Question

While configuring a new email application that uses POP3 for a customer, the technician determines the firewall is blocking the traffic. Which of the following ports should be opened to allow POP3 mail traffic through the firewall?

A. 53
B. 110
C. 443
D. 3389

Answer 1

Final answer:

To allow POP3 mail traffic through the firewall, you should open port number 110 for unencrypted POP3 connections or port 995 for encrypted ones.

Step-by-step explanation:

To allow POP3 mail traffic through the firewall, you should open port number 110. This is the standard port used for unencrypted POP3 communication, which is what email applications use to retrieve emails from a server.

However, if the email application uses an encrypted connection with POP3 over SSL/TLS, you would need to open port number 995 instead.

It's important to configure the correct port based on whether the connection is encrypted or not to ensure the security and functionality of the email service.

Here's a quick reference for the given options:

• Port 53 is typically used for DNS services.
• Port 110 is used for unencrypted POP3 email traffic.
• Port 443 is commonly used for HTTPS traffic, which is encrypted web traffic.
• Port 3389 is used for Remote Desktop Protocol (RDP) to connect to and control remote computers.