You have an Exchange Server 2016 organization. The organization contains an Edge Transport server.
Users report that a message with the following anti-spam headers is delivered to their Inbox folder in Microsoft Outlook.
X-MS-Exchange-Organization-PCL:7
X-MS-Exchange-Organization-SCL:6
X-MS-Exchange-Organization-Antispam-Report: DV: 3.1.3924.1409; SID: SenderIDStatus Fail; PCL:
PhishingLevel SUSPICIOUS; CW: CustomList; PP: Presolved; TIME: TimeBasedFeatures You need to prevent similar messages from being delivered. The solution must generate a non-delivery report (NDR) when the messages are prevented from being delivered to all user mailboxes.
What should you do?