I wonder what you don't like about
"groups.io" Its pretty much a pure mailing list?
Like all of the webby time-wasters, they don't have easy to mirror zipped archives,
because
they want to to spend time hovering around clicking on their sites.
http://www.classiccmp.org/pipermail/cctalk/
The one thing I would change here is removal of the restriction on attachments.
Well, two things.. Getting rid of the cctalk/cctech split as well.