A customer states that since the new firewall has been installed, the customer has not been able to send email. Which of the following ports on the firewall should be checked?

The correct answer is B. 25. Port 25 is used by SMTP (Simple Mail Transfer Protocol), which is responsible for sending outgoing email between mail servers. If the firewall is blocking port 25, outbound email will fail. Port 110 is for receiving email via POP3, port 21 is FTP, and port 443 is HTTPS - none…

Networking

Question

Options

A21
B25
C110
D443

How the community answered

(32 responses)

A
3% (1)
B
91% (29)
C
6% (2)

Explanation

Port 25 is used by SMTP (Simple Mail Transfer Protocol), which is responsible for sending outgoing email between mail servers. If the firewall is blocking port 25, outbound email will fail. Port 110 is for receiving email via POP3, port 21 is FTP, and port 443 is HTTPS - none of these are involved in sending email.

Topics

#SMTP#port 25#email#firewall ports

Community Discussion

No community discussion yet for this question.

Full 220-801 Practice