Which protocol uses port 110 for email services?

Port 110 is designated for the Post Office Protocol version 3 (POP3), which is a protocol used for retrieving email from a server. When a user wants to download their emails, their email client communicates with the server using POP3 over this specific port.

POP3's primary function is to allow users to download emails to their local devices, where they can be read even when offline. Unlike IMAP, which allows for more advanced email management by syncing directly with the mail server, POP3 focuses on downloading and, in some configurations, deleting emails from the server.

The other protocols serve different purposes: SMTP (Simple Mail Transfer Protocol) uses port 25 for sending emails; IMAP (Internet Message Access Protocol), which is often used for retrieving and managing emails, typically uses port 143 or port 993 for secure connections; and HTTP (Hypertext Transfer Protocol) operates primarily over port 80 for web traffic. Understanding the specific functions and the assigned ports for each protocol is essential for managing email services effectively.