I was able to locate the .csv downloads from my lists, and I sent my newsletter out immediately via my regular e-mail app (Courier, aka Calypso).
I had replies from several subscribers who had never received a newsletter before, even though they'd been subscribed for months.
I also had replies from people who had unsuscribed, but whose addresses were nevertheless included in the download. I had numerous undeliverables to previously deleted addresses.
So I am left wondering if this program ever worked properly. The bounce mechanism never worked at all, and now it seems that other functions may have failed too.
I see that on your website you've made clear the potential for server incompatibilities.
As you did the installation for us I trusted it more than perhaps I should have.
Anyhow, I'm not writing in rancor, but to applaud and encourage your efforts to make that point clear.