Hello! My problem is that I’m all of a sudden getting lots of email bounces for email messages that I never sent. The bounces show that someone claiming to be me, or at least firstname.lastname@example.org, is sending spam about replica watches or some crap like that, to various random people, including Yahoogroups. I go offline for one day and this is what happens as soon as my back is turned! What or who is causing this and how can I make it stop? Thank you very much in advance for any assistance, as I am baffled and appalled.