To view your previous bulk messages go to the CONTACTS>SEND BULK MESSAGE page.
​
At the top of the page, you will see the View Message History button. Click on that to access information on when your message was sent and to whom.

*The View/Pending Messages button will only display IF you have any pending messages

Once you click on "View Message History", you will see all of your Bulk Messages that have been previously sent out. 

You can then click on the blue contact icon to view all recipients of the message. This will display the status of the message (Sent, Pending, Failed) and the exact date/time the message was sent.