RFC 821 - определение. Что такое RFC 821
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  • этимология

Что (кто) такое RFC 821 - определение

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

RFC 821         
<messaging, standard> The original RFC defining SMTP. Updated by RFC 2821. rfc:821">rfc:821. (2007-06-01)
IAR-821         
AGRICULTURAL AIRCRAFT
ICA-Brasov IAR-821; I.A.R.-821; IAR 821
The IAR-821 was an agricultural aircraft built in Romania in the 1960s. It was a conventional low-wing monoplane with fixed, tailwheel undercarriage.
Socimi Type 821         
SUBMACHINE GUN
Socimi 821
The Socimi Type 821-SMG was a submachine gun manufactured in the 1980s by the firm of SOCIMI, Società Costruzioni Industriali Milano, SpA located in Milan, Italy.

Википедия

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).