|Yep. Your email address is being spoofed. What that means is that someone who has you in his/her address book has a virus infected computer. The virus goes through that address book, sending emails to people in the address book, and making them appear to actually be sent from another address in that address book. In this case, your email addy.|
The undeliverable emails are being sent from that same computer to addresses that no longer exist and being delivered to you because your email is in the header as the sender.
Nothing you can do about it short of closing that Yahoo account and creating another.
"So won’t you give this man his wings
What a shame
To have to beg you to see
We’re not all the same
What a shame" - Shinedown