FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -SMTP (Simple Mail Transfer Protocol) is a TCP/IP protocol used in sending and receiving email. SMTP is used most commonly by email clients, including Gmail, Outlook, Apple Mail and Yahoo Mail. SMTP can send and receive email, but email clients typically use a program with SMTP for sending email.

Detailed explanation-2: -TCP/IP provides a reliable, flexible email system built on a few basic protocols. These are: Simple Mail Transfer Protocol (SMTP), Post Office Protocol (POP), and Multipurpose Internet Mail Extensions (MIME). There are other TCP/IP mail protocols. However, these are the basic mail protocols.

Detailed explanation-3: -SMTP is the TCP/IP mail delivery protocol. It moves mail across the Internet and across your local network. SMTP is defined in RFC 821, A Simple Mail Transfer Protocol. It runs over the reliable, connection-oriented service provided by Transmission Control Protocol (TCP), and it uses well-known port number 25.

Detailed explanation-4: -Communication between mail servers generally uses the standard TCP port 25 designated for SMTP.

Detailed explanation-5: -The user’s command or message passes through the TCP/IP protocol stack on the local machine, and then across the network media to the protocols on the recipient. The protocols at each layer on the sending host add information to the original data.