SMTP is an acronym for Simple Mail Transfer Protocol.Simple Mail Transfer Protocol (SMTP) is a lot of correspondence rules/protocols that permit to transmission an electronic mail over the web. It is a protocol utilized for sending messages to other PC clients dependent on email addresses.The network-based e-mail was initially exchanged on the ARPANET (Advanced Research Projects Agency) in extensions to the FTP( A set of guidelines or standards that establish the format in which files can be transmitted from one computer to another), but it is now carried by the SMTP.There are no protocols in computer networking with the name of Simple Mail Transport Protocol, Simple Mail Terminal Protocol, and Simple Mail Transition Protocol.Hence, SMTP is Simple Mail Transfer Protocol.