Do you have a recommendation on the least horrible big email company to use for a personal domain? I'm using Proton, but I'm mildly annoyed that they don't provide native IMAP - you have to install their Proton Mail Bridge app.
email protocol is atrocious. This leads to few options for clients and nearly no library to work with. I'd like to setup a box with a limit for unread mails and a API to publicly show the current number of unread mail. That would enable me to put a box out there for anyone to contact me and have a feedback about the likelihood of an answer. This is nearly impossible right now.
email protocol was created before spamming became a thing. There is no mechanism to deal with that. Everything is ad-hoc/workaround. Any modern messaging systens have either a way to ask permission to send messages first or some report/block system. We could also have a trust system to score nodes of the network.
In my eyes the features that make email successful are the decentralization, that it is not a product of a company, the wide client support and that can be used offline.