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When a recipient looks at a message in the Outlook (desktop) preview window only, does that count as 'opened' in the Sendy report?
If images are displayed and loaded, it will be tracked as 'opened'.
But what if there are no images in the newsletter?
A 1x1pixel invisible image is embedded in every newsletter for 'opens' tracking and other data. This 1x1pixel invisible image will always be embedded in campaigns you send and irregardless of whether there are other images in the email.