Do cookies in email exist?

Email clients don't support traditional browser cookies. The email itself cannot set or read cookies like a website can. However, when recipients click links to your website, normal web cookies apply once they reach your domain.

What does exist in email: tracking pixels (1x1 images that log opens), unique link parameters (query strings identifying the recipient), and device/client fingerprinting based on how email clients render content. These provide tracking capability without cookies.

Apple's **Mail Privacy Protection** and other privacy features block or obscure these mechanisms. They pre-fetch images, mask IP addresses, and hide device information. So while email doesn't use cookies, equivalent tracking mechanisms face similar privacy scrutiny and technical countermeasures.