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* SMTP, the protocol at the root of these problems, originated at a time when the links between Internet sites were slow and intermittent*

I think the author missed the whole point. Not everyone has access to fast internet or internet at all. SMTP was designed with that in mind, and it also works better than other real time messenger in that sense. Async federated communication.

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I'm referring to a time when the Internet backbone was slow and intermittent. You're describing the last-mile situation.

JMAP offers a solution for intermittently connected devices (phones) which expect notifications and messages from Internet services.

I expect TMTP will do the same; it's far from final. (I'm the author.)

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