FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -An IMAP server typically listens on port number 143. IMAP over SSL/TLS (IMAPS) is assigned the port number 993. Virtually all modern e-mail clients and servers support IMAP, which along with the earlier POP3 (Post Office Protocol) are the two most prevalent standard protocols for email retrieval.

Detailed explanation-2: -IMAP4 server FQDN: mail.contoso.com. TCP port: 993 for always TLS encrypted connections, and 143 for unencrypted connections or opportunistic TLS (STARTTLS) encrypted connections.

Detailed explanation-3: -Port 143 – Default IMAP port. Also used for TLS. Port 993 – IMAP port used for SSL.

Detailed explanation-4: -Internet Message Access Protocol Imap protocol is used by eMail clients for the retrieval of their eMail from designated eMail “post office” servers. Email Clients such as Microsoft Outlook, Netscape, Eudora, and many others, using imap protocol to retrieve their eMail, connect to port 143 of a remote eMail server.

Detailed explanation-5: -(Internet Message Access Protocol 4) A programming interface (API) from the IETF that enables a user’s email program to access the mail server (RFC 3501 standard).