Today, mobile phones are super powerful, always-on and almost always connected. We should be able to run mail completely on the mobile device? There could be blind relay mailboxes in between to help store/forward the mails until they are retrieved by mobile phone app.. and of course there's end to end encryption with no metadata leakage in the relay.
This is how email was intended to work, but anti spam measures now prevent "any normal user's device" from originating a message. To deliver a message you would need to find a trusted relay to add legitimacy flags to the message, or you need a trusting recipient with a friendly network path between you so a plain message would not be blocked.
I know how email works. Have run very large deployments. I'm asking if such a 1-person completely decentralized convenient deployment solution exists? If not, why not?
Possible? Already exists - app? relay?