Difference between revisions of "E-mail"

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E-mail

Electronic mail, often abbreviated as email, e.mail or e-mail, is a method of exchanging digital messages. E-mail systems are based on a store-and-forward model in which e-mail computer server systems accept, forward, deliver and store messages on behalf of users, who only need to connect to the e-mail infrastructure, typically an e-mail server, with a network-enabled device (e.g., a personal computer) for the duration of message submission or retrieval. Originally, e-mail was always transmitted directly from one user's device to another's; nowadays this is rarely the case.

An electronic mail message consists of two components, the message header, and the message body, which is the email's content. The message header contains control information, including, minimally, an originator's email address and one or more recipient addresses. Usually additional information is added, such as a subject header field.

Originally a text-only communications medium, email was extended to carry multi-media content attachments, which were standardized in with RFC 2045 through RFC 2049, collectively called, Multipurpose Internet Mail Extensions (MIME).

The foundation for today's global Internet e-mail service was created in the early ARPANET and standards for encoding of messages were proposed as early as 1973 (RFC 561). An e-mail sent in the early 1970s looked very similar to one sent on the Internet today. Conversion from the ARPANET to the Internet in the early 1980s produced the core of the current service.

Network-based email was initially exchanged on the ARPANET in extensions to the File Transfer Protocol (FTP), but is today carried by the Simple Mail Transfer Protocol (SMTP), first published as Internet standard 10 (RFC 821) in 1982. In the process of transporting email messages between systems, SMTP communicates delivery parameters using a message envelope separately from the message (headers and body) itself.

Source: "E-mail." Wikipedia, The Free Encyclopedia. 10 Dec 2009, 05:29 UTC. 13 Dec 2009 <http://en.wikipedia.org/w/index.php?title=E-mail&oldid=330809487>.

Spam E-mail

Spam e-mail is unsolicited (not asked for) commercial e-mail often sent to numerous people.

Ham E-mail

A valid and wanted e-mail message sent from your family, friends, membership organizations and or business connections.

False Positive E-mail

A valid and wanted e-mail message that was erroneously classified as a spam e-mail message.

False Negative E-mail

A spam e-mail message that was erroneously classified as a valid and wanted e-mail message.

References

• "E-mail." Wikipedia, The Free Encyclopedia. 10 Dec 2009, 05:29 UTC. 13 Dec 2009 <http://en.wikipedia.org/w/index.php?title=E-mail&oldid=330809487>.

• "Learning Spam and Ham." Guardian Digital, Inc.09 July 2004, 05:29 UTC. 13 Dec 2009 <http://infocenter.guardiandigital.com/manuals/SecureMail/node80.html>.