No possibility to check storage usage for a mail account.
A display of the used storage capacity either on the frontend or in the settings.
Opening a proposal recently, asking that question this feature shall solve, I was led to this feature requests section. Before I switched to mailspring (already quite a while ago) I used to work with thunderbird. It was showing the percentage of exhaustion of an account you are using in the bottom right corner and in the properties of an inbox. I’m not like hardcore missing this feature, but it’s definitely nice to have and a useful one.
A reply I got on this question suggested opening a feature request.
Original Post: How to display left storage space?
Hoping this serves a purpose i wish everyone all the best.