In the latest edition of the Yahoo mail, the "reply all" button has been made conditional where it appears or disappears based on whether the email chain has one or more persons on it. When this happens, the location of the delete and spam buttons to move. Previously, I would keep my mouse on the delete button and keep clicking on it as I am going down my emails. Now, when the "reply all" button disappears, the spam button shifts to the location where the delete button used to be. And unintentionally, I end up marking the email as spam when I had only intended to delete it. My suggestion is to keep the "reply all" button static, just make it disabled if needed if there is only one person in the email chain. This shifting of the buttons has caused some grief and I would be very happy if this issue is fixed.