SMTP stands for Simple Mail Transfer Protocol. The SMTP protocol is used in the TCP/IP based networks for transferring mail messages between user computers. Most popular freeware for Unix based SMTP mail programs are Elm and Pine. The Microsoft Outlook that comes with the Windows operating system also uses SMTP to transfer messages and is very popular.
The most notable aspect is that the SMTP works only when both the mail sender and receiver are ready to transact at the same time. Suppose that the receiver computer is not connected or available at the moment, then the messages are stored in a temporary server. A post office protocol must then be used to retrieve the mail.
It should be clear that two separate protocols are used for sending and receiving email. For sending messages, the SMTP is used whereas for receiving at the order and either POP or IMAP is used at their local server. While configuring the email accounts, certain addresses are exclusively declared viz. the addresses of an SMTP server, a POP server, address where returned messages are to be sent and the basic server where the user has his email account.
There are two main difficulties using the SMTP protocol, i.e. the message of size more than 64 KB cannot be handled and the second is the timeout. Whereas the first problem could be overcome with never implementations of the operating systems as well as attaching files as attachments to the main messages. The second problem continued as both the client and server can have different timeouts and quite naturally. One of them may timeout very quickly keeping the other busy or unexpectedly terminate the connection.
The most notable aspect is that the SMTP works only when both the mail sender and receiver are ready to transact at the same time. Suppose that the receiver computer is not connected or available at the moment, then the messages are stored in a temporary server. A post office protocol must then be used to retrieve the mail.
It should be clear that two separate protocols are used for sending and receiving email. For sending messages, the SMTP is used whereas for receiving at the order and either POP or IMAP is used at their local server. While configuring the email accounts, certain addresses are exclusively declared viz. the addresses of an SMTP server, a POP server, address where returned messages are to be sent and the basic server where the user has his email account.
There are two main difficulties using the SMTP protocol, i.e. the message of size more than 64 KB cannot be handled and the second is the timeout. Whereas the first problem could be overcome with never implementations of the operating systems as well as attaching files as attachments to the main messages. The second problem continued as both the client and server can have different timeouts and quite naturally. One of them may timeout very quickly keeping the other busy or unexpectedly terminate the connection.
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