Not sure where to address this issue, though, this Apple Mail (bug?) is incredibly annoying.
Searching for something brings the same email 100 times, +thousands of bin entries. Why this behavior? How to fix that? It simply makes impossible finding any emails.
After the last update, it became even more annoying. Now it shows "Deleted Messages" as well.
Those aren't even actually deleted messages. They are trash of autosave process.