Show HN: What is your go-to free email provider with custom domain support?
It used to be Google's workspaces, but they no longer have free accounts.
But it is stable, and I haven't had any issues with email delivery or problems managing the calendar.
I ended up paying for Google workspaces, because I wanted a unified view of all of my email and domains.
https://paulonteri.com/thoughts/how-to/custom-domain-with-gm...
If you're willing to pay, Fastmail offers a much better experience with custom domains.