If you want to be certain that a message was delivered or read, you can have Outlook request a Delivery or Read Receipt from the recipient to ensure your message got through.
To track an individual message:
- Go to the Options tab of the message window when you are composing an email.
- Select the desired Tracking option.
To track every message:
- Go to the File tab, click Options, then select Mail on the left.
- Scroll down to Tracking.
- In the Tracking section choose your settings and click OK.