@atpfm @siracusa have you tried Mimestream? It feels like it's doing what you might want in a mail Mac app. It's Gmail native and Mac native, made by people who used to work on mail.app. Its source of truth is the Gmail server. I wanna say it's using the Gmail api and not one of the mail protocols, so it's the exact same rules, folders, filtering, … as the server. And with it being a Gmail client in the same way the Gmail web app is, it's much more a drop in replacement than other mail apps.