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POP3

The Post Office Protocol version 3 (POP3) is an application-layer Internet standard protocol used to retrieve e-mail from a remote server over a TCP/IP connection and store them on one's personal computer hard disc, in contrast to the IMAP protocol that leaves the messages on the server. POP3 uses TCP on network port 110. POP3S (POP3 over SSL) uses SSL to encrypt and secure the communications on port 995.