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?
Yes to Claws-Mail. Absolutely wonderful…can use ProtonMail Bridge to get your ProtonMail on Claws. I use Thunderbird and Tuta, Proton apps in other contexts, but if I had to use only one, it would be Claws. The user remains in control there, stripping away HTML garbage by default.