The functionality that allows a sender to receive a notification when an email recipient opens their message is known as a read receipt. This feature provides confirmation that the intended party accessed the sent communication. For example, a sales representative might utilize this to confirm that a potential client reviewed a proposal that was emailed to them.
The value of these confirmations lies in improved communication management and a better understanding of engagement levels. Historically, it was a feature requested to confirm the delivery and reading of critical business documents. However, reliance on it can be problematic because not all email systems support the feature, and recipients can often decline to send them. This can lead to inaccurate assumptions if the sender only relies on these receipts for confirmation.