SMTP maintains only delivery to the mail-gateway host, not to the actual destination host, located beyond the TCP/IP network. Unlike the store and the forward principle that provides the mail content to the destination host through several intermediary nodes in the same network, SMTP continues the mail content being sent until it has been successfully copied to its SMTP. SMTP is an end-to-end delivery in which an SMTP client machine contacts the destination host's SMTP server directly to deliver this mail. For example, if the recipient address is wrong, then receiving a server reply with an error message of some kind. ![]() They also have a way of handling errors such as incorrect email address. The servers have a way of recognizing themselves and announcing what kind of communication they are trying to perform. The main objective of SMTP is used to set up communication rules between servers. ![]() SMTP is a set of interaction guidelines that allow the software to transmit electronic mail over the internet, referred to as Simple Mail Transfer Protocol. ![]() ![]() SMTP represents Simple Mail Transfer Protocol.
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