When you send an email you could have a flag “Requires Action” or “FYI”.
When you look in your sent items there should be a column showing the status:
- Not received
- Received – read
- Received – unread
- Replied
- Forwarded
- Deleted
- Recalled
Note: This isn’t a normal Outlook feature, it requires Exchange Server.
![Figure: Mail item properties dialog](https://bettersoftwaresuggestions.com/wp-content/uploads/2015/12/receipt.gif)
Figure: Mail item properties dialog