I have a couple of email recipients on the "hotmail.com" domain using an iPhone to open their mail. They are saying that they are not receiving emails. When I look at the Activity Log for these contacts, I see the following message: "Proxy opened email (Mail Privacy Protection)". I am not sure if this is coming from Hotmail or the iPhone iOS, or a combination. Anyway, these contacts say that they do not see the emails in their In Box. Anyone seen this before?
What does 'opened by proxy' mean, and why do some say they didn't receive?
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