YouhaveanExchangeServer2010organizationnamedContoso.comthatcontainsamail-enabledDomainLocalgroupnamedGroupUsersfromoutsidetheorganizationreportthatalle-mailmessagessenttogroup1@contoso.comgenerateanon-delivery-report（NDR）.Youneedtoensurethatusersfromoutsidetheorganizationsende-mailtogroup1@contoso.com.Whatshouldyoumodifyforgroup1？（）
A.Advancedsettings
B.Groupscope
C.Grouptype
D.Themailflowsettings
参考答案：D
