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

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Study for the CPSA Port Numbers Exam. Practice with flashcards and multiple choice questions, each with hints and explanations. Get ready for your test!

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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