You may follow the below steps for Enable read receipts :
1. Log into to your SmarterMail webmail interface.
2. Once in the SmarterMail interface, click the "Settings" link on the left-hand side navigation menu (it is an
icon that looks like gears).
3. Click to expand the "My Settings" folder.
4. Click "Account Settings".
5. Select the "Compose" tab.
6. Select the "Enable read receipts by default" checkbox.
7. Click "Save".
Once the recipient received the email from the sender, then he/she might see a read receipt as shown below:
Trouble logging in? Simply enter your email address below and we will send you an email that will allow you to reset your login.
For faster and more reliable delivery, add firstname.lastname@example.org to your trusted senders list in your email software.