Ask HN: What is the ideal email domain setup?

For a long term setup what do you use? I am debating a few setups in fastmail.

Generic custom domain with 1Password uniques for all online signups Also have a standard name@ here for in person provider sign ups

A family domain purely given to friends and family to share correspondence.

Is the second domain worth it? Inevitably someone will share it and end its “anonymity”?

Is it worth running a Gmail for any reason and forwarding that in?