Some viruses & worms are sent that way. They are fake "undeliverable mail"
notices. Just delete them and do a complete virus scan with up to date
definitions.
Someone else has you in their email address book and their machine is
infected with malware. That infection is using your address as the sender.
It's sending a message to an address that can't receive messages and the
router in that domain is bouncing back an error to the only address it has:
yours.
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