An email is marked as "opened" in our system when either a) the images automatically display, or b) if they click on a link in the email. So it is possible that in the process of deleting the email, if the images display automatically in the preview, that it will count as an "Open" even if it is being deleted. This article explains how it works when email opens are not trackable. If they have the images set to be manually displayed, then selecting and deleting it should not register as an opened email.
Nick S. Social Media & Content Manager
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