I have several email accounts and so several evolution mail account folders in the left panel. As they have many subfolders, I collapse the folder tree of the not often used mail folders.
When a new email is downloaded/synced to an evolution folder that is collapsed, there is no sign to find out which one mail folder received new email. The title of the subfolders (like Inbox) would turn bold, so you know that there is a unread or new mail, but not with the account folder.

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