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The Internet Message Access Protocol (IMAP) provides support for polling and notifications.
Although push email had existed in wired-based systems for many years, one of the first uses of the system with a portable, "always on" wireless device outside Asia was the Black Berry service from Research In Motion.Outgoing mail is generally pushed from the sender to the final mail delivery agent (and possibly via intermediate mail servers) using Simple Mail Transfer Protocol.If the receiver uses a polling email delivery protocol, the final step from the last mail delivery agent to the client is done using a poll.Push email is an email system that provides an always-on capability, in which new email 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 email client.Email clients include smartphones and, less strictly, IMAP personal computer mail applications.When "Push" is configured, emails arriving into the Microsoft Exchange inbox are instantly pushed to the device.
Calendar events sync both ways between Exchange and the device.
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.
Android's built-in Gmail client uses Google Cloud Messaging to push email for Gmail accounts set up to sync with the phone.
Android also supports Microsoft Exchange accounts natively through its default mail application.
Numerous Yahoo users have complained that push does not function reliably; Yahoo has attributed this to server issues rather than the Smartphone app.