Exchange Distribution Groups – Receiving External emails not working

Exchange 2007 have a default behavior : when you create a new distribution group and try to send an email from an external address, the email is not receiving by this group. Internal email are working :

To change this setting go to :

  • Exchange Management Console
  • Select the distribution Group, Right-Clic, Properties
  • Select Mail Flow Settings Tab
  • Select Message Delivery Restrictions and Properties
  • Remove the check box : Require that all senders are authenticated.

Clic Ok, and test!

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