Email Open Tracking

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BEWARE of privacy concerns

Open tracking is the process of detecting when a recipient opens an email. It helps gauge the overall engagement.

Tracking email opens is increasingly unreliable because many email clients (like Apple Mail and Gmail) preload or block images by default, which triggers false opens or hides them entirely. As a result, open rates no longer accurately reflect whether a recipient actually viewed the email.

How It Works

Tracking pixel: We insert a tiny, invisible image (usually a 1x1 pixel image) into the email.
Image load = open: When the recipient opens the email and their email client loads images, the pixel is loaded from our server.
Server log: We record this image request as an "open."

Enable open tracking for all emails

Within your account head over to the Account Settings page and enable Track email opens. By default all e-mail opens in all e-mails will now be tracked.

Enable or disable open tracking for individual emails

You can override the account wide setting to track all opens by adding a header to your emails.

Set the seseu-track-opens header to false to disable open-tracking for an individual email message.
Set the seseu-track-opens header to true to enable open-tracking for an individual email message. Even if open tracking has been disabled in your account.

The header will be removed before the email is delivered.