Enable Read and Delivery Receipt Confirmation on Outlook 2010
When sending an e-mail, you can request a return receipt. This is a message that will let you know that your e-mail was delivered. You can either set this option on individual e-mail messages, or as a global option to apply to all e-mail sent.
1. Click File > Options > Mail.
2. Under Tracking Options, check the box before: Delivery receipt confirming the message was delivered to the recipient’s e-mail server