In the top nav bar, click on the "Inbox" dropdown. It will expand.
Click on the ( Menu) icon on the top right corner of the page. The menu will expand.
Then click on the dropdown that says "Inbox". It will expand.
Then click on Outbox in the list of links.
A list of your sent messages will appear.
To view a message, click on the subject of the message.
The Messages that have been opened by the recipients, will have a checkmark to the left of them. the word opened next to them.