YoudeployanewExchangeServer2010organization.Yousendatestmessagetoanexternalrecipientandimmediatelyreceivethefollowingnondeliveryreport（NDR）DeliveryhasfailedtotheserecipientsorgroupsUser1@contoso.com（user1@contoso.com）.
Therecipient’se-mailsystemisn’tacceptingmessagesnow.Pleasetryresendingthismessagelaterorcontacttherecipientdirectly.±Youverifythatyoucansuccesfullysendane-mailmessagetoUser1@contoso.comfromanexternale-mailsystem.Youneedtoensurethatyoucansende-mailstoexternalrecipientsfromwithintheExchangeorganization.
Whatshouldyoucreate？（）
参考答案：A
