For example, when a message from a sender who’s SPF record is missing or not valid, it would show something like “The sender of this message could not be validated and may not be the actual sender” as shown in the following screenshot. In my previous blog External Senders with matching display names I explained a Transport Rule that checked for matching display names in order to prevent phishing and possible CFO Fraud.Īnother interesting solution with Transport Rules is displaying a warning message when the sender’s domain could not be validated.
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