As one organization that uses confidential lists, it was my understanding
that "confidential=yes" meant that listserv never mentioned the list in
queries to it. Needless to say, there are other ways that people can find
out about such lists, such as inclusion in headers, redirected mail, and
probably some more "agressive" ways...
>
> I have received complaints from listowners (as well as experiencing this
> myself)  that users are attempting to subscribe to lists which are set
> to confidential=yes.  Because of the nature of the lists, these are not
> lists about which anyone would know.  Does confidential=yes mask
> everyone?  It is politically important that NOONE even know about the
> lists.