At one point I was the admin/moderator for 13 lists at the same time. This was 1994-1996 approximately.
Lsoft was filling some large voids with LISTSERV and LSMTP. Then Mailman came around and really took over.
Did anyone else find it weird that so many mailing lists ended in -L? I understand why but normal people probably didn’t know -L stood for list and techy people would have known it was a list without -L