There are a few ways to determine if an email has been read, including:
1. Read receipts: Some email clients, such as Microsoft Outlook, allow users to request a read receipt when sending an email. When the recipient opens the email, they will be prompted to send a receipt back to the sender, indicating that the email has been read.
1. Email tracking software: There are third-party email tracking services that can be used to track emails. These services typically embed a small image or pixel into the email, which sends a notification back to the sender when the email is opened.
1. Delivery and open rates: Many email marketing platforms track the delivery and open rates of emails sent through their service. This data can be used to determine if an email has been opened.
In terms of the technical description of the process, when an email is sent, it is transmitted over the Internet using various protocols (such as SMTP and POP). The email is then delivered to the recipient’s email server, where it is stored until the recipient opens it. If a read receipt is requested, the recipient’s email client will typically send a notification back to the sender via email or through the email tracking service embedded in the email.
