An office email client can send messages through the SMTP server but fails to retrieve new mail using the IMAP protocol. The network administrator suspects the perimeter firewall is blocking the default IMAP port. Which port number and transport protocol should be allowed to restore connectivity?
IMAP listens on TCP port 143 by default. Opening this TCP port on the firewall allows the client to establish a connection for folder synchronization and message retrieval. UDP is not used by IMAP, and port 110 is associated with the POP3 protocol rather than IMAP, so permitting any of those combinations would not solve the problem.
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What is the purpose of IMAP in email communication?
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Why does IMAP use TCP instead of UDP?
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How is port 110 different from port 143 in email protocols?