Official comment
Hi Sekai,
I see that you emailed everyone on your list. One contact has a hard bounced email and the other is opted out (transactional only). You may log in to your account to see the people with that bulk email status.
As for seeing who did receive an email you can pull a group like this:

If you're looking for the inverse group you can pull the group that did receive the email using the criteria above, tag them, then find everyone in your DB without that tag.
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