Simple Mail Transfer Protocol

Definition(s)

  • 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 the Extended SMTP additions by RFC 5321—which is the protocol in widespread use today.  1
  • (pronounced as separate letters) Short for Simple Mail Transfer Protocol, a protocol for sending e-mail messages between servers. Most e-mail systems that send mail over the Internet use SMTP to send messages from one server to another; the messages can then be retrieved with an e-mail client using either POP or IMAP. In addition, SMTP is generally used to send messages from a mail client to a mail server. This is why you need to specify both the POP or IMAP server and the SMTP server when you configure your e-mail application.  2

Notes

  1. Wikipedia, Simple Mail Transfer Protocol, https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol
  2. Webopedia, SMTP – Simple Mail Transfer Protocol definition, http://www.webopedia.com/TERM/S/SMTP.html
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