I use migadu.com now, previously also used mailbox.org and protonmail.
The great part with migadu is how much control you have. Want to add multiple domains or have multiple users? No problem. (Though they reserve the right to ask what you’re doing if it’s excessive).
Limits are based on mails sent, mails received and storage space.
I was on their cheapest plan (19$/year) until I filled my receiving contingent because my servers had issues and monitoring kept dutifully sending email alerts about that.

Perfect opportunity to link this banger https://youtu.be/EDnIEWyVIlE

This is a common meme that you either end up as trans or a right winger when you use Linux for a long time.

Not sure about the history, but !unixsocks@lemmy.blahaj.zone is one classic example and enough public figures like Luke or Brian Lunduke incorporate the other side.