We have NDRs disabled on our Exchange 2007 server to prevent backscatter. Is there any way to enable NDRs only when messages exceed size limits? It can be frustrating for people when their messages don't go through because they are too big but they don't get notified.
By the way, we are also using a barracuda e-mail filter in front of our exchange 2007 server. I don't have a size limit set on the barracuda though, so they will still pass the messages to exchange.