Thanks for you words as it makes me feel like my client's list isn't being picked on.
Josh has been great in responding to this and trying to figure out what is going on. I have turned off the auto-pruning function on my client's list to see if that has something to do with it. We'll see. I am also being a bit more consistent about making backups of the lists as I can rebuild to a certain extent if I have to.
I wonder if something in the auto-prune isn't quite "smart" enough to know when a person may have bouncing emails for a couple of weeks because of being on vacation or something, then they bounce again for a couple of weeks a few months later, so that it seems like they maybe a bad address over an accumulation of time; instead, of just deleting those that repeatedly bounce every mailing. Not sure that makes sense. But was just an idea that popped into my head.
I have every confidence that Josh will come through for us (sorry, Josh, don't mean to put any pressure on you )!