What is SMTP (Simple Mail Transfer Protocol)? Examples & Working with Commands

SMTP stands for ‘Simple Mail Transfer Protocol’. It is an email protocol that uses for sending email messages from one email account to another over the internet. Now, here we will explain about what is SMTP (Simple Mail Transfer Protocol) and its example; involving with working of SMTP protocol with their commands with ease.

What is Simple Mail Transfer Protocol?

DefinitionSMTP works on the application layer of TCP (Transmission Control Protocol) protocol. SMTP protocol helps to send all emails on the Internet. Next, Mail Transfer Agent (MTA) forwards your email on appropriate computer. 

Full form of SMTP is “Simple Mail Transfer Protocol”. This system is using in the Computer networking for sending and receiving emails.

SMTP is group of few communication rules that permits to email client such as (Outlook, Eudora, etc). They push email messages over the remote email server. And, those servers enabled with SMTP that assist to emails over the identified receiving email server. SMTP protocol is capable to move one message on one or multiple recipients, and moving emails can enable with (text, video, image or audio).

Also Read: What is POP3 (Post Office Protocol)? POP3 Full Form | Advantages & Disadvantages

SMTP Protocol Tutorial Headlines:

In this section, we will show you all headlines about this entire article; you can check them as your choice; below shown all:

  1. What is Simple Mail Transfer Protocol?
  2. Architecture of SMTP Protocol
  3. Working of SMTP
  4. SMTP Protocol Method
  5. SMTP Commands
  6. Components of SMTP
  7. FAQs (Frequently Asked Questions)
  • What is smtp protocol in networking?
  • What is the main purpose of SMTP?
  • What is the SMTP protocol is used for?
  • What applications use SMTP?
  • What is the example of SMTP server?

Let’s Get Started!!

Architecture of SMTP Protocol

In this SMTP concept, all users use the User Agent (UA) programs such as Outlook, Netscape, Mozilla and more. MTA (Mail User Agent) helps to exchange all messages between both (edges sender and receiver) with using the TCP/IP.

System administrator has authority to configure set up of local MTA. So, users don’t responsible to move email with using MTA. MTA (Mail User Agent) keeps the queue in pool of messages, if receiver is not available at that moment then MTA can make to schedule for repeating the delivery of all messages. MTA forwards the emails into mailboxes of users’ local system, and then user agent (UA) can download those messages any time.
smtp protocol

Working of SMTP

SMTP protocol’s working has five segments, such as:

Also Read: What is TCP (Transmission Control Protocol): Working and Functions of TCP!!

Composition of Email – Users compose the all e mail messages, and then they send those composed massages with using of MUA (Mail User Agent). Mail User Agent is software that helps to move and access emails. The email message has two segments such as “body and header”. Body segment contains the main message area, and other side Header enables with sender and recipient address as well as it also contains the main heading of message like as subject of email.

Submission of Email – When users compose email completely then they move the entire email to SMTP (Simple Mail Transfer Protocol) server on the TCP/IP PORT 25.

Delivery of Email – After submission of email, MSA will move messages to MTA. Then Mail Transfer Agent is going to identify the destination domain and IP (Internet Protocol) of recipient’s domain name from “Domain Name System”. After locating the recipient’s domain, MTA makes connection to server for broadcasting messages.

Receipt and Processing of Mail – After receiving the messages by recipient, and then data exchange server forwards that message to MTA (Mail Delivery Agent) which saved all emails.

Access and Retrieval of Mail – All email already saved in the MDA, and these messages can access by the MUS (Mail User Agent).

SMTP Protocol Method

SMTP (Simple Mail Transfer Protocol) is base on the two methods, such as –

End To End – End to End method implements in between the multiple dissimilar organizations.  In this method, firstly to make contact directly by SMTP client with destination host SMTP then to send the messages destination terminal.

Store and Forward – This method is applicable, if exchange the message between same organization. In this method, SMTP client can’t send messages directly to destination point because firstly those messages stored on the server then their copy of those messages move to destination email box.

SMTP Commands

Here, we will discuss about few SMTP’s Commands, like as –

Also Read: Application Layer in OSI Model: Functions, Protocols, Examples, & Services!!

HELLO – To find the appropriate path client to server, with qualified domain name, as well as one session sent at one time.

MAIL – Take decision for sending messages by domain of originator.

RCPT – To find the destination address, and several addresses can use single RCPT to every addressees.

DATA – Now finally, entire data will send frequently line by line.

Components of SMTP

SMTP protocol has mainly three components, such as –

Also Read: What is Client Server Network? Advantages, Disadvantages, & Examples!!

  • User Agent (UA)
  • Mail Transfer Agent (MTA)
  • Mail Gateway

Entire functionality of SMTP protocol is based on these components. Explain below each one –

  • Main task of User Agent is to create message, and it makes the envelope then insert that message into envelope. Now finally, Mail Transfer Agent moves this message over the internet.
  • SMTP protocol can also allow multiple MTA like as extra MTA attached with sender edge and other MTA linked with receiver edge, and due to use of addition MTA, massive emails can send over the internet.
  • Without using of TCP/IP protocol, users can send their messages over the internet with using of Mail Gateway. Mail Gateway works as Relay MTA that helps to access all emails.

FAQs (Frequently Asked Questions)

What is smtp protocol in networking?

SMTP stands for ‘Simple Mail Transfer Protocol’; it is an application that is going to use to send, receive, and transmission emails in between senders and receivers. Whenever, you send the email then it allows to transfer it over the internet from one server to another by using of SMTP.

What is the main purpose of SMTP?

The main objective of using the SMTP is to send and receive the email.

What is the SMTP protocol is used for?

SMTP is a special protocol that is used to transfer e-mail messages and attachments in between the email servers and from email clients to email servers like as Microsoft Exchange.

What applications use SMTP?

Most common email clients are using like as Outlook, Apple Mail, Gmail, and Yahoo Mail.

What is the example of SMTP server?

SMTP email server has an address that can be formatted by the mail client or application that are going to use as smtp.serveraddress.com. For example is that SMTP server Gmail uses is smtp.gmail.com and Twilio SendGrid’s is smtp.sendgrid.com

Wrapping Up

Through this article, you have been completely learnt about what is SMTP (Simple Mail Transfer Protocol) and its example; involving with working of SMTP protocol with their commands with ease. If this post is valuable for you, then please share it along with your friends, family members or relatives over social media platforms like as Facebook, Instagram, Linked In, Twitter, and more.

Also Read: Peer to Peer (P2P) Network? Architecture, Types, and Examples!!

If you have any experience, tips, tricks, or query regarding this issue? You can drop a comment!

Happy Learning!!.

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