Showing a question mark ‘?’ in the sender photo when a message is not authenticated

In order to help stop phishing messages, Office 365 and Outlook.com already filter messages using authentication methods including SPF, DKIM, DMARC, and antispoofing. These techniques verify that the sender is who they say they are, and they are used to mark the message either as Junk Email, or deliver it to your Inbox. They sometimes…

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