- The first: “Request a Delivery Receipt” will tell you that the recipients email server has accepted the email, not that the email has been read.
- The second: “Request a Read Receipt” confirms that the recipient has read the email. However, the recipient has the option to not send the read receipt back to you.

I often hear from clients that they hear hours after they sent an email that the recipient calls and says “They did not receive the email”.
If you need confirmation an email you sent was received by the recipient promptly, there are two options in Outlook that can help.
They are both available on the options menu.