For about the last ten days or so, about twice a day (sometimes only once), I receive an email in my main Outlook in-box that shows empty sender and subject lines. It does show size as being 3kb or thereabouts. Suspecting the worst (virus propagation attempt, or some other form of intrusion), I have been deleting them without opening them. I do not use the preview pane, btw, so I have no clue as to what's actually in them. I have full anti-virus, firewall, and other protective utilities in place, operating, and all up to date. Anyone have any idea what these are and/or suggestions about how to respond? Thanks for any input.