Tons of Emails

I've always considered myself very lucky, I've never been one to get spam on top of spam on top of spam.
In recent weeks though, I have been getting roughly 25 to 30 emails a day, the vast majority telling me that the email I tried to send to someone has not been delivered for various reasons. The thing is, I haven't sent any of these emails, they all appear to be sent from my email address but with random letters before the @.
I have queried this on a couple of message boards and been told it seems like my email address had been cloned (or stolen, I forget exactly what I was told) but the main upshot of it is there's is nothing I can do about it.

Bastards