Proxy Opened eMail (Mail Privacy Protection)

I have a contact on the aol.com domain who tells me she is no longer receiving our emails for the last few months. When I look at the Activity Log for this contact, I see the following message: "Proxy opened email (Mail Privacy Protection)". She has been an active contact for us since 2017. She has checked her spam/junk folder and our emails are not there.

Can anyone advise what is going on here and how I can resolve this?

Bill N

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