Simple Mail Transfer Protocol.
The simple Mail Transfer Protocol (SMTP) is technical standard for transmitting electronic mail (e-mail) over a network. It allows computers and servers to exchange data regardless of their underlying hardware or software. It as well standardises the way e-mail travels from sender to recepient, making widespread e-mail delivery possible.
SMTP can be used for various purposes such as defining a process for exchanging data.SMTP delivers an e-mail to an e-mail provider’s mail server but separate protocols are used to retrieve that e-mail from the mail server so the recepient can read it.
SMTP defines a process for exchanging data.It provides a secure environment for sending e-mails. Act as a relay for out outgoing mails between an e-mail sender and an e-mail receiver. It also allows users to log on as a remote host as well as providing access to global information about various services.
In organisation , SMTP can be used to communicate between different organisations. That is, it used to send and receive e-mails and it is sometimes paired with IMAP or POP3.
The SMTP is an application layer protocol therefore functions at the Application layer. The Application layer ensures an application can effectively communicate with other applications on different computer systems and networks.The application layer is as well the top most layer in the Open System Interconnection (OSI) model. This layer also provides several ways for manipulating data or information which enables any type of user to access network easier. It as well makes a request to its bottom layer(presentation layer) for receiving various types of information from it. It can also be used to serve as a window for users and application processes to access network services.
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