yeah, I use Thunderbird, but it bothers me how slow it feels and the frequent little UI bugs with unread flags not updating and the delay of messages to show up in the unified inbox.
It’s nice that Betterbird has a system tray (I can’t believe how a standalone desktop app for emails neglects this, like TB does), but it still inherits a lot of the problems TB has.
v137 on KDE, there’s no minimize or close to tray option in the settings, like some screenshots suggest.
Thunderbird extensions for that don’t work on recent versions, and KDocker - which I used for a couple of years - doesn’t seem to work on Wayland. So the only option on some DEs seems to migrate to Betterbird.