First of all, congrats to the mailspring team! mailspring is currently my favourite Linux email client after migrating from OS X 
The Problem
The unified inbox view could be “smarter”. I’m migrating away from “Spark” because there is no Linux version and i believe they have a cool approach to this. They separate the unified inbox list into categories such as “Newsletters”, “Pinned”, “New” and “Seen”, etc. I think newsletters isn’t particularly important but the others are quite useful.
At the moment we have “starred” emails that we can access by clicking on the panel in the side. However, we need to remember they are there and even though it works, it isn’t displayed in a “unified” way and doesn’t keep our important emails visible at all times.
Proposed Solution
It would be cool if we could separate the second column (the email list) to have “New Emails” at the top in its own section, “Pinned Emails” below that ( this would basically be the starred messages ), and then “Seen Emails” under that, using the normal sorting order.
The “Spark” email client does this feature quite well and i have found it intuitive to have my “important” stuff organised and visible at the same time as my normal email list in an easy to understand and unified view.
Context
Here is an example of how Spark’s smart inbox is organised ( as i said, i don’t think newsletters particularly warrants its own group, but here it is as an example ):
Having smart inboxes as an optional feature would be a great addition - at least in my humble opinion
Thanks for your consideration!
