I got a few similar e-mails, too.
My guess is that somebody (who knows your e-mail address) is sending e-mails to non-existing recipients with your e-mail address given in the “From” field.
For example, it may be caused by a worm that spoofed your e-mail address from the victims address book and is trying to spread that way. In short, I don’t think you can do anything about it >:(