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Your company subscribes to the Office 365 Enterprise E1 plan. You are the Microsoft Exchange Online administrator. In the last week, employees have reported that they are receiving non-delivery report messages from other companies. The employees have not sent messages to recipients within those companies. You need to prevent non-delivery report messages from reaching employees. Which content filter option should you turn on in the Exchange admin center?
Correct Answer: A
Explanation/Reference: Explanation: The non-delivery report messages the users are receiving are the result of Backscatter. Backscatter is the automated bounce messages that are sent by mail servers, typically as a result of incoming spam. Because Exchange Online Protection (EOP) is a spam filtering service, email messages sent to nonexistent recipients and to other suspicious destinations are rejected by the service. When this happens, EOP generates a non-delivery report (NDR) message and delivers it back to the "sender." Because spammers frequently use a forged or invalid "From" address in their messages, the sender address to which the NDR is sent may result in a backscatter message. References: http://blogs.technet.com/b/exchange/archive/2014/08/18/spam-email-and-office-365- environment-connection-and-content-filtering-in-eop.aspx