How does ActiveCampaign track opens?

We track opens on all html-based campaigns (emails created using the drag-and-drop designer or your own custom code) by embedding an invisible, 1-pixel image in your campaign. When a contact opens your email and chooses to display the images in your email, that graphic is downloaded from our server and it's recorded as an open.

Note: It is not possible to track opens for plain-text emails.

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