I've just updated to Sierra & have a problem with Mail. Previously there was an 'Thumbs Down' 'Mark as Junk' button on the toolbar to mark as junk & if you highlight a mail marked as Junk then there was a 'Thumbs Up' 'Mark as Not Junk' button. The Thumbs Up button now no longer appears but there is a 'Not Junk' button in the viewing pane. Is there some way of getting back the 'Thumbs Up' button as this was useful to select & mark multiple messages as 'Not Junk'. There is no option in Customise Toolbar'.