The POP3 ( Post Office Protocol - Version 3 ) protocol uses port number 110.

Commands :

user name     - enter login name
pass string   - enter password
stat          - show statistics of email account
list [n]      - list statistics of all messages
                or message number n
top  n nlines - show header of message number n
                and n lines of the body
retr n        - show header and body of message number n
dele n        - delete message number n
rset          - unmark deleted messages
quit          - close and quit transmission