Mass Emails in BIGIN - BCC rather than TO?

Mass Emails in BIGIN - BCC rather than TO?

When I choose multiple contacts and try to send mass emails, each contact's email shows up in the "To" field. I do not want my contacts to see each other's emails. Is there any way to put these email addresses in a BCC field instead? Or not show the list to everyone?

This is for BIGIN.

Thanks,
Sunil