Actually Simplified Privacy offers a service to setup a self-host email on a 1 CPU 1 RAM VPS for you, (with open source email, chat, and cryptpad), and then hand over the credentials to you. We guarantee it won’t be spam, or your money back.

Cloud Combo Package: Email, Docs, & Chat | Simplified Privacy

Setting up all the DNS records right takes some effort, yes. You will need a VPS or an ISP that gives you a static IP and the ability to set the PTR record for it. Other than that, self hosting without losing email is perfectly possible. I have been doing it for the last 10 years or so.