I'm stumped trying to figure out why my mom (and a number of other people on my contact list) have received a spam email coming from me. It goes along the lines of: "Hello! <insert link to some Viagra page at some Canadian pharmacy website here>". I'm using Yahoo mail. I have a friend who says he's been getting spam emails from one of his friends, who also uses Yahoo mail. I'm wondering if something's going on with Yahoo mail, or is this just some coincidence, and if it is just a coincidence, then who hacked my email, and how did they even do it? I certainly never told anyone my password for anything, let alone my email address. I don't have a keylogger or any other virus either, I just ran a full malwarebytes scan and it came back clean.