An end-user needs to configure their email client to retrieve messages securely. Which port should the client specify to establish a secure (SSL/TLS) POP3 connection to the mail server?
143
110
993
995
Port 995 is reserved for POP3 over SSL/TLS (often called POP3S). Selecting this port encrypts the session and protects credentials and message contents in transit. Port 110 is the default, unencrypted POP3 port. Ports 143 and 993 are associated with IMAP (143 is unencrypted; 993 is IMAPS) and therefore do not provide secure POP3 retrieval.
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