Message Progress Bar
After you click Send on a message, you'll see a progress bar displayed at the bottom of the screen. Do not exit the screen until the progress bar completes.
You can cancel your message at any time while the progress bar is loading to prevent your message from sending.
Once the progress bar is complete, you can check the status of your message in the Outbox area of your Messaging module. You can click on the message in your Outbox to see the delivery status per-recipient (Sending, Sent, or Omitted).
All recipients who you see with a Sending status will eventually move into either the Sent or the Omitted status.
Successfully delivered messages will now appear in your Inbox. Omitted messages will display a reason for the omission.