When does Mailtrack consider an email to have been read? February 18, 2020 15:14 Mailtrack classifies an email as having been read when our tracking pixel (a 0x0 .png image file) has been downloaded, which mostly occurs because the mail has been opened by its intended recipient. Related articles Tracking mails sent prior to installing Mailtrack 1st Open Email alerts Why does Mailtrack Free add a signature ad to the emails I'm sending? What does unlimited tracking mean? How do I disable Mailtrack for certain emails?