This link has been bookmarked by 51 people . It was first bookmarked on 25 Sep 2006, by Raghavendra Ugare.
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12 Mar 15
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02 Apr 14
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26 Mar 14
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HELO relay.example.org
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MAIL FROM
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C: DATA
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MAIL FROM
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originating email address
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05 Oct 13
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Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (e-mail) transmission across Internet Protocol (IP) networks.
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While 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 receiving messages, client applications usually use either the Post Office Protocol (POP) or the Internet Message Access Protocol (IMAP)
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01 Aug 13
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From: "Bob Example" <bob@example.org> C: To: "Alice Example" <alice@example.com> C: Cc: theboss@example.com C: Date: Tue, 15 January 2008 16:02:43 -0500 C: Subject: Test message
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20 May 13
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Simple Mail Transfer Protocol (SMTP)
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Internet Protocol (IP) networks
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use SMTP to send and receive mail messages
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09 Mar 13
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SMTP is a connection-oriented, text-based protocol in which a mail sender communicates with a mail receiver by issuing command strings and supplying necessary data over a reliable ordered data stream channel, typically a Transmission Control Protocol (TCP) connection. An SMTP session consists of commands originated by an SMTP client (the initiating agent, sender, or transmitter) and corresponding responses from the SMTP server (the listening agent, or receiver) so that the session is opened, and session parameters are exchanged. A session may include zero or more SMTP transactions. An SMTP transaction consists of three command/reply sequ
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28 Jan 13
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17 Jan 13
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28 Aug 12
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(e-mail) tra
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communicate
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ion con
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nsists of th
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20 Oct 11
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11 Sep 11
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The protocol for new submissions is effectively the same as SMTP, but it uses port 587 instead.
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The boundary MTA has to locate the target host. It uses the Domain name system (DNS) to look up the mail exchanger record (MX record) for the recipient's domain
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hands it to a mail delivery agent (MDA) for local mail delivery.
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SMTP defines message transport, not the message content. Thus, it defines the mail envelope and its parameters, such as the envelope sender, but not the header or the body of the message itself. STD 10 and RFC 5321 define SMTP (the envelope), while STD 11 and RFC 5322 define the message (header and body), formally referred to as the Internet Message Format.
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An SMTP server acting as client initiates a TCP connection to the server on the "well-known port" designated for SMTP: port 25. MUAs should use port 587 to connect to an MSA. The main difference between an MTA and an MSA is that SMTP Authentication is mandatory for the latter only.
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30 Jun 11
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While electronic mail servers and other mail transfer agents use SMTP to send and receive mail messages, user-level client mail applications typically only use SMTP for sending messages to a mail server for relaying. For receiving messages, client applications usually use either the Post Office Protocol (POP) or the Internet Message Access Protocol (IMAP) or a proprietary system
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30 Dec 10
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15 Apr 10
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29 Jan 09
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01 May 08
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09 Feb 08
Tomi HäsäSee: RFC 821, RFC 1123.
RFC standards protocols network internet standardit protokollat verkko netti
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25 Sep 06
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