TL;DR: We think we have fixed the problems with bounces and email delivery being disabled. If you see a notice of your address being disabled due to bounces, please contact email@example.com and let us know. You may have missed some emails. We’re very sorry, but there is nothing we can do. The archives should be complete though.
Thanks for the detailed info! I was very much affected and will check
if the quality has increased.
About From/Reply-To issue, if that's the only thing that will change,
I see no problems with it, since this is a mailing list, people expect
it to be that way.