Overview

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. High Quality Content by WIKIPEDIA articles! Push e-mail is used to describe e-mail systems that provide an always-on capability, in which new e-mail is actively transferred (pushed) as it arrives by the mail delivery agent (MDA) (commonly called mail server) to the mail user agent (MUA), also called the e-mail client. E-mail clients include smartphones and, less strictly, IMAP personal computer mail applications. Post Office Protocol (POP3) is an example of a polling email delivery protocol. At login and later at intervals, the Mail User Agent (client) polls the Mail Delivery Agent (server) to see if there is new mail, and if so downloads it to a mailbox on the user's computer. However, outgoing mail is generally pushed directly from the sender to the final Mail Delivery Agent. Extending this push to the last delivery step is what distinguishes push e-mail from polling e-mail systems.

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