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

Explanation:
IMAPS is the secure version of IMAP, using SSL/TLS from the moment the connection is established. The standard port for this secure IMAP retrieval is TCP 993, which is why that option fits best for accessing mail over SSL. The other ports correspond to different services or variants: 143 is regular IMAP (often used with STARTTLS to upgrade encryption, not the encrypted-by-default IMAPS); 110 is POP3 (basic mail retrieval, not IMAP); 995 is POP3 over SSL (the secure variant of POP3, not IMAP).

IMAPS is the secure version of IMAP, using SSL/TLS from the moment the connection is established. The standard port for this secure IMAP retrieval is TCP 993, which is why that option fits best for accessing mail over SSL.

The other ports correspond to different services or variants: 143 is regular IMAP (often used with STARTTLS to upgrade encryption, not the encrypted-by-default IMAPS); 110 is POP3 (basic mail retrieval, not IMAP); 995 is POP3 over SSL (the secure variant of POP3, not IMAP).

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