[theshrike79]

Fastmail has Masked Email, it even integrates with 1Password so you can generate a new email as you're registering for a new site.

It's easy to unsubscribe from a shitty service or a newsletter, just delete the email and that's it.

They also have custom domain names, you do need to do the requisite DNS magic, but they give you step by step instructions where you just copy-paste stuff. And I think you can have them host the domain so they'll handle everything.

Fastmail labels ("tagging") works pretty well too, you just need to write the rules yourself, there is no fancy magic doing it automatically like Gmail.