Entirely agree with John and Ned, and would go even further:
This project should absolutely not be taken on unless either
a) it's very narrowly scoped (much more narrow than the description
seemed to imply) OR
b) it's such a good proposal that we'd feel comfortable deprecating one
or more existing and widely-used standard email protocols
IMO the last thing we need is Yet Another Mail Access protocol that user
agents need to support, and we might well be better off deprecating one
of the ones we have.
I'm not a huge fan of IMAP and it's looking pretty baroque by now, and
POP is so dysfunctional and ill-suited to mobile devices that phasing it
out would make sense. And a completely new protocol might actually be
a good idea. But *-over-HTTPS is almost certainly going to be worse
than any of the above.
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