+1 for fastmail, been using them for a few years now and haven't any complaints. Have many domains with them, wildcard emails are easily configured so that every service that I subscribe to gets a unique email address.

One minor issue is their JMAP[1] protocol if you want to automate email sending - its intention are good just that no one else supports it.

[1] https://www.rfc-editor.org/rfc/rfc8621.html