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An email box (also email mailbox, e-mailbox) is the destination to which electronic mail messages are delivered. It is the equivalent of a letter box in the postal system. ==Definitions== A mailbox is identified by an email address. However, not all email addresses correspond to a storage facility. The term ''pseudo-mailbox'' is sometimes used to refer to an address that does not correspond to a definitive mail store. Email forwarding may be applied to reach end recipients from such addresses. Electronic mailing lists and email aliases are typical examples. RFC 5321,〔RFC 5321, ''Simple Mail Transfer Protocol'', J. Klensin, The Internet Society (October 2008), Section 2.3.11 (''Mailbox and Address'')〕 defines an ''email address'' as a character string that identifies a user to whom mail will be sent or a location into which mail will be deposited. The term ''mailbox'' refers to that depository. In that sense, the terms ''mailbox'' and ''address'' can be used interchangeably. RFC 5322 defines a mailbox as follows:〔RFC 5322, ''Internet Message Format'', P. Resnick (Ed.), The Internet Society (October 2008), Section 3.4 (''Address Specification'')〕 ''A mailbox receives mail. It is a 'conceptual entity' that does not necessarily pertain to file storage.'' It further exemplifies that some sites may choose to print mail on a printer and deliver the output to the addressee's desk, much like a traditional fax transmission. Access(詳細はmailbox provider. Usually, anyone can send messages to a mailbox while only authenticated users can read or delete them. An email client retrieves messages from one or more mailboxes. The database (file, directory, storage system) in which the client stores the messages is called the ''local mailbox''. Popular protocols to retrieve messages are: *Post Office Protocol: a client–server method that is most suitable for reading messages from a single client computer because message are removed from the server mailbox after first retrieval. *Internet Message Access Protocol: designed to retrieve messages from multiple clients by allowing remote management of the server mailbox by keeping master copies of messages on the server but can save a copy in the local mailbox. Web-based clients exist that retrieve messages from the server on behalf of the website user and display them to the user in a suitable form for text messages that are sent between computer users, within the framework of "electronic mail" messages. This specification is a revision of Request For Comments (RFC) 2822, which itself superseded Request For Comments (RFC) 822, "Standard for the Format of ARPA Internet Text Messages", updating it to reflect current practice and incorporating incremental changes that were specified in other RFCs. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Email box」の詳細全文を読む スポンサード リンク
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