Comment on Ask HN: How does my email tracking service know WHO opened my email?Comments−neximo643yEach one gets a different image in the email, when they open the email it fetches the image, so the tracking service knows they opened the email.The image is usually a 1px by 1px transparent png at the end of the email−dhbanesOP3yThanks for the insight.
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Each one gets a different image in the email, when they open the email it fetches the image, so the tracking service knows they opened the email.
The image is usually a 1px by 1px transparent png at the end of the email
Thanks for the insight.