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Smart host
A smart host is a type of email message transfer agent that allows a Simple Mail Transfer Protocol (SMTP) server to route email to an intermediate mailserver rather than directly to the recipient's server. This smart host often requires authentication from the sender to verify that the sender has privileges to have mail forwarded through the smart host. This is an important distinction from an open mail relay that will forward mail from the sender without authentication. Common authentication techniques include SMTP Authentication and POP before SMTP.
==Use for backup mail (secondary MX) services==
When configured to be a backup mail server (not the primary MX record), a smart host configuration will accept mail on behalf of the primary mail server if it were to go offline. When the primary mail server comes back online, mail is subsequently delivered via the smart host.
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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