Email Notification Extensions
Bcc notification fields, you can select multi-reference columns that refer to the user property table. This allows for a couple of interesting scenarios, such as selecting multiple assignees in a task tracking system:
and setting up the notification to send emails to the assigned users:
Another extension is that comma-separated email address lists, as a result of Formula-Email calculations, are allowed in the notifications as well. If you are producing the list of emails via summary’s Concatenate function, simply wrap the result into the Formula-Email column to allow hyperlinking.
After that, you can use the Formula-Email column in the notifications.
All of the above obviously apply to the email alerts sent from the workflow rules.