Sending and Checking Delivery Progress

To send the message to the selected mailing list(s), click the "Send & Close" button. After the "Delivery Options" window shows up, select a primary and (optionally) secondary outgoing mail server or use the defaults. Click "Send" to start delivery.

You can watch the progress on the "Status" > "Outgoing Mail" panel. If you are looking for errors, use the "Status" > "Event Log" panel instead. More information can be found here: Monitoring Program Activity