Hello @LornaWright ,
Have any of the contacts included in the sent total been deleted from your account since sending to them? Have you used any functionalities like Quicksend to send an email to a contact after the email was initially sent?
I'd advise calling our general support so they can go over the reporting directly with you, and find any specific example contacts that aren't showing up between the total-send and open+DNO total. Or to see if our Tier 2 support team can run anything to try and identify the exact source of the discrepancy.
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