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Advanced Linux Networking by Roderick W. Smith

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Chapter 19. Push Mail Protocol: SMTP

Chapter 11, Pull Mail Protocols: POP and IMAP, covered servers that dealt with part of the task of mail delivery. POP, IMAP, and other pull mail protocols allow end users to retrieve their e-mail from a central mail server system. There are two other aspects of mail delivery, though: delivering the mail to the central mail server, and sending outgoing mail. As it happens, both these tasks are handled by push mail protocols, so called because the sender initiates push mail transfers. The relationship between push and pull mail protocols is covered in the “Pull Mail's Place in the Mail Delivery System” section of Chapter 11.

The most common push mail protocol in 2002 is the Simple Mail Transfer Protocol (SMTP ...

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