I just can’t find a decent email client that looks like it’s from the last 20 years. Geary and Evolution both appear to be pretty modern but something about using Gmail with a Yubikey just doesn’t work and neither of them will connect to my account. Both on Fedora and OpenSUSE. Thunderbird works but it’s so old fashioned and Betterbird doesn’t look much better. What’s everyone else using?
i fear your best bet really is just using thunderbird or a fork of it and messing with themes.
I did have the same reaction on my first instal of thunderbird but after customizing it a bit i’ve come to like it