Additionally, I have another email address for quite some time now, which I really like, but unfortunately, it was listed in one database leak, and basically ruined now, since I'm getting a daily dose of spam.
I came across services like simplelogin.io and anonaddy.com. Do you use one of these, and is there any benefit comparing to using a custom domain with an email service provider? Is there any third option you might be using which is not mentioned?
As for providers, half of my domains are just pointed at a tiny VM and the other half are on fastmail for family members to use provided they continue to maintain their customers best interests.