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
C: port 993
https://kb.intermedia.net/article/824
The link you provided has the correct information:
Use the following type of Encrypted connection (for Incoming Server): SSL (port number changes automatically to 993 for IMAP; to 995 for POP)
Use the following type of Encrypted connection (for Outgoing Server): TLS (you can use ports 25, 465 or 587).
Note: You can also increase server timeout setting to improve performance.
Answer in this case is B: 587 for sending via SMTP
B. 587 = Users can retrieve message so 993 (secured IMAP4) is already working, they need to be able to send with SMTPS so 587 must be allowed
Agree with Mat for option B.
Configure authenticated SMTP settings for POP3 and IMAP4 clients in Exchange 2016
https://technet.microsoft.com/en-us/library/gg298947(v=exchg.160).aspx
I accept with Mat (Option B)..
Only for incoming, port 993 is used and is clearly stated that they are able to retrieve the message, but just can’t send. The outgoing port should be SMTP and since it a secure SMTP connection, its should be port number 587.
I mean for TLS connection, 587 to be used.
I now agree with both of you. Great work!
This links furthers your point (table for port 587 – StartTLS)
https://technet.microsoft.com/en-us/library/jj984168(v=office.16).aspx
I got question with Azure AD ports (80,443,…) choose 2 options