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 1st Open Email alerts Tracking mails sent prior to installing Mailtrack 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?