Thanks! I tried Thunderbird a couple of months ago and abandoned it because its UX seemed to not have really progressed in a number of years -- I hadn't used it since the Netscape Communicator days but it seemed... somewhat the same.

Although I realize these days a number of modern clients store copies of your email on their own servers for push notifications (or more nefarious) purposes, so maybe Thunderbird really still is the best option out there. Regardless, thanks for taking the time!