Easy! IT | Protocol | Simple Mail Transfer Protocol

This article is a rough explanation of the Simple Mail Transfer Protocol.

Everything might be not exactly correct in this article but it’s very useful for beginners to understand IT terms. If you want to learn IT but you don’t have any experience to work in the IT industry, I wish it helps you to understand IT. And I hope this article makes you study IT more.

Let’s start our 3 minutes lesson!

What is the Simple Mail Transfer Protocol?

The Simple Mail Transfer Protocol is an internet standard communication protocol.
SMTP is the abbreviation for the Simple Mail Transfer Protocol.
SMTP is used to send emails from an email client to mail servers.

1.Simple Mail Transfer Protocol(SMTP)

The Simple Mail Transfer Protocol(SMTP) is the protocol that allows you to send emails to a mail server.

A protocol is a set of rules used by computers that are connected or networked together, which specify how the computers communicate or interact with others.

How does SMTP work?

You use this protocol to send emails from your email client to your email provider’s mail server or your own mail server.

SMTP COMMAND

SMTP command is used when an SMTP server and an SMTP client communicate with each other. The main command is as follows:

EHLO(or HELO)

Identify the domain name of the sending host to SMTP.

MAIL

Specify the sender of the mail.

RCPT

Specify the recipients of the mail.

DATA

Define the following information as data.

QUIT

End an SMTP connection.

RSET

Reset the SMTP connection to the initial state.

NOOP

Return a 250 OK return code when SMTP is responding.

HELP

Get help with SMTP commands.

Transfer emails between SMTP servers

When users use the different mail servers, the mail server sends to the mail server which a target user uses. In this case, the first SMTP server works as an SMTP client and the SMTP server which receives the mail works as an SMTP server.