https://senderaudit.com/blog/en/tags/tracking/Recent content in Tracking on Sender Audit BlogHugoenMon, 04 May 2026 00:00:00 +0000https://senderaudit.com/blog/en/email-trackers-pixels-privacy/Mon, 04 May 2026 00:00:00 +0000https://senderaudit.com/blog/en/email-trackers-pixels-privacy/<p>Every marketing email you receive likely contains one or more invisible trackers. They measure whether you opened the message, when, how many times, from which device, and which links you clicked. Here&rsquo;s how it works - and how to do better.</p> <h2 id="how-open-tracking-works">How open tracking works</h2> <h3 id="the-spy-pixel-an-invisible-image">The spy pixel: an invisible image</h3> <p>The mechanism is straightforward: the sender inserts a 1×1 pixel transparent image hosted on their server. When your mail client renders the message, it downloads the image. The server records:</p>