Not sure where to go with this question. My Yahoo Mail--I get multiple delivery failure notices for messages that I never sent. The notices say that I am the originator of the messages. The recipients are not in my address book. What is going on?

Try asking Yahoo or Security & virus. Sounds like it's Spaming somehow.

they're fake. they're trying to get you interested into opening it and seeing what was supposedly bounced back. They might have viruses, etc.

Either that, or they're using your e-mail address to forge fake messages to other people, and you're getting the error messages returned back to you instead of them.