The Problem
When I take a quick glance at mailspring, its not easy to see which messages are unread. The little blue dot is just too small and insignificant.
Proposed Solution
Bold letter on the entire message preview would really benefit. I realize that its already bold in some themes, but not significant enough, it needs to be bolder, or add a darkened/lighter background than the rest of the messes.
There are many other ways to make it stand out, this is just one of them.
Context
Every other mail client uses bold letter and a background to contrast unread messages