Thanks for your response Pete. At this point I am experimenting with the auto-delete tool on one list and I will see what happens. I standardize all of my list headers to keep things simple. I am afraid that with the nature of the nodes that I deal with that alot of the subscribers will be deleted by Monday or Tuesday. If too many users are removed then what good is the list? I am actively pursuing the postmasters at these nodes to see if I can get things flowing better, but I'm not sure it will happen. One bounce can generate 50 retries during the course of 3 or 4 days. It seems that over the weekend alot of the nodes are shut down for some reason and the system keeps trying to send. The manual recommends less than 7 for the Delay so do you think I should try 5 or 6 instead of 4?