![]() This and other characteristics of IMAP operation allow multiple clients to manage the same mailbox. While some clients and servers preferentially use vendor-specific, proprietary protocols, almost all support POP and IMAP for retrieving email – allowing many free choice between many e-mail clients such as Pegasus Mail or Mozilla Thunderbird to access these servers, and allows the clients to be used with other servers.Įmail clients using IMAP generally leave messages on the server until the user explicitly deletes them. The user retrieves the messages with an email client that uses one of a number of email retrieval protocols. Incoming email messages are sent to an email server that stores messages in the recipient's email box. An IMAP server typically listens on well-known port 143, while IMAP over SSL/TLS (IMAPS) uses 993. The current version is defined by RFC 9051. The Internet Message Access Protocol is an application layer Internet protocol that allows an e-mail client to access email on a remote mail server. Many webmail service providers such as Gmail and also provide support for both IMAP and POP3. ![]() 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. IMAP over SSL/TLS ( IMAPS) is assigned the port number 993. ![]() An IMAP server typically listens on port number 143. 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. 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.
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