To make sure that your email has been read by the addressee, you need to send them a read confirmation receipt.
To get a read confirmation receipt from the recipients of an email, click the button at the bottom of the creation window.
When opening an email, the recipients of the email will see a notification:
To close the notification, the recipient should press one of the buttons located in the window:
• A read receipt will be sent to the sender of the email.
• The sender will not receive a read receipt but the next time the email is opened, the recipient will see the notification again.
• A read receipt will not be sent to the sender.