But: we are trying to configure Outlook so that we can send emails to a
"distribution list" in Outlook, but in such a way as to "hide" all the names
and email addresses from all recipients.

I have been unable to set this up using settings.  The only thing others
have suggested is to send the email To: the postmaster@theemailhostsite, and
to blind copy using the distribution list name.

Is there a maximun number of BCCs that can be successfully sent through SPAM
filters?

Or if you know of another solution altogether, let me know