What is SMTP Protocol in Networking? – SMTP (Simple Mail Transfer Protocol) is used to send Emails over the Internet or on large business networks. The SMTP protocol was developed in the early 1980s.
What is SMTP Protocol in Networking?

What is SMTP Protocol in Networking?

What is SMTP Protocol in Networking?

Today, the most popular service used to send Email is SMTP. Simple Server Simple Mail Transfer Protocol (SMTP) is used to send email from one server to another server over the Internet.

In short, SMTP is used to send an electronic post (E-Mail) between different hosts. SMTP is an Application Layer protocol. SMTP performs a TCP connection to send mail to a remote server.

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How SMTP Works?

SMTP also listens to the port 25 while performing a TCP connection. The SMTP client connects via this port (25) to send mail. When the TCP connection is successful, the SMTP protocol Request and Response initiate two processes. In this process, sender and receiver mail addresses are determined. Later, when the SMTP server accepts mail addresses, the SMTP client sends the mail to the recipient.

In an Email, there must be a message header and a message body.

A host must be running the SMTP server to receive the Email. The user can receive Email messages using Post Office Protocol (POP) and Internet Message Access Protocol (IMAP).

The Mailbox program must be installed to send and receive Email on the user’s computer. The user with the postbox program has to use POP or IMAP services to get SMTP and Email for email confirmation.

When a user sends an Email, they may not be aware that they are using the SMTP protocol unwittingly. Nowadays, with the development of technology, email sending and receiving has been simplified. Even users with Internet access can easily send and receive Emails using Web-based email services.

Examples of web-based email services are Microsoft’s Outlook Service and Google’s Gmail services.

However, a computer user can set up an Email Mail program to your computer and control all email traffic from a single location.

Example Image of Windows 10 Email Settings

For example, you can see the Email Mail program that comes with Windows 10 in the image below. In this view, multiple Email accounts are controlled and managed.

What is SMTP Protocol in Networking?

For example, to use SMTP, you can see the MAIL SERVER SMTP setting used to send Email in the following image. We can name it SMTP Outgoing. In short, it is used to send SMTP Email.

The incoming part sets up a MAIL SERVER address which is required for email retrieval.

What is SMTP Protocol in Networking?

From the images above we can better understand the power of using SMTP.

SMTP Server Security

SMTP Server security is a very important step. If the necessary security settings for SMTP is not configured, malicious people may send fake Emails in your name.

In general, SMTP, POP3 and IMAP inbound and outbound server settings are provided by the hosting company. If the hosting provider does not provide SMTP (25) port security, this will be a very critical situation for you.

If there is the vulnerability for SMTP 25, you can send E-mail with a few commands by connecting to SMTP Server via Telnet from CMD command prompt. If this situation is not closed by the hosting service provider, it can have bad consequences for you.

  Final Word

What is SMTP Protocol in Networking? – In this article, we have briefly talked about what SMTP is and what it does. In addition, we have provided an example of using SMTP on the Windows 10 operating system. Finally, we have briefly talked about what should be done in this regard by providing brief information on SMTP security.

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