Internet Message Access Protocol

Application layer protocol for e-mail retrieval and storage / From Wikipedia, the free encyclopedia

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In computing, the Internet Message Access Protocol (IMAP) is an Internet standard protocol used by email clients to retrieve email messages from a mail server over a TCP/IP connection.[1] IMAP is defined by RFC 9051.

IMAP was designed with the goal of permitting complete management of an email box by multiple email clients, therefore clients generally leave messages on the server until the user explicitly deletes them. An IMAP server typically listens on port number 143. IMAP over SSL/TLS (IMAPS) is assigned the port number 993.[2][3]

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.[4] Many webmail service providers such as Gmail and also provide support for both IMAP and POP3.

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