Which of following is default port of POP3 protocol?

The correct answer is 110.

Key Points

• The full form of the POP3 is Post Office Protocol version 3.
• It is referred to as a simple mail protocol. The main job of the POP3 is to retrieve or copy mail from a remote server and then send that email to the specific local client. 
• POP3 is not programmed for handling and synchronising the mail in the user's mailbox throughout multiple devices. 
• There are two ports used for POP3. These are given below:
  • Port 110- By default POP3 uses Port 110 for retrieving mail.
  • Port 995- POP3 port 995 is used in SSL/TLS.

 Thus the correct answer is 110.