Ask HN: Email hosting for low-usage multiple domains?

Does anyone else have a few domains for different projects that they send/recv e-mails from? I'm looking for the best way to do this in 2021.

  Fastmail ($50/year) unlimited domains aliased to 1 account looks like best in class based on comments in this thread-- https://news.ycombinator.com/item?id=22789401 .
  Migadu (now $90/year) was formerly the go-to based on its old prices. Then they auto-renewed my annual subscription without notification at about 2x the price. Looking to move away in case they do that again.  
  Mailbox.org (1€/month/e-mail) looks promising.  
  Zoho mail ($1/month/e-mail) also looks promising.

Another option is FOSS self-hosted, which actually looks more safe in 2021. The major problem is finding an IP that's not blacklisted.

  Mailcow: https://mailcow.github.io/mailcow-dockerized-docs/ . Completely dockerized. 6gb ram required (VPS in the ~$40/month range)  
  Mailinabox: 1gb ram required (VPS ~$10/month). Same problem with having to deal with blacklisting, much less ram required though. Can also use dockerized version.