First I'd like to thank those who replied. Somebody asked if I'd like to share the messages. Yes I do. Following are those answers.
Some lists are available from more than one site.
I have usually only specified one site. Internet style addresses have been given where I have one, with bitnet style addresses used only when an internet address is not known to me. Details of how to join lists are given at the end of this article. A number of these lists are linked to newsgroups in the comp.soft-sys. This list reflects my own interests.