After 10 years of hosting my own email-server, I stopped last year. Getting DKIM, DMARC, and SPF right were a nuisance, but worked in the end. My biggest problem was that my mailserver had been blacklisted multiple times due to IP's in the same subnet misbehaving.

In 2022 I am going to host it somewhere more reliant, but for now i use the mailserver of my ISP.

Bit offtopic: I used AnonAdddy (https://github.com/anonaddy/docker) for my email-aliases.