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What Is SMTP Protocol? SMTP  Email is a method of communication. Nowadays, people around the world use email services. Exchange information with electronic devices is possible with email. The exchange of information can be between two people or a group of people. Let us know about a protocol related to transferring email. SMTP SMTP stands for Simple Mail Transfer Protocol. It is a protocol used to send email through the internet. Uses TCP (Transmission Control Protocol). It is an application-level protocol. It uses commands to mail authentication and transfer email. Examples of commands: HELO – It is the first command in SMTP. To identify the sender’s (server) domain name DATA – To send data of mail body by individual lines to the SMTP. RCPT – To identify the receiver of the email. Repeat the command with address for more than one receiver. MAIL – To start the transferring of the email. QUIT – To stop the conversation of SMTP How does SMTP work? The user fills in the content of the...