Or, if you recognize a sender that normally doesn't have a '?' in the sender image, but you suddenly start seeing it, that could be a sign the sender is being spoofed. However, you should be careful about interacting with messages that don't authenticate if you don't recognize the sender. Not every message that fails to authenticate is malicious. When Outlook can't verify the identity of the sender using email authentication techniques, it displays a '?' in the sender photo. Outlook shows indicators when the sender of a message is unverified, and either can't be identified through email authentication protocols or their identity is different from what you see in the From address.
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