All,
The web interface for the new mailman version is at https://mailman3.common-lisp.net/postorius/ for mailing list administration and https://mailman3.common-lisp.net/hyperkitty/ for the archives.
Let me know if you find irregularities or have other remarks.
I checked the recently moved cmucl-cvs archive.
It looks as I would expect. The only thing that I wish it did is show the HTML version of the mail instead of the plain text since I’m using a browser to view the archive. I can scroll down to the bottom of the message and view the attachment that contains the HTML version, so at least it’s there. When I read the messages (sent to the list and not the archive) with gmail (or Thunderbird or GNUS), I see the html version of the message.
Not a big problem if this is not easy to do. The info is there if I really want to see the html version.