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Mailbox provider
Mailbox provider, mail service provider or email service provider is a department or organization that provides email hosting. It provides email servers to send, receive, accept, and store email for other organizations and/or end users, on their behalf and upon their explicit mandate.
The term "mail service provider" was coined in the Internet Mail Architecture document RFC 5598.
== Types ==
There are various kinds of email providers. There are paid and free ones, possibly sustained by advertising. Some allow anonymous users, whereby a single user can get multiple, apparently unrelated accounts. Some require full identification credentials; for example, a company may provide email accounts to full-time staff only. Often, companies, universities, organizations, groups, and individuals that manage their mail servers themselves adopt naming conventions that make it straightforward to identify who is the owner of a given email address. Besides control of the local names, insourcing may provide for data confidentiality, network traffic optimization, and fun.
Mailbox providers typically accomplish their task by implementing Simple Mail Transfer Protocol (SMTP) and possibly providing access to messages through Internet Message Access Protocol (IMAP), the Post Office Protocol, Webmail, or a proprietary protocol. Parts of the task can still be outsourced, for example virus and spam filtering of incoming mail, or authentication of outgoing mail.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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