E-mail to external users via Information Broadcasting

When I e-mail a web report via Information Broadcasting to users in our company, it works fine. They receive the e-mail in their Outlook inboxes without a problem.

However, when I try to e-mail the same web report to an external address (such as hotmail), nothing shows up. I do not get any error message when scheduling the broadcast, but nothing shows up in the user's inbox.

Is their some setting I ned to do?

Thanks,

Kamini