Somehow (I wish I remembered how so I can report it) I ended on the
page
https://lists.racket-lang.org/listinfo/
It lists three Racket mailing lists, and all the links are dead, in the
sense tha following them leads to a report "Bug in Mailman
version 2.1.15"
Perhaps that page should be changed to point to the current mailing
lists. Or the bug should be fixed. Or that page removed entirely.
-- hendrik