At this point the GLX doesn't handle this, mostly because you want a
different behaviour for xxx-request@CMUVM and for [log in to unmask]
If the mail is explicitly directed to your host but the list does not
exist, it could be because of a spelling problem or because it was
deleted and the postmaster should probably get a copy. If it was sent to
the generic LISTSERV node it should be forwarded.
Eric