Also: Some folks have been asking, "Where can we continue our lists?" I'm astonished to see that Squidge.org is still around. It has been hosting fandom since 1994; a lot of fandom lists moved over there from Yahoo Groups because Squidge.org had more fan-friendly policies. You can read about its history here:

https://www.squidge.org/Squidge.org/About_Squidge.org.html

You can see its lists here:

https://lists.squidge.org/wws
https://lists.squidge.org/wws/lists
https://fanlore.org/wiki/List_of_Squidge.org_Mailing_Lists

And they're at Dreamwidth:

https://squidgestatus.dreamwidth.org

I haven't used Squidge.org recently, but I did have a list there briefly in the 00s, and it worked fine then.