A.ThecompanyfirewallisblockingSMTPports.
B.TheDHCPserverismisconfigured.
C.TheDNSserverisonlyresolvinginternalnamespaces.
D.TheemailservershouldbeconfiguredtoresolvenamesbyIPaddresses.
参考答案：A
AThecompanyfirewallisblockingSMTPportsBTheDHCPserverismis
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