(1) When composing a mail ,open the Options drop down menu on the toolbar, and then select [Delivery Status].
If you enable the Display Frequently Used Options in your preference settings, you can select the Delivery Status directly on the Compose page.
(2) After sending the email, you can check the email delivery status in the sent box page. In the sent box page, click the button and you can see the delivery status of the mail.
3. Retrieving and Sending Mails-Advanced