Hello @KarenB3839 ,
When I click to View Contacts under the pre-built engagement segmentations, it's able to calculate and show the lists. Are you not seeing this when you click that option?
If you're wanting a more custom segmentation, then I'd advise creating your own, with criteria based on opens and a more specific email range - such as a specific email sent, last 5 sent, or all emails sent within a particular date range. From there you can send an email to the segment, or add them to a list for a more targeted and efficient mass-deletion.
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