![]() ![]() Across the globe, that means over 166 billion emails are sent with trackers every day. (new window) One sample email analyzed sent tracking requests to 24 third parties, including major data brokers (new window).Īrmed with this data, big tech companies, advertisers, governments, or even criminal attackers can build detailed profiles of you (new window) - all without your consent.Īt Proton, we’ve found that almost 50% of all emails contain spy pixels (new window). Princeton researchers found that 70% of emails from mailing lists contain at least one tracker. Third, emails may contain several trackers that send information to multiple third parties, not just an individual sender. For example, you could get ads from a store if you had the store’s loyalty card linked to your email address. Second, as trackers can connect email addresses to your browsing histories and profiles, this “leads to further privacy breaches such as cross-device tracking and linking of online and offline activities”, as the Princeton research explains. The threat email trackers pose to your privacy goes far beyond an individual sender knowing when you opened an email, as a Princeton study of spy pixels (new window) has shown.įirst, by linking your email address, browser and device fingerprint (new window), and IP address with third-party tracking cookies, email trackers can be used to track your browsing activity across the web. But they can also be customized just for you, depending on the sender’s needs.Īd and tech companies have also developed custom tracking parameters that aren’t always documented, making it hard to tell what information they collect.Ĭlicking a tracking link in an email you receive can have a significant impact on your privacy because the advertiser already has your email address, which it can use to tie all your online activity together. Here’s a breakdown of a link with typical UTM tracking parameters. The most common tracking parameters are UTM (Urchin Tracking Module) parameters, which are supported natively by Google Analytics. Designed to track the effectiveness of marketing campaigns, tracking links can track your interactions with websites over time and between apps. Tracking linksĬompanies also try to track you with tracking links – URLs containing tracking parameters. But others may contain several tracking pixels to send information to multiple third parties (new window). ![]() Some emails contain a single spy pixel to collect limited information for the sender, for example, to measure the email open rate for a marketing campaign.
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