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Believe or not, I developed an application in Delphi for sending email and this article was really helpful to explain the app’s user how email really works. The interaction between the SMTP client and the SMTP server mentioned in the first step of the SMTP procedure represents the actual SMTP session. SMTP was first defined in RFC 788 in 1981. She wants to fetch and read messages already stored in her yahoo mailbox. SIR THANKS FOR EXPLAINING IN SUCH A WONDERFUL WAY. 2- The Mail app starts communicating with Bob’s mail server and eventually push the email that Bob composed to Bob’s mail server where it is stored to be delivered later to Alice@yahoo.com. Notes: Incoming and outgoing server details are the same. SMTP works hand in hand with MTA (Mail Transfer Agent). The function of POP3 is to allow an email client to download an email from an email server. Needless to say, these are not the only ways to interact with your mail servers from the user agents. . In 2001, major revisions of RFC 821 and 822 were released as RFC 2821 (SMTP) and RFC 2822 (Internet Message Format). How does the email end up at your friend’s mailbox? When you send an email via SMTP… For Alice though it’s different. The receiver will the acknowledge each Here is where you should look. E-mail is one of the most widely used application services in internet and widely used in business activities. SMTP. Among other things, the SMTP server checks if the user “Alice” exists and if yes, it sends back a 250 acknowledgement indicating that it’s OK with accepting messages from Bob to be delivered to Alice. If you use a Webmail like gmail or hotmail, it is transparent. SMTP spells out and directs how your email moves from your computer's MTA to an MTA on another computer, and even several computers. The recipient’s MTA then forwards the email on to the incoming mail server (MDA, mail … with a 250 OK, or an appropriate error message if anything went wrong. RCPT command by sending 250 OK or by sending the error message 550 No such user An SMTP relay guarantees that an email you send arrives in the recipient’s … If you feel adventurous and you want to actually read the specifications of the protocol, the original specifications for SMTP were published under RFC 821 in 1982. Can the source site of the SMTP message be determined? If Bob wants to send an email message, he composes the message on his user agent, and then pushes it to his mail server to be delivered to the right recipient. In fact nowadays, our user agents are often times our browsers (we go to yahoo.com or gmail.com from our browsers to send/read our emails). Great job! SMTP Authentication is the mechanism by which the clients of an ISP identify themselves to the mail server through which send their email. SMTP is the Application Level protocol that handles message services over TCP/IP networks. When the client sends a “.” to the server, this indicates that the client is done with sending the email message. The SMTP stands for Simple Mail Transfer Protocol. (previous receiver) can now send messages by issuing a MAIL command. After the sending is completed, the client can follow any of these actions. Simple Mail Transfer Protocol (SMTP) is based on end-to-end message delivery. You probably heard of them before: POP and IMAP. Long life to you, Thank you. SMTP stands for Simple Mail Transfer Protocol. However it should be noted that the POP3 protocol is basic and does … In our scenario, we know that Bob used his user agent to push his email message to his mail server. SMTP grew out of these standards developed during the 1970s. First, let’s lay down all the participating players in the process: This is the application running on Bob’s laptop that he uses to compose, reply to, and read his email messages. The SMTP server is always on listening mode. When you send an email, your SMTP server is configured in your email client. I am working in the mail domain but did not know that much you explained. The diagram down below describes the path that email takes from your computer to the … Each time you send an email to a full email address, it’s transferred via several SMTP … . This machine is also in charge of sending email messages sent from Bob to other users on other mail servers. As soon as it listens for a TCP connection from any client, the SMTP … When a message arrives, the POP3 server simply appends it to the bottom of … Using that "store and forward" feature mentioned … 3- Bob’s mail server sees that there is a message pending delivery to Alice@yahoo.com. 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