I'm trying to find something and it's not easy. I'm using claws now and I doesn't seem to have dark mode.

Evolution should have it but my theme is set to 'Adwaita-dark' and evolution ignores it?

Thunderbird pissed me off by removing the tray icon...

I tried aerc but it didn't connect to my mail server for some reason.

Any other decent client that does support dark mode?