When an email blast or direct message is sent from the NationBuilder control panel, the recipient will see both the From name (i.e. the Broadcaster name) and email address listed as the sender in the content of the message.
When a direct message is replied to from the control panel, the recipient will only see the email address listed as the sender in the email's content. The From name will still appear as the sender in the inbox view of the message, just not above the content when the message is opened.
It would be preferable for the From name to appear for the recipient in all circumstances.