You work as the enterprise exchange administrator at Company.com.The Company.com network consists of a single Active Directory domain named Company.com.Company.com has an Exchange Server 2010 organization.Company.com contains a mail-enabled group named TestGr1.You have received complaints from the employees not residing inside the company, that their e-mail messages sent to TestGr1@contoso.com produce a non-delivery report (NDR).You need to adhere to the problem.What should you do?()
A.The best option is to change the authentication settings for the Client Receive connector.
B.The best option is to change the moderation settings for TestGr1.
C.The best option is to change the remote IP address range for the Client Receive connector.
D.The best option is to change the message delivery restrictions for TestGr1.