The impression I have is that you wish to treat a mailing list as a newsgroup. Is this correct? I just wish to clarify as these are two very different animals.
A mailing list consists of a list of email addresses to which all contributions are sent. That's it. There may be an archive for the contents of the list. There is no "server" per se. What is it about the mailing list that you do not like or wish it would do differently? In gnus, you can split any emails that go to a specific list to a different group and therefore treat it like a newsgroup in that all the articles will be in the same place. HTH, eric -- Eric S Fraga with org 9.5.2 in Emacs 29.0.50 on Debian 11.3