Enable Anonymous Relay on Exchange 2016

  • Open Exchange Admin Center and Navigate to Mail Flow > Receive Connectors
  • Create a new Receive Connector with following settings:
    • Role: Fontend Transport
    • Type: Custom

    • Network adapter bindings: All available (IPv4)
    • Remote network settings: [IP address of the device(s) that will be sending emails]
    • Finish
  • Open the new connector and modify settings in Security tab:
    • Authentication: Externally secured
    • Permission groups: Exchange Servers and Anonymous users

 

February 2018
Windows Server 2016
Microsoft Exchange 2016

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