Filtering NDRs

We are a Exchange2000 shop and this is what I want to do. I want to be able to filter out what NDRs get delivered to our exchange admin box. This is why… We’ve just switched our naming convention from jd@domain.com to jdoe@domain.com at the begining of the year and now we just removed the jd@domain.com from the users e-mail address BUT we still have a people trying to send to jd@spvg.com and when they do we like to recieve it in the admin box so we can forward it on and let them know they need to update their contact info. BUT we also have people that have been gone for years that are still reciveing mounds of junk mail that’s going to the admin’s box. What I want to do is stop the old employes from coming in the the admin box at all but allow others to come in. Is there a way I could do this?