I noticed when I go to check my emails (Yahoo) in my browser sometimes one email just disappears after a fraction of a second of my entering the Inbox. Just enough time for me to see it and then it disappeared and the ones under it all moved up a line. This one was from Hargreaves and Lansdown (stock market broker) and could have been important. But it's not in the Spam Folder or any other Folder. Any ideas? It has happened at least twice now that I noticed.