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SMTP, aka Simple Mail Transfer Protocol, is a protocol created in 1982.

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Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (email) transmission. First defined by RFC 821 in 1982, it was last updated in 2008 with Extended SMTP additions by RFC 5321, which is the protocol in widespread use today. Although 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. Read more on Wikipedia...

Example from Wikipedia:
S: 220 ESMTP Postfix C: EHLO S: Hello [] S: 250-SIZE 14680064 S: 250-PIPELINING S: 250 HELP

Books about SMTP on goodreads

title author year reviews ratings rating
Programmer's Guide to Internet Mail: Smtp, Pop, Imap, and LDAP John Rhoton 1999 1 6 4.00

Publications about SMTP from Semantic Scholar

title authors year citations influentialCitations
E-Mail Client Multiplatform for the Transfer of Information Using the SMTP Java Protocol Without Access to a Browser Liliana Enciso and Ruben Baez and Alvaro Maldonado and Elmer Zelaya-Policarpo and P. Quezada-Sarmiento 2018 5 0
xquery.html 路 smtp.html 路 scratch.html

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