2021 was a watershed year for email privacy. Apple’s (MPP) launched in September 2021, pre-loading all images and destroying pixel accuracy. Yahoo Mail did not adopt MPP, but the cultural shift affected users:
In 2021, no reliable, fully functional version of Mailtrack existed for Yahoo Mail . Users seeking read receipts had to resort to: mailtrack for yahoo mail 2021
: Receive desktop or email notifications the moment a recipient opens your message [9]. Device Tracking 2021 was a watershed year for email privacy