Thunderbird still is pretty fast, though not as fast as before. And until the user-hostile changes (mandatory setup wizards) began creeping in a few years back

Thunderbird still is pretty fast, though not as fast as before. And until the user-hostile changes (mandatory setup wizards) began creeping in a few years back, one of the venerable classics that you could still rely on. Pretty sure the new version is going to be a steaming pile of modern usability horrors; reduced features, cheeseburger menus, unreadable UI elements because it has to "look modern", all powered by Electron & co. Can't say I'm surprised though.