Hello @CharlesM89 ,
Quite simply, those contacts are not opening your emails. Generally we recommend keeping an eye on these contacts, and after sending enough emails out, you may wish to get rid of these contacts. That way you aren't paying for contacts who aren't engaging with your material.
If desired, you can segment out contacts who haven't opened your emails, then add them to a list for deletion.
William D
Community & Social Media Support
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