> To my knowledge, [Thunderbird] still sucks less than any other free and open option,
Have you tried Claws Mail? It's a plain native traditional email client, and I find it really snappy.
There is even a Windows port. Not sure how "native" people might consider that as it's still based on GTK for Windows, and I don't have personal experience with it, but might be worth giving a try?
Claws is really great, but it IME it lacked in getting the search results - I just never could find things as easily as in thunderbird; maybe I was not knowing how to "hold" it best yet, though.
That said, I need to scan through a lot of mails for some specific things, thunderbird is barely getting a long with that anymore (the day I have to setup notmuch for real seems to be around the corner), so for most people Claws search may be easily good enough.
Have you tried Claws Mail? It's a plain native traditional email client, and I find it really snappy.
There is even a Windows port. Not sure how "native" people might consider that as it's still based on GTK for Windows, and I don't have personal experience with it, but might be worth giving a try?
https://www.claws-mail.org/downloads.php