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  2. SMTP Authentication - Wikipedia

    en.wikipedia.org/wiki/SMTP_Authentication

    SMTP Authentication, often abbreviated SMTP AUTH, is an extension of the Simple Mail Transfer Protocol (SMTP) whereby a client may log in using any authentication mechanism supported by the server. It is mainly used by submission servers, where authentication is mandatory.

  3. Simple Mail Transfer Protocol - Wikipedia

    en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol

    A typical example of sending a message via SMTP to two mailboxes (alice and theboss) located in the same mail domain (example.com) is reproduced in the following session exchange. (In this example, the conversation parts are prefixed with S: and C: , for server and client , respectively; these labels are not part of the exchange.)

  4. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    C: This is a test message with 5 header fields and 4 lines in the message body. C: Your friend, C: Bob C: . S: 250 Ok: queued as 12345 C: QUIT S: 221 Bye {The server closes the connection} And below is an example of an SMTP connection in which the SMTP Server supports the Enhanced Status Code, taken from RFC 2034:

  5. Telnet - Wikipedia

    en.wikipedia.org/wiki/Telnet

    Even though Telnet was an ad hoc protocol with no official definition until March 5, 1973, [12] the name actually referred to Teletype Over Network Protocol as the RFC 206 (NIC 7176) on Telnet makes the connection clear: [13] The TELNET protocol is based upon the notion of a virtual teletype, employing a 7-bit ASCII character set. The primary ...

  6. Open mail relay - Wikipedia

    en.wikipedia.org/wiki/Open_mail_relay

    Until the 1990s, mail servers were commonly intentionally configured as open relays; in fact, this was frequently the installation default setting. [1] The traditional store and forward method of relaying e-mail to its destination required that it was passed from computer to computer (through and beyond the Internet) via modems on telephone lines.

  7. Comparison of mail servers - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_mail_servers

    The comparison of mail servers covers mail transfer agents (MTAs), mail delivery agents, and other computer software that provide e-mail services.. Unix-based mail servers are built using a number of components because a Unix-style environment is, by default, a toolbox [1] operating system.

  8. Sender Policy Framework - Wikipedia

    en.wikipedia.org/wiki/Sender_Policy_Framework

    Sender Policy Framework (SPF) is an email authentication method that ensures the sending mail server is authorized to originate mail from the email sender's domain. [1] [2] This authentication only applies to the email sender listed in the "envelope from" field during the initial SMTP connection.

  9. Transmission Control Protocol - Wikipedia

    en.wikipedia.org/wiki/Transmission_Control_Protocol

    Some examples include: FTP (20 and 21), SSH (22), TELNET (23), SMTP (25), HTTP over SSL/TLS (443), and HTTP (80). [ e ] Registered ports are typically used by end-user applications as ephemeral source ports when contacting servers, but they can also identify named services that have been registered by a third party.