Tags would be useful, but the UI aesthetics could be better too: now it's too plain and minimalistic. Look at Yandex Mail for example: it's just less boring. I

Tags would be useful, but the UI aesthetics could be better too: now it's too plain and minimalistic. Look at Yandex Mail for example: it's just less boring. I guess you could attract much greater audience by adding theme support and proper marketing in light of this outrage. That said, I like fastmail very much: keyboard navigation, search and overall speed are great!