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Simple Mail Transfer Protocol
Tue, 2017-May-09 03:05 UTC
Length - 2:26
Welcome to popular Wiki of the Day where we read the summary of a popular Wikipedia page every day.
With 501,883 views on Monday, 08 May 2017 our article of the day is Simple Mail Transfer Protocol.
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. For retrieving messages, client applications usually use either IMAP or POP3.
SMTP communication between mail servers uses TCP port 25. Mail clients on the other hand, often submit the outgoing emails to a mail server on port 587. Despite being deprecated, mail providers sometimes still permit the use of nonstandard port 465 for this purpose.
SMTP connections secured by SSL, known as SMTPS, can be made using STARTTLS.
Although proprietary systems (such as Microsoft Exchange and IBM Notes) and webmail systems (such as Outlook.com, Gmail and Yahoo! Mail) use their own non-standard protocols to access mail box accounts on their own mail servers, all use SMTP when sending or receiving email from outside their own systems.
This recording reflects the Wikipedia text as of 03:05 UTC on Tuesday, 09 May 2017.
For the full current version of the article, go to http://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol.
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