Exam 70-345 topic 1 question 55 discussion

Actual exam question from Microsoft's 70-345

Question #: 55
Topic #: 1

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

Show Suggested Answer

Suggested Answer: C 🗳️
References:
https://technet.microsoft.com/en-us/library/jj657728(v=exchg.160).aspx

by vthai at Aug. 9, 2019, 10:04 a.m.

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vthai

Highly Voted 5 years, 9 months ago

Port 993 is used to receive message on secure IMAP4 protocol. Port 587 is used to send message on secure SMTP protocol. As the question concernes the TCP port to send message, so the answer should be B, port 587.

upvoted 11 times

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Harry83

Highly Voted 4 years, 4 months ago

Answer B (port 587). IMAP4 protocol only permit to receive email (we cannot send anything with IMAP). As soon as we are talking about sending the protocol is SMTP or SMTPs. Port 587 is an alternate port for SMTP sending (reserved for this type of SMTP/POP or SMTP/IMAP scenario).

upvoted 6 times