单项选择题
You have a Hub Transport server named Server1 that runs Exchange Server 2010.All Exchange users use IMAP4 to retrieve e-mail.You need to ensure that all users can send e-mail by using SMTP.Your solution must not require any modifications to the default connectors.
What should you do?()
A.Configure IMAP4 clients to send e-mail by using TCP port 25.
B.Configure IMAP4 clients to send e-mail by using TCP port 587.
C.Create a new Send connector and configure the connector to use port 110.
D.Create a new Send connector and configure the connector to use port 143.
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