I have been a self-hoster for over a decade with various services like email, Nextcloud and Jellyfin. Many people I meet are interested in a home email server setup but get hung up on the details around domain registration, port forwarding and the hoops you have to jump through with ISPs to receive and send email.
I am imagining a hockey puck sized computer which is your email storage. Your email would stay in your control, never on a cloud system to be harvested. The service aspect would be providing a preconfigured VPN, DNS and email relay.
Would anyone be interested in a truly “plug-n-play” device and service that handles all these details?
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I would be more interested in an smtp relay service like ghettosmtp which could tunnel through CGNAT.