Which port and protocol is used for POP3S mail retrieval over SSL?

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Prepare for the CPSA Port Numbers Exam with quizzes on port numbers, services, and protocols. Each question is accompanied by hints and detailed explanations. Get exam-ready with our comprehensive study tool!

Multiple Choice

Which port and protocol is used for POP3S mail retrieval over SSL?

Explanation:
POP3S stands for POP3 over SSL/TLS, so it uses TCP port 995 for secure mail retrieval. The other ports map to different protocols or non-secure variants: port 110 is plain POP3, port 143 is standard IMAP (often unsecured, though can use STARTTLS), and port 993 is IMAPS (IMAP over SSL/TLS). Therefore, for secure POP3 retrieval, the correct combination is port 995 TCP.

POP3S stands for POP3 over SSL/TLS, so it uses TCP port 995 for secure mail retrieval. The other ports map to different protocols or non-secure variants: port 110 is plain POP3, port 143 is standard IMAP (often unsecured, though can use STARTTLS), and port 993 is IMAPS (IMAP over SSL/TLS). Therefore, for secure POP3 retrieval, the correct combination is port 995 TCP.

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