Chapter-27-Electronic mail -servers

Chia sẻ: Vinh Nghi | Ngày: | Loại File: PDF | Số trang:16

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Chapter-27-Electronic mail -servers

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They relay mail. Consider the case where a sending MTA can’t reach the destination MTA and chooses an alternative. The alternative MTA is called a relay, and it must be prepared to deliver the mail to the final recipient at a later time. Until a few years ago, MTAs performed relaying by default, but the advent of spam has changed that radically.

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