What is the default port number for IMAP?

The default port number for IMAP (Internet Message Access Protocol) is 143. IMAP is used for retrieving and managing emails from a mail server. While some related protocols may use different ports, IMAP specifically utilizes port 143 for standard unsecured communications.

Port 110 is used by POP3, another email retrieval protocol that allows clients to download emails from a server. Port 25 is reserved for SMTP (Simple Mail Transfer Protocol), which is concerned with sending emails rather than retrieving them. Port 389 is the LDAP (Lightweight Directory Access Protocol) port and is unrelated to email retrieval.

Thus, recognizing IMAP's standard port (143) is crucial for configuring mail clients, understanding email server settings, and troubleshooting email connectivity issues. Understanding ports in these contexts helps in managing email infrastructure and securing email communications effectively.