Life must be filled up

I don't usually get much spam, just the occasional offer of Viagra and so on. Today I'm getting hundreds of messages, all delivery failure spoofs. It's getting worse this afternoon so that every time I check mail there's another hundred, with perhaps a genuine message lurking, which I could easily miss. I feel victimised. Any suggestions?
update 10th. 840 messages this morning. Bastards!
Later update over 2,000 messages today so far. This must be mischief making designed to screw people up?