ANSWERS: 1
  • Simple Mail Transfer Protocol (SMTP) is the process by which emails are sent to the designated receiver. The fact a machine is considered an SMTP server is only determined by the software installed on it.

    Definition

    SMTP stands for Simple Mail Transport Protocol. This protocol uses port 25 to send and receive communications with other mail servers. The user's client program will connect to the user's provider server to send the email from the client to the server. The server then transfers the message to the intended recipient server which handles routing to the recipient's inbox.

    Using SMTP Service

    The SMTP is used for sending messages from their client (the program you use to send/receive email). Your client will connect with your provider's SMTP server to deliver the message. The server then sends the message to the designated recipient server which receives the message via port 25.

    Components of an SMTP server

    An SMTP server contains server hardware, mail server software and network connection. The SMTP server does not require access to the internet but does require access to the local network.

    History

    The technical specifications for SMTP servers were written by Jonathan B. Postel in August 1982. The simple objective of the protocol is to "transfer mail reliably and efficiently."

    Simple Breakdown

    The SMTP process of sending mail can easily be broken down into three actions: Initiate communication from sending server, receive receipt of communication from receiving server and send data to receiving server.

    Source:

    RFC 821: Simple Mail Transfer Protocol

    RFC 1730: Internet Message Access Protocol

    RFC 918: Post Office Protocol

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