

+1 for mailbox.org, been using them for nearly a year and am quite happy with their service. Do note that their web UI is mediocre so you’ll probably want to use a mail client.
And definitely use a custom domain, they’re super cheap and allow for so much more flexibility (such as dedicated emails for different services).
















If you want to avoid being marked as spam I’d just go with .com, it’s as mainstream as you’ll get and only $10/year or so from a good registrar.