> * Auto-Delete= Yes,Full-Auto,Delay(18),Max(2),Probe(27) > > My understanding is that this should result in any bouncing > address being cleared down within a month. However, those > annoying forwarded bounces have been appearing for more than > three months. Again, does this suggest that I've set some > parameter wrongly? You probably should reduce the value in Probe. What it means is that about 1/27 of the subscribers are probed each day that a message is posted. Since you post only once a week, it will take 27 weeks, not days, to probe everyone. The tradeoff is that more resources are required to send messages used as probes, as a separate copy is required for each address being probed. > I also have > > * Renewal= 3-monthly,Delay(7),Probe I would eliminate this. There's no reason to do both active and passive probes.