The current mail UI is using a lot of space, but not very efficient. As a lot of my mail contacts don’t use avatars, switching this feature off should also disable avatars with a character and a color.
Using a label uses 1 line, instead of adding it to the “from” line. Attachments also use one line. A mail with a sender, subject, (first line of mail), label and attachments takes 4 (or 5) lines!!
A compact view would be great