Which of the following ports should the administrator open on the new firewall?

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A company is hosting a Windows email server on its premises Company policy is to use encryption on incoming and outgoing email services An administrator recently upgraded the company’s firewall Users report they can receive email, but no one can send email.

Which of the following ports should the administrator open on the new firewall?
A . 21
B . 80
C . 389
D . 465

Answer: D