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Simple Mail Transfer Protocol (SMTP) is the standard protocol for email services on a TCP/IP network. SMTP provides the ability to send and receive email messages.
SMTP is an application-layer protocol that enables the transmission and delivery of email over the Internet. SMTP is created and maintained by the Internet Engineering Task Force (IETF).
Simple Mail Transfer Protocol is also known as RFC 821 and RFC 2821.
SMTP is one of the most common and popular protocols for email communication over the Internet and it provides intermediary network services between the remote email provider or organizational email server and the local user accessing it.
SMTP is generally integrated within an email client application and is composed of four key components:
SMTP works by initiating a session between the user and server, whereas MTA and MDA provide domain searching and local delivery services.
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