Email tracking using pixels involves embedding a tiny image in the HTML content of an email. This image is hosted on a tracking server and includes unique identifiers in its URL. When the recipient opens the email, and their email client loads the images, it sends an HTTP request to retrieve this pixel. This action logs the event on the server, recording details such as when the email was opened and the recipient's IP address. This method helps track email open rates and user engagement; however, it can generate false positives if email clients or security tools automatically load images. To counteract tracking, some email services block images or load them through their own servers to obscure tracking methods.
Here are various factors that can cause open tracking to yield false positives.
1. Image Loading by Email Clients:
Automatic Image Display: Some email clients automatically load images, which can trigger the tracking pixel even if the recipient does not actually open the email.
Preloading: Some email services preload images for emails in the inbox to improve user experience, activating the tracking pixel without the email being manually opened.
2. Spam Filters and Preview Panes:
Spam Filters: If an email lands in the spam folder, the email service might still load images or parts of the email to assess its content, thereby triggering the tracking pixel.
Preview Panes: Many email clients have a preview pane that displays part of the email content without officially "opening" it. If this pane loads images, it can count as an open.
3. Mobile Devices and Apps:
App Behavior: Some mobile email apps might load images automatically to improve the user experience or check email content for notifications, potentially registering an open even if the user didn't view the email.
4. Proxy Servers and Network Security:
Proxy Servers: If users access emails through proxy servers that cache content, images might be loaded once and counted as multiple opens.
Network Security Tools: Tools that scan emails for security or compliance might load images, mistakenly indicating an email has been opened. This can happen for both outgoing and incoming mail server filters.
5. Email Forwarding:
When an email is forwarded, the recipient's email client might activate the tracking pixel, even if the original recipient didn't open the email.
6. Browser Extensions and Plugins:
Extensions automatically loading images or content for accessibility or privacy reasons can trigger the tracking pixel.
7. Multiple Devices:
If an email account is accessed from multiple devices, each might load the email independently, causing multiple "open" events for what was one actual read.
8. Email Client Bugs or Misconfigurations:
Sometimes, bugs in email client software or misconfigurations can cause images to be loaded under conditions not intended by the user.
9. HTML Rendering:
Even if images are not displayed (due to settings or policies), some email clients might still request the image to render the HTML correctly, thus triggering the tracker.
10. Unintended User Activity:
Tracking pixels may inadvertently be copied from a previously sent email and embedded elsewhere.
11. Mail Privacy Applications:
Apple's Mail Privacy Protection program downloads outbound emails to Apple's servers. When the recipient opens the email, it is loaded from these servers. As a result, this can trigger an open notification when the email is first downloaded to Apple's servers. To track these messages accurately, you may need to disable this feature in your Apple device settings if your mailbox is connected to an Apple device.
Our email tracking technology is an industry standard and offers valuable insights. However, because spam filters and other mechanisms can lead to false-positive open rates, it's advisable to use open tracking primarily to identify trends at scale rather than relying on it for complete accuracy in determining whether a prospect has genuinely opened and read a specific email.