[exim] mail routed wrong - need fix

Hi -

I'm running a cPanel server and the /etc/valiases/domain.com file was misconfigured for one client. He now has about 4000 messages in queue trying to be delivered to the wrong address.

Here's what I want to do:
Using this command or something similar
exim -Mar message_id email@???
how can I add a new recipient to the mail in the queue addressed to someone@??? ?

Obviously I want the new address only added to the messages addressed to someone@??? so that messages not belonging to his domain are left alone.

Any ideas of how I can quickly accomplish this? I was thinking a perl script - but I don't know how to write it. Once the new address is added - I'm hoping that when the queue is processed again the message will be delivered to the newly added good address.

Thanks Much,
Eric