Which port and protocol is used for IMAP mail retrieval?

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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 IMAP mail retrieval?

Explanation:
IMAP retrieves mail using the IMAP protocol, and the standard unencrypted connection uses TCP on port 143. That port is defined for ordinary IMAP access to read and manage messages on the server. If the connection is secured with TLS/SSL, the IMAP service commonly runs on port 993 (IMAPS). The other options belong to different protocols or secure variants: 110 is POP3, and 995 is POP3S. So for typical IMAP retrieval, 143 TCP is the right choice, with 993 used when encryption is required.

IMAP retrieves mail using the IMAP protocol, and the standard unencrypted connection uses TCP on port 143. That port is defined for ordinary IMAP access to read and manage messages on the server. If the connection is secured with TLS/SSL, the IMAP service commonly runs on port 993 (IMAPS). The other options belong to different protocols or secure variants: 110 is POP3, and 995 is POP3S. So for typical IMAP retrieval, 143 TCP is the right choice, with 993 used when encryption is required.

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