While effective, this raised ethical questions. Mailtrack responded by promoting an "Ethics" setting, which allowed users to include a small signature at the bottom of their emails stating they were using tracking. For Yahoo users in professional settings, this became a best practice to maintain trust and transparency.
While Yahoo doesn't make it easy out of the box, using tools like MailSeen or the Gmailify workaround ensures you never have to "fly blind" with your sent folder again. mailtrack for yahoo mail 2021