Simple Mail Transfer Protocol (SMTP) is an Internet standard forelectronic mail (e-mail) transmission across Internet Protocol (IP) networks.
SMTP was first defined by RFC 821 (1982, eventually declared STD10) and last updated by RFC 5321 (2008) which includes theExtended SMTP (ESMTP) additions, and is the protocol in widespread use today. It is an Application Layer protocol in the OSI reference model.
While electronic mail servers and other mail transfer agents use SMTP to send and receive mail messages, user-level client mail applications typically use SMTP only for sending messages to a mail server for relaying.
SMTP was first defined by RFC 821 (1982, eventually declared STD10) and last updated by RFC 5321 (2008) which includes theExtended SMTP (ESMTP) additions, and is the protocol in widespread use today. It is an Application Layer protocol in the OSI reference model.
While electronic mail servers and other mail transfer agents use SMTP to send and receive mail messages, user-level client mail applications typically use SMTP only for sending messages to a mail server for relaying.
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