My work-around: 1. Create a filter on "To", with correct dotting, with the action being to apply a new tersely-named label e.g. "dot". 2. Color all instances

My work-around: 1. Create a filter on "To", with correct dotting, with the action being to apply a new tersely-named label e.g. "dot". 2. Color all instances of the new label a greenish shade to signify goodness. Do this by going back to Inbox, hovering over the name of your new label, clicking on the downward triangle, and following the menus from there. Anything incoming lacking the green label is a suspect.