Internet Message Access Protocol, version 4 (IMAP4): In computing, The IMAP is an internet standard protocol used by email clients to retrieve email messages from a mail server over a TCP/IP connection. The current version of IMAP is version 4. 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 (IMAPS) is assigned port number 993.
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Simple Mail Transfer Protocol (SMTP): SMTP known as an outgoing address is an Internet standard protocol for electronic mail transmission where mail is sent from the client to the mail server. SMTP is used to send mail; POP3 is used to receive mail, SMTP by default uses TCP port 25 and when secured by SSL also known as SMTPS uses default port 465.
Although electronic mail servers and other mail transfer agents use SMTP to send and receive mail messages, user-level client mail applications typically use SMTP only for sending messages to a mail server for relaying.
Transport Layer Security (TLS)/Secure Socket Layer(SSL): TLS and its predecessor, SSL both of which are frequently referred to as SSL. TLS are cryptographic protocols that are used to enabling secure online data transfer processes such as surfing web sites, downloading form sites, sending messages across the network, etc.
Most web sites use TLS for setting secure communication between their servers and web browsers client. The primary goal of the TLS protocol is to provide privacy and data integrity between two communicating computer applications.
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