smtp is the protocol used to send email messages from a mail client to a mail server.
smtp is the protocol used to send email messages from a mail client to a mail server.
which protocol is used to send email messages from a mail client to a mail server?
smtp
an example for the use of ports is the internet mail system. a server used for sending and receiving email generally needs two services. the first service is used to transport email to and from other servers. this is accomplished with the simple mail transfer protocol (smtp). the smtp service application usually listens on tcp port 25 for incoming requests. the second service is usually either the post office protocol (pop) or the internet message access protocol (imap) which is used by e-mail client applications on users' personal computers to fetch email messages from the server. the pop service listens on tcp port number 110. both services may be running on the same host computer, in which case the port number distinguishes the service that was requested by a remote computer, be it a user's computer or another mail server.
port (computer networking)
email messages are composed, delivered, and stored in a multiple step process, which starts with the message's composition. when the user finishes composing the message and sends it, the message is transformed into a standard format: an rfc 2822 formatted message. afterwards, the message can be transmitted. using a network connection, the mail client, referred to as a mail user agent (mua), connects to a mail transfer agent (mta) operating on the mail server. the mail client then provides the sender’s identity to the server. next, using the mail server commands, the client sends the recipient list to the mail server. the client then supplies the message. once the mail server receives and processes the message, several events occur: recipient server identification, connection establishment, and message transmission. using domain name system (dns) services, the sender’s mail server determines the mail server(s) for the recipient(s). then, the server opens up a connection(s) to the recipient mail server(s) and sends the message employing a process similar to that used by the originating client, delivering the message to the recipient(s).
internet security