Messages stuck in queue

Hey all,

I have about 6000 messages stuck in my SMG queue waiting to be delivered to a specific domain.  The domain stopped accepting mail from us.  We are routing mail via a different route but in the interim until we resolve our communication with this domain, I have mail destined for that domain sitting in my scanner queues.  What I was wondering if there is a way to expire the messages and kick back an NDR to the senders?  I didn't see an easy way to do that other than to either re-route the messages to a different route or delete the messages entirely.  Any ideas?

Thanks