> In Entourage at least one address must be in the "To" box for the
> email to be sent (Unless there is some way of doing this that I have
> not yet discovered).

In my Entourage, in the little panel for entering address I can click in
the region to the right of the "BCC" label, and start entering addresses
there. No need to have anything in the "To" section at all.

Or you can drag addresses around between sections.

Hope that helps.

Ryan