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Your company has an Exchange Server 2016 organization. The organization contains 2,000 mailboxes and five
Mailbox servers, including one server named EX1.
Five hundred users retrieve email from their mailboxes by using an IMAP4 client application from the Internet.
The users also connect to EX1 to send email messages. All of the email messages are secured by using TLS.
An administrator recently replaced the company’s firewall.
Users now report that they fail to send email messages from the IMAP4 client application. You verify that the
users can retrieve email messages form their mailbox successfully.
You need to recommend which TCP port must be allowed so that the users can send email messages from the
IMAP4 application successfully.
Which TCP port should you recommend?

A.
443

B.
587

C.
993

D.
995

Explanation:
https://technet.microsoft.com/en-us/library/jj657728(v=exchg.160).aspx

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