Currently thinking about either Tuta or Mailbox.org, but to be honest, I don’t even know many providers.
Something I do not like is limit on number of addresses with a custom domain. Mailbox is at least a bit reasonable with 50 on Standard, but Proton’s 10 on Mail Plus is disqualifying for me.
Tuta has unlimited number, but doesn’t support PGP.
So I plan to check out whatever you guys use.
Also happy with them. Might not be relevant but you can have all 50 aliases be different domains and wildcards count as 1.
Switched from protonmail because i wanted a second domain which was lots more expensive with them. I also didn’t like having to use their app. With mailbox i gave them my public key and they still encrypt everything on receipt but i just use Thunderbird as the client.