when setting up the notification distributions, there's an option to use an "email address". I have been told that this email address will only work when it's already registered as a valid mingle/IFS user. That doesn't completely make sense to me, because if that was the case, then why both with an email addr, and just find the user through the type of "user"

anyway, wondering if anyone is using ION/WF to send emails to externals (like, customers/vendors) ?
Thanks
Tim