Hello Friends, In this blog post I am going to let you know about the SMTP server, What is the SMTP server and how do they work in the network with email?
SMTP stands for the simple mail transfer protocol. SMTP is one of the most common uses of networks is electronic mail, the ability to send a message or file to a specific user at a local or remote site.
Typically, you send a message by specifying the email address of the recipient. The usual address format is name@host-text-address. The message is buffered at the destination site and is accessible only by the intended user.
In addition to the message formats, the TCP/IP protocol suite specifies a standard for the exchange of mail between machines. That is, the standard specifies the exact format of messages a client on the machine uses to transfer mail to a server on another.
The standard transfer protocol is known as a simple mail transfer protocol. The SMTP protocol focuses specifically on how the underlying mail delivery system passes messages across the internet from one machine to another.
It does not specify how the mail system accepts mail from a user interface that presents the user with incoming mail. SMTP does not specify how mail is stored or how frequently the mail system attempts to send a message.
Fig 1 shows the interaction between local mail SMTP, and TCP, when a user sends mail, the local mail facility determines whether the address is local or requires a connection to a remote site.
In the latter case, the local mail facility stores the mail, where it waits for the client SMTP. When the client SMTP delivers the mail, it first calls TCP to establish a connection with the remote site.
When the connection is made, the client and server SMTPs exchange packets and eventually deliver the mail. At the remote end, the local mail facility gets the mail and delivers it to the intended recipient.
There are four parameters in the SMTP protocol.
To send mail the user through the US(user agent) creates mail that looks very similar to postal mail. It has an envelope and a message.
The envelope generally contains the sender address, the receiver address, and other information.
The message contains the headers and the body. The headers define the sender, the receiver, the subject of the message, and some other information. The body contains the actual information to be read by the recipient.
The user agent periodically checks the mailboxes. If a user has mail, the UA informs the user first by giving notice. If the user is ready to read the mail, a list is displayed in which each line contains a summary of information about a particular message in the mailbox.
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