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You have an Exchange Server 2010 organization named Contoso.com that contains a mail-enabled Domain Local group named Group1.Users from outside the organization report that all e-mail messages sent to group1@contoso.com generate a non-delivery-report (NDR).You need to ensure that users from outside the organization send e-mail to group1@contoso.com. What should you modify for group1?()

A.Advanced settings
B.Group scope
C.Group type
D.The mail flow settings

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