Use a cheap dedicated server. A Raspberry Pi 3 can do it. You can use a cheap VPS to tunnel a "proper" IP address to your home network.

Or rent a cheap dedicated server like Kimsufi or online.net for a couple of bucks per month.

> Before we dive in, an important caveat: You will become a sysadmin of your own mail server.

I don't want to become a sysadmin of my own mail server, however I'd appreciate not having my personal data harvested by webmail providers (e.g. gmail, outlook.com). Using a Pi or dedicated server would make me a sysadmin.

Using AWS email seems like a decent middle ground which isn't too expensive ($0.10 per 1000 sent and $0.10 per 1000 emails received).

Then why not pay for Fastmail for example?