What is Simple Mail Transfer Protocol(SMTP)?
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As the technology behind email communication, SMTP is the protocol that allows you to send and receive emails. Without it, email communication would be nonexistent since SMTP determines which servers will receive your relay messages.
S = Simple: SMTP is designed to be straightforward and easy to implement.
M = Mail: SMTP is built to send email messages across networks.
T = Transfer: SMTP is responsible for transferring email messages from one server to another.
P = Protocol: SMTP is a set of rules (or protocols) that lets different email systems and servers communicate with each other.
As the “T” in its name indicates, SMTP is a transport protocol: All it does is move messages from point A to point B.Like many other Internet protocols, SMTP is intended to be used on top of the Transmission Control Protocol (TCP), which guarantees reliable delivery of the individual packets that make up a conversation.The use of IP means that we can depend on SMTP to eventually get the message contents to a server, but what happens to it after that is up to the server.