SMTP - meaning and definition. What is SMTP
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What (who) is SMTP - definition

INTERNET PROTOCOL USED FOR RELAYING E-MAILS
SMTP; Simple mail transport protocol; Simple mail transfer protocol; ESMTP; ETRN; Extended SMTP; EHLO; SMTP extension; Smtp; 8BITMIME; SMTP greeting; Smtp greeting; Esmtp; Mail protocol; Bsmtp; SMTP server; Smtp server; SMTP protocol; Port 587; Mail Transfer Protocol; E-mail structure; Mail stop code; Secure SMTP; Port 25; ASMTP; RFC 821; RFC 2821; Simple Mail Transport Protocol; RFC2821; RFC 5321; TCP port 25; SMTPUTF8; SMTP MTA Strict Transport Security; MTA-STS

SMTP         
SMTP         
¦ abbreviation Simple Mail Transfer (or Transport) Protocol, a standard for the transmission of electronic mail on a computer network.
SMTP         
Simple Mail Transfer Protocol (Reference: RFC 821, TCP/IP)

Wikipedia

Simple Mail Transfer Protocol

The Simple Mail Transfer Protocol (SMTP) is an Internet standard communication protocol for electronic mail transmission. Mail servers and other message transfer agents use SMTP to send and receive mail messages. User-level email clients typically use SMTP only for sending messages to a mail server for relaying, and typically submit outgoing email to the mail server on port 587 or 465 per RFC 8314. For retrieving messages, IMAP (which replaced the older POP3) is standard, but proprietary servers also often implement proprietary protocols, e.g., Exchange ActiveSync.

SMTP's origins began in 1980, building on concepts implemented on the ARPANET since 1971. It has been updated, modified and extended multiple times. The protocol version in common use today has extensible structure with various extensions for authentication, encryption, binary data transfer, and internationalized email addresses. SMTP servers commonly use the Transmission Control Protocol on port number 25 (for plaintext) and 587 (for encrypted communications).