when in fact I did.