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Simple Mail Transfer Protocol information


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).

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Simple Mail Transfer Protocol

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The Simple Mail Transfer Protocol (SMTP) is an Internet standard communication protocol for electronic mail transmission. Mail servers and other message...

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Local Mail Transfer Protocol

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The Local Mail Transfer Protocol (LMTP) is an alternative to (Extended) Simple Mail Transfer Protocol for situations where the receiving side does not...

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Message transfer agent

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computer to another using the Simple Mail Transfer Protocol. In some contexts, the alternative names mail server, mail exchanger, or MX host are used...

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Email

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became the world's largest selling email system. The Simple Mail Transfer Protocol (SMTP) protocol was implemented on the ARPANET in 1983. LAN email systems...

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SOAP

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application layer protocols, most often Hypertext Transfer Protocol (HTTP), although some legacy systems communicate over Simple Mail Transfer Protocol (SMTP),...

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Network News Transfer Protocol

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connected to local networks. The resulting protocol was NNTP, which resembled the Simple Mail Transfer Protocol (SMTP) but was tailored for exchanging newsgroup...

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Email address

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transmission of electronic mail from the author's computer and between mail hosts in the Internet uses the Simple Mail Transfer Protocol (SMTP), defined in RFC 5321...

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MIME

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standard protocols, such as the Simple Mail Transfer Protocol (SMTP), the Post Office Protocol (POP), and the Internet Message Access Protocol (IMAP)....

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Session Initiation Protocol

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is a text-based protocol, incorporating many elements of the Hypertext Transfer Protocol (HTTP) and the Simple Mail Transfer Protocol (SMTP). A call established...

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Email authentication

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of email submission and retrieval. In the early 1980s, when Simple Mail Transfer Protocol (SMTP) was designed, it provided for no real verification of...

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Application layer

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Message Block SMTP, Simple Mail Transfer Protocol SNTP, Simple Network Time Protocol SSH, Secure Shell SSMS, Secure SMS Messaging Protocol TCAP, Transaction...

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History of email

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became the world's largest selling email system. The Simple Mail Transfer Protocol (SMTP) protocol was implemented on the ARPANET in 1983. LAN email systems...

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Internet mail standard

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the following basic set: Simple Mail Transfer Protocol (SMTP) specifies the protocol (RFC 5321, see below) by which e-mail is transmitted RFC 5322 specifies...

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Fully qualified domain name

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hostnames are allowed by some protocols, including HTTP, but disallowed by others, such as the Simple Mail Transfer Protocol (SMTP). Mockapetris, Paul. Domain...

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Trivial File Transfer Protocol

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Trivial File Transfer Protocol (TFTP) is a simple lockstep File Transfer Protocol which allows a client to get a file from or put a file onto a remote...

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Internet Message Access Protocol

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Internet Message Access Protocol (IMAP) is an Internet standard protocol used by email clients to retrieve email messages from a mail server over a TCP/IP...

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List of SMTP server return codes

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This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made...

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SMTP Authentication

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Authentication, often abbreviated SMTP AUTH, is an extension of the Simple Mail Transfer Protocol (SMTP) whereby a client may log in using any authentication...

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Open mail relay

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open mail relay is a Simple Mail Transfer Protocol (SMTP) server configured in such a way that it allows anyone on the Internet to send e-mail through...

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Sender Rewriting Scheme

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format. Historically, all mail transfer agents (MTAs) added their host name to the reverse path. In the Simple Mail Transfer Protocol (SMTP) this reverse path...

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Message submission agent

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cooperates with a mail transfer agent (MTA) for delivery of the mail. It uses ESMTP, a variant of the Simple Mail Transfer Protocol (SMTP), as specified...

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Sendmail

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facility that supports many kinds of mail-transfer and delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over...

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Intranet strategies

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running on the internet protocol suite and using Internet protocols such as FTP, TCP/IP, HTML, and Simple Mail Transfer Protocol (SMTP). Intranets are generally...

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MX record

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Simple Mail Transfer Protocol RFC 7505 (2015), A "Null MX" No Service Resource Record for Domains That Accept No Mail Obsoletes: RFC 974 (1986), Mail...

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Banner grabbing

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are those used by Hyper Text Transfer Protocol (HTTP), File Transfer Protocol (FTP), and Simple Mail Transfer Protocol (SMTP); ports 80, 21, and 25 respectively...

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Mailbox provider

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by implementing Simple Mail Transfer Protocol (SMTP) and possibly providing access to messages through Internet Message Access Protocol (IMAP), the Post...

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Bounce message

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Mail (DKIM) Sender Rewriting Scheme (SRS) Simple Mail Transfer Protocol (SMTP) Variable envelope return path (VERP) RFC 5321 - Simple Mail Transfer Protocol...

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List of computing and IT abbreviations

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Multithreading SMTP—Simple Mail Transfer Protocol SNA—Systems Network Architecture SNMP—Simple Network Management Protocol SNTP—Simple Network Time Protocol SOA—Service-Oriented...

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