Holy crap - this happened to me a couple days ago. I am glad it wasn't from something I did. I salvaged my contacts from the sent email that was SPAM in the first place, then I got a new email address from Google. I've had the same email address with yahoo for 6 years with no problem, now...I also have a MAC and have never had issues like this before.

I emailed yahoo on Saturday when I noticed the wacky email. I got a response today, saying that they got my email. That's it.

This is HUGE and I can't believe that yahoo has not sent anything out to all the yahoo email subscribers, either alerting or explaining the issue to them.