>It doesn't seem that LISTSERV has such a feature, short of creating
>a separate list for each topic area.  Is there a creative solution
>using current technology, or is LISTSERV planning to accommodate this
>in future releases?
 
It might be that the TOPICS= listserv definition will do what you want.
(as had been mentioned by other posters).  Others have actually used
separate lists and had a master list which controls who can subscribe to
the minor lists.  HEPROC-L@AUVM is an excellent example of the former,
whereas AFA-FIN@WSUVM1 of the latter.
 
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