Nice find for sure. I think the issue with outside server technology is adoption by both sender / receiver - the main hypothesis is based on sync time managemen

Nice find for sure. I think the issue with outside server technology is adoption by both sender / receiver - the main hypothesis is based on sync time management between both. Like regular verbal communication (instead of messaging) happens over same time. For us thats like water to fish. Implementing a time server function to email systems would create a sync'ed communication system.