> >         Could someone tell me how to set up 'filter' on a list so that
> > Juno subscribers would be rejected when they request to subscribe?  Is
> > it possible to edit the reject message that they get so it tells them
> > why?
>
>    The form of the Filter= header keyword entry would be:
>
>       * Filter= Also,*@juno.*
>       (see Access Control Keywords, Page 96, ListOwners Manual)

With this you may catch other junos that you don't want to, such as
juno.org (if such exists), or juno.somewhere.edu.  I suggest using

       * Filter= Also,*@juno.com

You can add another one for juno.net or whatever, if you need to.