A response from an email recipient that indicates the message was opened. The read receipt has to be requested by the sender, and the recipient may or may not comply. Although it is called a "read" receipt," there is no guarantee the person actually read any of the text. The message could have been opened and immediately trashed. Email client programs such as Outlook and Eudora support read receipt requests and responses, while Web-based email does not. For automatic read receipts, see
email tracker.