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What is an SMTP Server?

Ask anyone ‘What does SMTP mean?’ and the first thing that pops to their mind is ‘Simple Mail Transfer Protocol’. Let’s go beyond the proverbial definition and understand what exactly is SMTP and SMTP Server, and why we need it.

Definition - What does Simple Mail Transfer Protocol (SMTP) mean?

Simple Mail Transfer Protocol (SMTP) is the standard protocol for email services on a TCP/IP network. SMTP provides the ability to send and receive email messages.

SMTP is an application-layer protocol that enables the transmission and delivery of email over the Internet. SMTP is created and maintained by the Internet Engineering Task Force (IETF).

Simple Mail Transfer Protocol is also known as RFC 821 and RFC 2821.

SMTP is one of the most common and popular protocols for email communication over the Internet and it provides intermediary network services between the remote email provider or organizational email server and the local user accessing it.

SMTP is generally integrated within an email client application and is composed of four key components:

Local user or client-end utility known as the mail user agent (MUA)

Server known as mail submission agent (MSA)

Mail transfer agent (MTA)

Mail delivery agent (MDA)

SMTP works by initiating a session between the user and server, whereas MTA and MDA provide domain searching and local delivery services...go to - techopedia.com to read more.

History

Various forms of one-to-one electronic messaging were used in the 1960s. Users communicated using systems developed for specific mainframe computers. As more computers were interconnected, especially in the U.S. Government's ARPANET, standards were developed to permit exchange of messages between different operating systems. SMTP grew out of these standards developed during the 1970s...more info at - wikipedia.org.

The SMTP Model

The SMTP design is based on the following model of communication: as the result of a user mail request, the sender-SMTP establishes a two-way transmission channel to a receiver-SMTP. The receiver-SMTP may be either the ultimate destination or an intermediate. SMTP commands are generated by the sender-SMTP and sent to the receiver-SMTP. SMTP replies are sent from the receiver-SMTP to the sender-SMTP in response to the commands.

Once the transmission channel is established, the SMTP-sender sends a MAIL command indicating the sender of the mail. If the SMTP-receiver can accept mail it responds with an OK reply. The SMTP-sender then sends a RCPT command identifying a recipient of the mail. If the SMTP-receiver can accept mail for that recipient it responds with an OK reply; if not, it responds with a reply rejecting that recipient (but not the whole mail transaction). The SMTP-sender and SMTP-receiver may negotiate several recipients. When the recipients have been negotiated the SMTP-sender sends the mail data, terminating with a special sequence. If the SMTP-receiver successfully processes the mail data it responds with an OK reply. The dialog is purposely lock-step, one-at-a-time...more at - freesoft.org/.

How Email Clients are Handled

Many people use web-based email clients, like Yahoo Mail and Gmail. Those who require a lot more space - especially businesses - often have to invest in their own servers. That means that they also have to have a way of receiving and transmitting emails, which means that they need to set up their own mail servers. To that end, programs like Postfix and Microsoft Exchange are two of the most popular options. Such programs facilitate the preceding process behind the scenes. Those who send and receive messages across those mail servers, of course, generally only see the "send" and "receive" parts of the process.

Conclusion

 Secure SMTP service gives its members more possibilities than a standard SMTP server does. Fast, responsive, and quick loading, the SMTP server engine allows sending e-mail through SSL / TLS encrypted channels, provides detailed reports available for preview in the Control Panel, and enhanced delivery notifications.

A good outbound smtp service gives its members more possibilities than a standard oSMTP server does. They give a fast and responsive server which sends emails through encrypted channels and high deliverability.